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  <doc>
    <id>30898</id>
    <completedYear/>
    <publishedYear>2014</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst>26</pageFirst>
    <pageLast>32</pageLast>
    <pageNumber/>
    <edition/>
    <issue>Suppl. 1 (Erneuerbare Energien)</issue>
    <volume>83</volume>
    <type>article</type>
    <publisherName>Ernst</publisherName>
    <publisherPlace>Berlin</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Großmaßstäblicher Versuchsstand für zyklisch axial belastete Pfähle</title>
    <abstract language="deu">Offshore-Pfähle in Mehrpfahlgründungsstrukturen wie Jacket-Gründungen müssen nach der Rammung überwiegend zyklisch axialen Belastungen widerstehen. Die Abmessungen der Pfähle werden sowohl von der inneren Tragfähigkeit und dem Ermüdungsverhalten des Stahlquerschnittes als auch von der äußeren Tragfähigkeit und der Pfahl-Boden-Interaktion bestimmt. Aufgrund der großen Zahl von Pfahlgründungen, die für aktuelle und zukünftige Windparkprojekte benötigt werden, besteht ein dringender Bedarf, die Dimensionierung und die damit verbundenen Kosten des Einzelpfahles zu optimieren. Bezüglich der Pfahltragfähigkeit sind wichtige aktuelle Forschungsthemen eine mögliche Traglaststeigerung durch Anwachsen und die geeignete Abschätzung der zyklischen Degradation. Zur Untersuchung beider Effekte wurde eine großmaßstäbliche Versuchsanlage auf dem Testgelände BAM TTS in Horstwalde nahe Berlin errichtet. Auf diesem Versuchsfeld können große Stahlrohrammpfähle zyklisch druck- und zugbelastet werden. Zudem kann die Untersuchung von Alterungseffekten durch zeitlichen Versatz zwischen den Messkampagnen untersucht werden. Erste Ergebnisse zeigen einen Anstieg der Pfahltragfähigkeit bis zu ca. 60 % nach einer Standzeit von ca. 18 Monaten. Für die Degradation der Tragfähigkeit der zyklisch belasteten Pfähle zeigen die ersten vorläufigen Ergebnisse ein zum Teil unerwartetes Verhalten. Zusätzliche Untersuchungen werden derzeit zur weiteren Abklärung durchgeführt.</abstract>
    <parentTitle language="deu">Stahlbau</parentTitle>
    <identifier type="old">33882</identifier>
    <identifier type="doi">10.1002/stab.201430005</identifier>
    <identifier type="issn">0038-9145</identifier>
    <identifier type="issn">1437-1049</identifier>
    <identifier type="issn">0932-6375</identifier>
    <enrichment key="date_peer_review">26.06.2014</enrichment>
    <author>Matthias Baeßler</author>
    <author>Werner Rücker</author>
    <author>Pablo Cuéllar</author>
    <author>Steven Georgi</author>
    <author>Krassimire Karabeliov</author>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Stahlpfahl, gerammt</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Offshore-Gründung</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Anwachsen</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Feldversuch</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Tragfähigkeit</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Rammung</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Offshore foundation</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Increase</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Field test</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Bearing capacitiy</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Driving Versuche - Experimental set-ups</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Berechnungs- und Bemessungsverfahren - Analysis and calculation</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Stahlhochbau - Steel buildings</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Mast- und Turmbau - Masts and towers</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Stahlwasserbau - Steel structures for hydraulic engineering</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Steel pile, driven in</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>25405</id>
    <completedYear/>
    <publishedYear>2012</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst>11</pageFirst>
    <pageLast>25</pageLast>
    <pageNumber/>
    <edition/>
    <issue>1</issue>
    <volume>14</volume>
    <type>article</type>
    <publisherName>Springer</publisherName>
    <publisherPlace>Berlin ; Heidelberg</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">On the quasi-static granular convective flow and sand densification around pile foundations under cyclic lateral loading</title>
    <abstract language="deu">The saturated sand surrounding an offshore pile
foundation under quasi-static cyclic lateral load can show the
physical phenomena of macromechanical densification and
convective granular flow. Based on the results from physical
model tests at different geometrical scales, this paper
provides a certain quantification of such phenomena and discusses
their causes and consequences. The progressive sand
densification leads to subsidence of the soil surface and a significant
stiffening of the pile behaviour. Conversely, the ratcheting
convective motion of two closed cells of soil beneath
the pile-head is responsible for an endless grain migration at
the soil surface, the inverse grading of the convected material
and a direct shear of the sand at the distinct boundary of the
revolving soil domain. In this respect, and from a macromechanical
perspective considering the soil as a continuum, it
appears that the convecting material tends to follow gradient
lines of shear stress during its ratcheting motion. Concluding
the paper, the practical relevance of these phenomena and
their extrapolation to other conditions are briefly discussed.</abstract>
    <parentTitle language="deu">Granular matter</parentTitle>
    <identifier type="old">28119</identifier>
    <identifier type="doi">10.1007/s10035-011-0305-0</identifier>
    <identifier type="issn">1434-5021</identifier>
    <identifier type="issn">1434-7636</identifier>
    <enrichment key="bibliotheksstandort">Sonderstandort: Publica-Schrank</enrichment>
    <enrichment key="date_peer_review">30.01.2012</enrichment>
    <author>Pablo Cuéllar</author>
    <author>Steven Georgi</author>
    <author>Matthias Baeßler</author>
    <author>Werner Rücker</author>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Offshore pile foundation</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Cyclic loading</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Ratcheting</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Granular convection</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Densification</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")</collection>
  </doc>
  <doc>
    <id>61165</id>
    <completedYear/>
    <publishedYear>2024</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>14</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>313</volume>
    <type>article</type>
    <publisherName>Elsevier B.V.</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Large-scale field tests on plastic pile tip failure upon monopile installation</title>
    <abstract language="eng">Large-diameter monopiles are the most common foundation structures for offshore wind turbines. One relevant failure mode during installation is plastic failure of the pile tip which may increase progressively during further driving (pile tip buckling; extrusion buckling). This paper presents the details and results of a large-scale field-test campaign with dynamic pile installation for the validation and calibration of different numerical approaches concerning pile-tip buckling phenomena. The phenomenology of observed pile-tip failures is here described in detail and a first quantitative approach is evaluated based on the field-test data. As the number of new projects continues to grow and the necessity to construct wind farms in challenging terrain increases, such field data-sets will become increasingly relevant.</abstract>
    <parentTitle language="eng">Ocean Engineering</parentTitle>
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    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="date_peer_review">21.10.2024</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Hagen Balscheit</author>
    <author>Peter Geißler</author>
    <author>Pablo Cuéllar</author>
    <author>Frank Basedau</author>
    <author>Matthias Baeßler</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Monopile</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Offshore Windenergy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Pfahlfußbeulen</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Pile Tip Buckling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Reference Tests</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">7 Bauwerkssicherheit</collection>
    <collection role="institutes" number="">7.2 Ingenieurbau</collection>
    <collection role="themenfelder" number="">Energie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <collection role="themenfelder" number="">Windenergie</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/61165/1-s2.0-S002980182402660X-main.pdf</file>
  </doc>
  <doc>
    <id>58364</id>
    <completedYear/>
    <publishedYear>2023</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1729</pageFirst>
    <pageLast>1734</pageLast>
    <pageNumber/>
    <edition/>
    <issue>3-4</issue>
    <volume>6</volume>
    <type>conferenceobject</type>
    <publisherName>Ernst &amp; Sohn Gmb</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Experimental Investigation on Buckling Behavior of soil-embedded Piles</title>
    <abstract language="eng">Monopiles are currently the predominant foundation type for offshore wind turbines in Europe. Due to the increasing dimensions of the turbines, pile diameters beyond 10m become necessary. A design-relevant failure mode of monopiles is the local buckling of the pile wall in the embedded sections. Relevant buckling guidelines do not consider the soil-structure interaction specifically, although the embedment may allow for a reduction of wall thickness. However, Eurocode-based design concepts require a validation with comparative buckling cases for validation, either in terms of buckling curve parameters for both the algebraic stress-based and semi-numerical LBA/MNA design concept or as a calibration factor kGMNIA for fully numerical GMNIA calculations. These parameters are not yet available for embedded shells. To close this gap, we have conducted experiments on piles embedded in sand to investigate local buckling under soil-structure-interaction. The results will be used to calibrate numerical models. This research was carried out as part of the VERBATIM research project, funded by PTJ/BMWK and supported by the Carbon Trust's Offshore Wind Accelerator consortium.</abstract>
    <parentTitle language="eng">ce/papers</parentTitle>
    <identifier type="issn">2509-7075</identifier>
    <identifier type="doi">10.1002/cepa.2313</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-583641</identifier>
    <enrichment key="eventName">EUROSTEEL 2023</enrichment>
    <enrichment key="eventPlace">Amsterdam, The Netherlands</enrichment>
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    <enrichment key="eventEnd">14.09.2023</enrichment>
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    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Hagen Balscheit</author>
    <author>A. Victor</author>
    <author>Marc Thiele</author>
    <author>Pablo Cuéllar</author>
    <author>Matthias Baeßler</author>
    <author>F. Lüddecke</author>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Wind</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Wind Energy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Shell Buckling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Offshore</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Soil-Structure-Interaction</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">7 Bauwerkssicherheit</collection>
    <collection role="institutes" number="">7.2 Ingenieurbau</collection>
    <collection role="themenfelder" number="">Energie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/58364/ce papers - 2023 - Balscheit.pdf</file>
  </doc>
  <doc>
    <id>63441</id>
    <completedYear/>
    <publishedYear>2025</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>505</pageFirst>
    <pageLast>510</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>International Society for Soil Mechanics and Geotechnical Engineering</publisherName>
    <publisherPlace>London</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">3D spatial modelling of CPT data for probabilistic preliminary assessment of potential pile tip damage upon collision with boulders</title>
    <abstract language="eng">Tip damage of monopiles from boulder collisions during installation has emerged as a critical design issue, primarily due to the combination of the widespread use of large-diameter piles and the complexity of the ground conditions at the available sites. Recently, a framework relating potential pile tip damage to cone tip resistance from Cone Penetration Tests (CPTs) has been proposed in the literature. Gaussian processes are powerful stochastic models that enable probabilistic spatial interpolation of soil data at any location within a site. On this basis, this study utilizes sparse CPT data from a site in the North Sea, to first develop an efficient Gaussian process regression model, which is used to derive a three-dimensional (3D) probabilistic predictive map of the cone tip resistance. Assuming deterministic loading conditions and a factual collision with a boulder of pre-defined properties, the cone tip resistance predictive model is subsequently used for a probabilistic preliminary assessment of potential pile tip damage. Results of the analysis are realistic 3D probability maps of potential damage that aim to support engineering judgment and contribute towards cost-effective site investigation planning and offshore wind farm design.</abstract>
    <parentTitle language="eng">Proceedings of the fifth International Symposium on Frontiers in Offshore Geotechnics (ISFOG 2025)</parentTitle>
    <identifier type="doi">10.53243/ISFOG2025-323</identifier>
    <identifier type="isbn">978-2-85782-758-0</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-634417</identifier>
    <enrichment key="eventName">5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG 2025)</enrichment>
    <enrichment key="eventPlace">Nantes, France</enrichment>
    <enrichment key="eventStart">09.06.2025</enrichment>
    <enrichment key="eventEnd">13.06.2025</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <licence>Allgemeines Deutsches Urheberrecht</licence>
    <author>Orestis Zinas</author>
    <author>Iason Papaioannou</author>
    <author>Ronald Schneider</author>
    <author>Pablo Cuéllar</author>
    <author>Matthias Baeßler</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>CPT data</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Gaussian process regression</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Boulder impact</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Preliminary pile tip damage assessment</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">7 Bauwerkssicherheit</collection>
    <collection role="institutes" number="">7.2 Ingenieurbau</collection>
    <collection role="themenfelder" number="">Energie</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <collection role="themenfelder" number="">Windenergie</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/63441/Zinas et al. ISFOG2025-323.pdf</file>
  </doc>
  <doc>
    <id>63387</id>
    <completedYear/>
    <publishedYear>2025</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1218</pageFirst>
    <pageLast>1223</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE)</publisherName>
    <publisherPlace>Nantes</publisherPlace>
    <creatingCorporation>ISSMGE</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Evaluation of pile tip buckling based on large scale tests</title>
    <abstract language="deu">Der Beitrag beschreibt eine groß angelegte Versuchskampagne mit Pfahlrammungen, um das Risiko des plastischen  Versagens der Pfahlspitze besser zu verstehen und numerische Modelle zu validieren. Ein numerisches Modell mit transientem Bodenkontakt zeigt eine gute Übereinstimmung mit den Testergebnissen. Parametervariationen verdeutlichen, wie empfindlich die Pfahlreaktion auf Imperfektionen und Randbedingungen ist.</abstract>
    <parentTitle language="eng">Proceedings of ISFOG 2025</parentTitle>
    <identifier type="doi">10.53243/ISFOG2025-476</identifier>
    <identifier type="isbn">978-2-85782-758-0</identifier>
    <enrichment key="eventName">5TH INTERNATIONAL SYMPOSIUM ON FRONTIERS IN OFFSHORE GEOTECHNICS</enrichment>
    <enrichment key="eventPlace">Nantes, France</enrichment>
    <enrichment key="eventStart">09.06.2025</enrichment>
    <enrichment key="eventEnd">13.06.2025</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Matthias Baeßler</author>
    <author>Hagen Balscheit</author>
    <author>Peter Geißler</author>
    <author>Winfried Schepers</author>
    <author>Pablo Cuèllar</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Pile Tip Buckling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Monopile</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Offshore Windenergy</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Driving Refusal</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Large Scale Test</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">7 Bauwerkssicherheit</collection>
    <collection role="institutes" number="">7.2 Ingenieurbau</collection>
    <collection role="themenfelder" number="">Energie</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
    <collection role="themenfelder" number="">Windenergie</collection>
  </doc>
  <doc>
    <id>39310</id>
    <completedYear/>
    <publishedYear>2015</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>609</pageFirst>
    <pageLast>620</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>101</volume>
    <type>article</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">System identification of inverse, multimodal and nonlinear problems using evolutionary computing - Application to a pile structure supported on nonlinear springs</title>
    <abstract language="eng">This paper deals with the system identification of a mechanical structure supported by nonlinear springs subjected to an external load. If all mechanical parameters of the system were known, the displacement of the system subjected to this load could be easily calculated. However, the monitoring applications often deal with the inverse problem. The loads and displacements of the system are known and certain mechanical Parameters of the system are sought. The solution of such inverse problems can be difficult, especially when they have a nonlinear and multimodal character, which often makes them appear intractable at first sight. However, evolutionary computing can be applied to solve this inverse, nonlinear and multimodal problem. Sometimes a prior knowledge exists on certain system properties, which is difficult to implement into analytical or numerical solvers. This knowledge can play a decisive role in identifying the System properties and it can be easily included as a boundary condition when applying evolutionary algorithms.&#13;
This article discusses how and under what conditions the unknown spring resistances can be identified. The practical application of this procedure is exemplified here with the mechanical system of a pile foundation.</abstract>
    <parentTitle language="eng">Engineering Structures</parentTitle>
    <identifier type="doi">10.1016/j.engstruct.2015.07.034</identifier>
    <identifier type="issn">0141-0296</identifier>
    <identifier type="issn">1873-7323</identifier>
    <enrichment key="date_peer_review">13.03.2017</enrichment>
    <author>Krassimire Karabeliov</author>
    <author>Pablo Cuéllar</author>
    <author>Matthias Baeßler</author>
    <author>Werner Rücker</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Evolutionary computing</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Inverse problem</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Multimodal solution</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>System identification</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Pile monitoring</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="ddc" number="624">Ingenieurbau</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>45721</id>
    <completedYear/>
    <publishedYear>2018</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>97</pageFirst>
    <pageLast>102</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>1</volume>
    <type>conferenceobject</type>
    <publisherName>NUMGE</publisherName>
    <publisherPlace>Porto, Portugal</publisherPlace>
    <creatingCorporation>Faculty of Engineering, University of Porto, Porto, Portugal</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A generalized plasticity model adapted for shearing interface problems</title>
    <abstract language="eng">The response of many geotechnical systems, whose structural behavior depends on shearing effect, is closely related to soil structure interaction phenomenon. Experimentally it is found that the localisation of these effect happens at a narrow soil layer next to the structure. Numerically, this behavior can be modelled through inter-face elements and adequate constitutive models. In this work, a constitutive model in the framework of Gen-eralized Plasticity for sandy soils has been chosen to be adapted for the interface zone. From the direct shear experiments a sandy soil at loose and dense states under different normal pressures is considered. The adapted constitutive model is able to reproduce contraction and dilatation of the soil according to its relative density and it shows a good agreement with the experimental data.</abstract>
    <parentTitle language="eng">Numerical Methods in Geotechnical Engineering IX</parentTitle>
    <identifier type="isbn">978-1-138-33198-3</identifier>
    <enrichment key="eventName">Conference</enrichment>
    <enrichment key="eventPlace">Porto, Portugal</enrichment>
    <enrichment key="eventStart">25.06.2018</enrichment>
    <enrichment key="eventEnd">27.06.2018</enrichment>
    <author>Borana Kullolli</author>
    <author>H. H. Stutz</author>
    <author>Pablo Cuéllar</author>
    <author>Matthias Baeßler</author>
    <author>F. Rackwitz</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Numerical modelling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Soil-pile interaction</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Interface</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Shearing</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="ddc" number="624">Ingenieurbau</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
  <doc>
    <id>28873</id>
    <completedYear/>
    <publishedYear>2013</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1336</pageFirst>
    <pageLast>1345</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation>American Society of Civil Engineers (ASCE)</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Relevant factors for the liquefaction susceptibility of cyclically loaded offshore monopiles in sand</title>
    <abstract language="eng">The offshore foundations may exhibit a relatively high liquefaction susceptibility due to the full saturation of the porous seabed and the cyclic nature of the typical offshore loads. Here, the particular relevance of some of the main factors that affect the liquefaction susceptibility of an offshore monopile will be addressed, focusing on the possibility of a progressive accumulation of residual pore water pressure within the saturated soil around a monopile under cyclic lateral loading. The discussion is based on numerical results obtained with a coupled FE model of the offshore foundation which includes the Biot-Zienkiewicz u-p model. A constitutive model of the Generalized Plasticity type has been used for the soil in order to reproduce important features of its behaviour under cyclic loading. This paper presents the findings derived from a parametric study of the problem and shows that the accumulation of residual pore pressure can produce significant changes of the pile's behaviour under external loading. The paper also investigates the effects caused by the loading from a realistic storm of moderate magnitude and the consequential transient degradation of the foundation's stiffness.</abstract>
    <parentTitle language="eng">Poromechanics V - 5th Biot conference on poromechanics (Proceedings)</parentTitle>
    <identifier type="old">31760</identifier>
    <identifier type="isbn">978-0-7844-1299-2</identifier>
    <identifier type="doi">10.1061/9780784412992.160</identifier>
    <enrichment key="eventName">Poromechanics V - 5th Biot conference on poromechanics</enrichment>
    <enrichment key="eventPlace">Vienna, Austria</enrichment>
    <enrichment key="eventStart">10.07.2013</enrichment>
    <enrichment key="eventEnd">12.07.2013</enrichment>
    <enrichment key="zsBemerkung">Der Vorgänger steht in der aus WoS erzeugten Excel-Tabelle unter dem Eintrag "PORO MECHANICS IV" (also mit einem Leerzeichen). Es handelt sich aber definitiv um die gleiche Veranstaltungsreihe. Wenn man im WoS im Feld "PUBLICATION NAME" mit "PORO MECHANICS IV" sucht, dann kommen Treffer, bei denen im Feld "Conference" das folgende steht: "4th Biot Conference on Poromechanics".  Jan Harloff-Puhr 23.01.2014</enrichment>
    <enrichment key="date_peer_review">05.08.2013</enrichment>
    <author>Pablo Cuéllar</author>
    <author>Matthias Baeßler</author>
    <author>Werner Rücker</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Soil liquefaction</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Cyclic loads</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Piles</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Sand (hydraulic)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Offshore structures</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>29517</id>
    <completedYear/>
    <publishedYear>2013</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst>77</pageFirst>
    <pageLast>89</pageLast>
    <pageNumber/>
    <edition/>
    <issue>2</issue>
    <volume>36</volume>
    <type>article</type>
    <publisherName>VGE Verl. GmbH</publisherName>
    <publisherPlace>Essen</publisherPlace>
    <creatingCorporation>Deutsche Gesellschaft für Erd- und Grundbau e. V., Essen</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Großversuche an Rammpfählen zur Ermittlung der Tragfähigkeit unter zyklischer Belastung und Standzeit</title>
    <abstract language="deu">Im Rahmen mehrerer vom Bundesumweltministerium geförderter Forschungsvorhaben untersucht die BAM Bundesanstalt für Materialforschung und -prüfung zusammen mit Partnern aus Industrie und Wissenschaft das Tragverhalten von zyklisch lateral und axial belasteten Rammpfählen für Offshore-Windkraftanlagen. Neben Modellversuchen im Labor werden hierbei auch Großversuche durchgeführt. In diesem Beitrag wird das neu erstellte Testfeld der BAM zur Prüfung von Pfählen in Horstwalde vorgestellt. In den laufenden Großversuchen werden Parameter wie Tragfähigkeitsminderung infolge zyklisch-axialer Lasten im Druck- und Zugbereich sowie die Zunahme von Tragfähigkeiten durch sogenannte Anwachseffekte untersucht. Bezüglich der zyklischen Belastungen werden insbesondere als unsicher anzunehmende Wertepaare in den derzeit verwendeten Interaktionsdiagrammen betrachtet, wobei hier das Hauptaugenmerk aber nicht nur auf dem Versagen des Pfahls, sondern auch auf der Ermittlung der Resttragfähigkeit nach definierten Zyklenzahlen liegt. Im Beitrag werden erste Ergebnisse zu den Anwachseffekten präsentiert und mit Ergebnissen aus der Literatur verglichen. Des Weiteren werden das Versuchsprogramm zu den zyklisch axial belasteten Pfählen vorgestellt und erste Ergebnisse gezeigt. In einem Ausblick werden weitere Ziele des Forschungsvorhabens beschrieben. Hierzu gehören die Validierung und Kalibrierung eines existierenden Modells zur Ermittlung der Tragfähigkeit unter zyklischer Belastung auf der Grundlage aktueller Messdaten am Pfahl.-----------------------------------------------------------------------------------------------&#13;
 &#13;
&#13;
Large-scale tests on driven piles for the investigation of pile capacity under cyclic loading and ageing effects. The cyclic behaviour of axially and laterally loaded piles for the foundation of offshore wind turbines is being investigated by the Federal Institute for Materials Research and Testing (BAM) in the frame of several research projects funded by the German Federal Ministry for the Environment and carried out in cooperation with industrial and academic partners. To this end, physical model tests in reduced scale as well as large scale field tests are being performed. This paper presents the new pile testing facility in the BAM's testing site at Horstwalde. The large-scale tests being performed there are aiming at the pile capacity degradation due to cyclic axial loading (both in tension and compression) as well as at the investigation of the capacity gains due to ageing effects (pile setup). Concerning the cyclic loading, the investigations have been mainly focused on special load combinations where there is little experience and where current interaction diagrams are loosely defined. However, the aim of the tests was not the cyclic failure, but rather the assessment of the post-cyclic capacity after the application of a pre-defined number of load cycles. Here, the testing program is summarised and some key results from the first testing campaign are discussed. The paper also presents some preliminary results concerning the capacity gains through ageing and compares them to previous experience from the literature. Finally, the paper gives an outlook on further goals of the current research projects, including the validation and calibration of a design model for the cyclic capacity of piles based on measured data from real piles.</abstract>
    <parentTitle language="deu">Geotechnik</parentTitle>
    <identifier type="old">32443</identifier>
    <identifier type="doi">10.1002/gete.201200021</identifier>
    <identifier type="issn">0172-6145</identifier>
    <identifier type="issn">1865-7362</identifier>
    <identifier type="issn">2190-6653</identifier>
    <author>Werner Rücker</author>
    <author>Krassimire Karabeliov</author>
    <author>Pablo Cuéllar</author>
    <author>Matthias Baeßler</author>
    <author>Steven Georgi</author>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>29591</id>
    <completedYear/>
    <publishedYear>2013</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>10</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation>APMTAC</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Numerical modeling of train-track-interaction at bridge transition zones considering the long-term behaviour</title>
    <abstract language="eng">A train passage will induce elastic and plastic deformations in the ballast and ist underlying soll. Considering the short term behaviour the elastic deformations will overweight the plastic and therefore these can be neglected. Regarding the long term behaviour the plastic deformations will accumulate due to repeating traffic loads and lead to settlement and Deterioration ofthe track structure. A smooth settlement along the track (small differential Settlement) is acceptable, whereas large differential settlement accelerates the process of deterioration and reduces the safety and serviceability ofthe track.&#13;
Especially a bridge transition zone is prone to large differential settlements, where the track deteriorates in the backfilling area of bridge abutments mainly due to stiffness changes between embankment and bridge, repeating traffic loads and displacements of the superstructure Ends on bridges. A numerical model will be presented, with a particular focus on the long term behaviour of the track at bridge transition zones under repeating traffic loads. The ahn ofthe Simulation is not the computation of every train Crossing but the analysis of the long term behaviour of the bridge transition zone based on single train crossings. &#13;
The analysis is performed in the time domain, whereas the bridge, the track and the backfilling area are modelled by means of the finite</abstract>
    <parentTitle language="eng">ICOVP-2013 - 11th International conference on vibration problems (Proceedings)</parentTitle>
    <identifier type="old">32517</identifier>
    <identifier type="isbn">978-989-96264-4-7</identifier>
    <enrichment key="eventName">ICOVP-2013 - 11th International conference on vibration problems</enrichment>
    <enrichment key="eventPlace">Lisbon, Portugal</enrichment>
    <enrichment key="eventStart">09.09.2013</enrichment>
    <enrichment key="eventEnd">12.09.2013</enrichment>
    <enrichment key="date_peer_review">21.11.2013</enrichment>
    <author>Jeffrey Bronsert</author>
    <author>Matthias Baeßler</author>
    <author>Pablo Cuéllar</author>
    <author>Werner Rücker</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Train-track-interaction</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Transition zone</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Track settlement</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>30490</id>
    <completedYear/>
    <publishedYear>2014</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>75</pageFirst>
    <pageLast>86</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>59</volume>
    <type>article</type>
    <publisherName>Elsevier Ltd.</publisherName>
    <publisherPlace>Barking</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A numerical model for the transient analysis of offshore foundations under cyclic loading</title>
    <abstract language="eng">A comprehensive numerical model for the analysis of offshore foundations under a general transient loading is presented here. The theoretical basis of the model lies on the Swansea formulation of Biot's equations of dynamic poroelasticity combined with a constitutive model that reproduces key aspects of cyclic soil behaviour in the frame of the theory of generalised plasticity. On the practical side, the adoption of appropriate finite element formulations may prevent the appearance of spurious numerical instabilities of the pore pressure field. In this respect, the use of a coupled enhanced-strain element is here proposed. On the other hand, the practicality of the presented model depends ultimately on its computational efficiency. Some practical recommendations concerning the solution strategies, the matrix storage/handling procedures and the parallel multi-processor computation are here provided. Finally, the performance of the model with a benchmark study case and its practical application to analyse the soil–structure interaction of an offshore monopile under a realistic transient storm loading are discussed.</abstract>
    <parentTitle language="eng">Computers and geotechnics</parentTitle>
    <identifier type="old">33464</identifier>
    <identifier type="doi">10.1016/j.compgeo.2014.02.005</identifier>
    <identifier type="issn">0266-352x</identifier>
    <enrichment key="date_peer_review">07.04.2014</enrichment>
    <author>Pablo Cuéllar</author>
    <author>P. Mira</author>
    <author>M. Pastor</author>
    <author>J.A.F. Merodo</author>
    <author>Matthias Baeßler</author>
    <author>Werner Rücker</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Offshore foundations</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Cyclic loading</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Numerical model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Pore pressure accumulation</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Liquefaction analysis</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>30486</id>
    <completedYear/>
    <publishedYear>2014</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst>97</pageFirst>
    <pageLast>108</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation>BAM Bundesanstalt für Materialforschung und -prüfung</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Ermittlung von Beanspruchung und Verformungen von Pfahlgründungen - Messverfahren und Applikation</title>
    <abstract language="deu">Vor dem Hintergrund einer angestrebten größeren Unabhängigkeit der Energieversorgung von fossilen Energieträgern hat die Windenergie in den letzten Dekaden zunehmend an Bedeutung gewonnen. Dabei wird insbesondere die Energiegewinnung offshore in der Deutschen Nordsee, auf Grund dort vorhandener stetiger Winde und sinkender Akzeptanz von Windkraftanlagen an Land, forciert. Im Hinblick auf die Gründung dieser Anlagen wird technisches Neuland betreten.&#13;
Angesichts von Wassertiefen bis über 25 m erhalten aufgelöste Gründungsstrukturen wie Tripod und Jacket oft den Vorzug vor Monopiles. Letztere waren wegen der geringen Produktions- und Installationskosten, der bisher am häufigsten angewandte Gründungstyp in flacheren Gewässern.&#13;
Monopile- und Mehrpfahlgründung unterscheiden sich wesentlich im Abtrag der Belastung durch Beanspruchungen aus Wind und Wellen in den umgebenden Baugrund. Während beim Monopile die zyklischen Momente über laterale Bettung abgetragen werden, entstehen an den Mehrpfahlgründungen axiale Zug- und Druckbelastungspaare in gegenüberliegenden Pfählen. Die zyklischen Belastungen von Monopiles sind demnach hauptsächlich in lateraler Richtung zu erwarten, während für Mehrpfahlgründungen die zyklische Belastung einen überwiegend axialen Charakter aufweist. Die zyklischen axialen Lasten in den Pfählen der Mehrpfahlgründungen können die axialen Tragfähigkeiten insbesondere am Pfahlmantel reduzieren und damit evtl, zu einem Versagen der Gründung führen.</abstract>
    <parentTitle language="deu">Messen im Bauwesen 2014 - Neue Messtechnik und Anwendungsfälle</parentTitle>
    <identifier type="old">33460</identifier>
    <identifier type="isbn">978-3-9815944-7-8</identifier>
    <enrichment key="eventName">Messen im Bauwesen 2014 - Neue Messtechnik und Anwendungsfälle</enrichment>
    <enrichment key="eventPlace">Berlin, Germany</enrichment>
    <enrichment key="eventStart">04.03.2014</enrichment>
    <enrichment key="eventEnd">04.03.2014</enrichment>
    <author>Steven Georgi</author>
    <author>Matthias Baeßler</author>
    <author>Pablo Cuéllar</author>
    <author>Krassimire Karabeliov</author>
    <author>Werner Rücker</author>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Zyklik</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Pfahl</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Tragfähigkeit</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Dehnungsmessung</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>31142</id>
    <completedYear/>
    <publishedYear>2014</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>8</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>CRC Press</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Evaluating the degradation of ballasted track at bridges for high-speed railways</title>
    <abstract language="eng">The bridge design for railway bridges is far more dependent on the interaction with the traffic and the carriageway than for road bridges. This is especially true for the specific demands of the track in highspeed railways. Both maintenance and safety of the track have to be considered. The most relevant sections for the design criteria can be located at the bridge transition zones. Based on experimental investigations it is shown that bridge joint displacements, changes in stiffness and uplifting of the sleeper are causes for an increased degradation and loss in strength of the ballasted track. With respect to high speed vibrations of the bridge deck can have an even more decisive impact. Bridge deck vibrations can lead to destabilization of the bailast. In a numerical study the behavior of the track at the bridge is illustrated.</abstract>
    <parentTitle language="eng">IABMAS 2014 - 7th International conference of bridge maintenance, safety and management (Proceedings)</parentTitle>
    <identifier type="old">34136</identifier>
    <identifier type="isbn">978-1-138-00103-9</identifier>
    <identifier type="isbn">978-1-315-76069-8</identifier>
    <enrichment key="eventName">IABMAS 2014 - 7th International conference of bridge maintenance, safety and management</enrichment>
    <enrichment key="eventPlace">Shanghai, China</enrichment>
    <enrichment key="eventStart">07.07.2014</enrichment>
    <enrichment key="eventEnd">11.07.2014</enrichment>
    <enrichment key="date_peer_review">11.08.2014</enrichment>
    <author>Matthias Baeßler</author>
    <author>Jeffrey Bronsert</author>
    <author>Pablo Cuéllar</author>
    <author>Werner Rücker</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Train-track-bridge-interaction</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Bridge transition zone</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Assessment criteria</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Vehicle model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Numerical model</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>31144</id>
    <completedYear/>
    <publishedYear>2014</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>799</pageFirst>
    <pageLast>804</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Assessment and optimisation of bridge transition zones on the basis of a numerical model for train-track-bridge interaction</title>
    <abstract language="eng">The main degradation process at bridge transition zones due to traffic loads is the appearance of differential settlements. Abrupt stiffness changes, repeating traffic loads and relative displacements of the superstructure ends on bridges often aggravate this problem. In this contribution, a 3D finite element (FE) model extended with a boundary formulation in the frame of the scaled-boundary finite element method (SBFEM) for a transient analysis of train-track-bridge interaction is presented. This numerical model permits an assessment of bridge transition zone with respect to permanent deformations of the track. The main focus lies on the modeling strategies for the vehicle and their impact on suitable assessment criteria for bridge transition zones. For this purpose, two different modeling strategies for the vehicle, a moving load model and a multibody model, have been compared and discussed on the basis of the assessment criteria. The results indicate that the model of the vehicle has a minor effect for an assessment on the embankment, but that the assessment on the bridge may show significant differences depending on whether the inertial components of the vehicle (multibody model) are considered.</abstract>
    <parentTitle language="eng">EURODYN 2014 - 9th International conference on structural dynamics (Proceedings)</parentTitle>
    <identifier type="old">34138</identifier>
    <identifier type="isbn">978-972-752-165-4</identifier>
    <identifier type="issn">2311-9020</identifier>
    <enrichment key="eventName">EURODYN 2014 - 9th International conference on structural dynamics</enrichment>
    <enrichment key="eventPlace">Porto, Portugal</enrichment>
    <enrichment key="eventStart">30.06.2014</enrichment>
    <enrichment key="eventEnd">02.07.2014</enrichment>
    <enrichment key="date_peer_review">11.08.2014</enrichment>
    <author>Jeffrey Bronsert</author>
    <author>Matthias Baeßler</author>
    <author>Pablo Cuéllar</author>
    <author>Werner Rücker</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Train-track-bridge-interaction</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Bridge transition zone</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Assessment criteria</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Vehicle model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Numerical model</value>
    </subject>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>46004</id>
    <completedYear/>
    <publishedYear>2018</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>V009T10A013, 1</pageFirst>
    <pageLast>9</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>9</volume>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Insights into compaction grouting for offshore pile foundations</title>
    <abstract language="eng">The authors are currently investigating the possibility to apply compaction grouting for offshore pile foundations (Jacket piles as well as monopiles) as a possible retrofitting technique for an optimised foundation concept. In this research project, we are developing a design approach aiming to predict the ideal amount and properties of a grout for a specific soil situation and desired improvement of pile bearing capacity after Installation and during service time. Both numerical and experimental tests have been carried out to investigate the injection process during which a highly viscous grout is injected into the soil under high pressure to displace and compact the surrounding soil without fracturing it. The implicit Material Point Method (MPM) based on a mixed formulation is the numerical technique chosen to deal with the expected large deformations and the arbitrary shape of the developing grout bulb. The usage of MPM prevents both the need of remeshing and the numerical instability induced by extensive mesh distortion. For validation with experimental results, we have constructed a testing chamber with one transparent sidewall. This chamber enables us to observe the injection process directly at the transparent vertical window and to measure the in-plane soil displacements and strains by means of the Digital Image Correlation (DIC) technique.&#13;
The results already reveal the interrelation of soil and grout properties for a successful usage of this common ground improvement technique.</abstract>
    <parentTitle language="eng">Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering OMAE 2018</parentTitle>
    <identifier type="isbn">978-0-7918-5130-2</identifier>
    <identifier type="issn">2153-4772</identifier>
    <enrichment key="eventName">37th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2018)</enrichment>
    <enrichment key="eventPlace">Madrid, Spain</enrichment>
    <enrichment key="eventStart">18.06.2018</enrichment>
    <enrichment key="eventEnd">22.06.2018</enrichment>
    <enrichment key="date_peer_review">29.11.2018</enrichment>
    <author>Peter Geißler</author>
    <author>Pablo Cuéllar</author>
    <author>Götz Hüsken</author>
    <author>Hans-Carsten Kühne</author>
    <author>Matthias Baeßler</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Offshore pile foundation</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Compaction grouting</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Material Point Method (MPM)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mixed formulation</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Digital Image Correlation (DIC)</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="ddc" number="624">Ingenieurbau</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
  <doc>
    <id>49166</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>355</pageFirst>
    <pageLast>369</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>91</volume>
    <type>bookpart</type>
    <publisherName>Springer</publisherName>
    <publisherPlace>Cham, Switzerland</publisherPlace>
    <creatingCorporation>IBF KIT</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Stability and large deformations of slender structures supported by soil materials</title>
    <abstract language="eng">The stability and geometric nonlinearities of slender structures are a major topic in structural design. While this topic is most relevant in the field of Structural Engineering, e.g. for steel or concrete structures, only few applications take the role of soil-structure-interaction explicitly into account. The focus of this paper is placed on the impact of soil support and its modelling for the buckling analysis based on examples both for pile foundations and for railway track stability. The general interaction between steel design and the geotechnical input will be addressed. The paper discusses and summarizes a range of subtopics based on experience and current research at the author’s institute.</abstract>
    <parentTitle language="eng">Recent Developments of Soil Mechanics and Geotechnics in Theory and Practice; Lecture Notes in Applied and Computational Mechanics</parentTitle>
    <identifier type="isbn">978-3-030-28515-9</identifier>
    <identifier type="isbn">978-3-030-28516-6</identifier>
    <identifier type="doi">10.1007/978-3-030-28516-6</identifier>
    <identifier type="issn">1613-7736</identifier>
    <identifier type="issn">1860-0816</identifier>
    <enrichment key="date_peer_review">13.02.2020</enrichment>
    <author>Matthias Baeßler</author>
    <author>Pablo Cuéllar</author>
    <author>A. Victor</author>
    <author>F. Lüddecke</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Buckling soil-structure-interaction offshore piles track</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">7 Bauwerkssicherheit</collection>
    <collection role="institutes" number="">7.2 Ingenieurbau</collection>
    <collection role="themenfelder" number="">Energie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>59535</id>
    <completedYear/>
    <publishedYear>2024</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>lecture</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">VERBATIM: Project Introduction and Large Scale Experiments</title>
    <abstract language="eng">The presentation summarizes the scope of the joint project VERBATIM on buckling of large Monopiles. The presented work from the authors focusses on the experimental field tests of large predented piles during driving and a numerical investigation on the observed buckling behaviour.</abstract>
    <enrichment key="eventName">Colloquium „Buckling of Offshore Wind Energy Structures“</enrichment>
    <enrichment key="eventPlace">Berlin, Germany</enrichment>
    <enrichment key="eventStart">14.02.2024</enrichment>
    <enrichment key="eventEnd">15.02.2024</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <enrichment key="InvitedTalks">0</enrichment>
    <author>Matthias Baeßler</author>
    <author>Pablo Cuéllar</author>
    <author>Winfried Schepers</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Buckling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Offshore</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Wind Energy Structures</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Monopiles</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Pile-Tip-Buckling</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">7 Bauwerkssicherheit</collection>
    <collection role="institutes" number="">7.2 Ingenieurbau</collection>
    <collection role="themenfelder" number="">Energie</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Präsentation</collection>
    <collection role="themenfelder" number="">Windenergie</collection>
  </doc>
  <doc>
    <id>39340</id>
    <completedYear/>
    <publishedYear>2017</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>53</pageFirst>
    <pageLast>59</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>bookpart</type>
    <publisherName>Springer</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Please Avoid Tilting - Application-Oriented Design and Monitoring Model for Foundation Structures Subjected to Cyclic Loads</title>
    <abstract language="eng">A great deal is possible, even on the seabed. Together, wind and waves shake the foundations of the offshore wind turbines. "ere is also the “normal” current and ebb and #ow of the tides that are so distinctive in the North Sea. Pore water pressure can also occur on the seabed, loosening it. Where monopiles are involved, the worst case is that the stability of the whole turbine can be altered – even if such a monopile rammed into the seabed has a diameter of up to eight metres. Over half the planned offshore wind turbines in the North and Baltic Seas are to have monopile foundations, and over 40 % are to have multi-pile foundations, designed for example as a tripod. "is is why pile foundations and their loads deserve special attention. For one thing above all is to be avoided in plant operations, and that is the risk of turbine tilt.</abstract>
    <parentTitle language="eng">Sea, Wind, Power</parentTitle>
    <identifier type="isbn">978-3-662-53178-5</identifier>
    <identifier type="doi">10.1007/978-3-662-53179-2</identifier>
    <author>Werner Rücker</author>
    <author>Pablo Cuéllar</author>
    <author>Steven Georgi</author>
    <author>Krassimire Karabeliov</author>
    <author>Matthias Baeßler</author>
    <author>Björn Johnsen</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Pile foundations</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Offshore wind turbines</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Cyclic loads</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="ddc" number="624">Ingenieurbau</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>42962</id>
    <completedYear/>
    <publishedYear>2017</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>167</pageFirst>
    <pageLast>174</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>Polytechnic University of Tirana</publisherName>
    <publisherPlace>Tirana, Albania</publisherPlace>
    <creatingCorporation>Polytechnic University of Tirana</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">On contact problem application for the local behavior of soil-pile interaction</title>
    <abstract language="eng">In this paper a shear test, which helps to study local behavior of the soil-pile interaction, is modelled numerically with the Finite Element Method as a 2D plane strain problem. A normal pressure on top and shear displacement on side were applied. So far, the material behavior was considered elastic for the sake of simplicity.&#13;
The effect of thickness on contact elements and the presence of in plane stress has been highlighted. The purpose of the paper is to find a suitable contact element which represents more close to reality a soil-pile interaction problem under cyclic axial loading. Moreover, an insight on the presence of in-plane stress shows that it needs to be considered cautiously.</abstract>
    <parentTitle language="eng">Book of Proceedings ICCE2017</parentTitle>
    <enrichment key="eventName">ICCE2017</enrichment>
    <enrichment key="eventPlace">Tirana, Albania</enrichment>
    <enrichment key="eventStart">12.10.2017</enrichment>
    <enrichment key="eventEnd">14.10.2017</enrichment>
    <author>Borana Kullolli</author>
    <author>Pablo Cuéllar</author>
    <author>Matthias Baeßler</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Contact problem</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Numerical modelling</value>
    </subject>
    <collection role="ddc" number="624">Ingenieurbau</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
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