@article{RoederFueger, author = {R{\"o}der, J{\"o}rg and F{\"u}ger, Benedikt}, title = {Versuchsbasierte Entwicklung eines Bemessungskonzeptes zur Risssanierung in Massivlehmbauten (ERiMa)}, series = {ce/papers}, volume = {8}, journal = {ce/papers}, number = {1}, publisher = {Ernst \& Sohn}, address = {Berlin}, issn = {2509-7075}, doi = {10.1002/cepa.3298}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:525-36135}, pages = {146 -- 157}, abstract = {Das ERiMa-Projekt der Fachhochschule Potsdam verfolgt das Ziel, ein praxistaugliches Konzept f{\"u}r die Planung, Bemessung und Ausf{\"u}hrung der statisch wirksamen Risssanierung von Massivlehmbauten zu entwickeln. Im Fokus steht die {\"U}bertragung des aus dem Mauerwerksbau etablierten Verfahrens der Rissvernadelung auf den Lehmbau, wobei die spezifischen materialtechnischen und baustatischen Eigenschaften von Lehm ber{\"u}cksichtigt werden. Im Rahmen des Forschungsprojekts werden Auszugsversuche durchgef{\"u}hrt, bei denen verschiedene Kombinationen von Untergr{\"u}nden, Ankerst{\"a}ben und M{\"o}rteltypen untersucht werden. Dar{\"u}ber hinaus sind unter anderem noch Materialanalysen und FEM-Simulationen im Forschungsprogramm vorgesehen. Ziel ist es, die relevanten Einflussfaktoren zu identifizieren, um langfristig einen Tragf{\"a}higkeitsnachweis f{\"u}r die Rissvernadelung in Massivlehm unter Ber{\"u}cksichtigung der Stoffvielfalt von Lehmw{\"a}nden zu entwickeln. Dadurch soll eine belastbare Nachweisf{\"u}hrung f{\"u}r instandgesetzte Wandkonstruktionen aus Lehm gew{\"a}hrleistet werden.}, subject = {Lehmbau}, language = {de} } @article{WangCudmaniPenaOlarte, author = {Wang, Zhihui and Cudmani, Roberto and Pe{\~n}a Olarte, Andr{\´e}s Alfonso}, title = {Connecting and distinguishing conventional and data-driven constitutive models}, series = {Journal of the Mechanics and Physics of Solids}, volume = {200}, journal = {Journal of the Mechanics and Physics of Solids}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0022-5096}, doi = {10.1016/j.jmps.2025.106122}, pages = {33}, abstract = {In conventional constitutive models for granular materials, calibration involves estimating a few parameters within known mathematical expressions. In contrast, data-driven constitutive models couple the model structure and parameters. Addressing this fundamental difference, the development of constitutive models based on Physics-encoded Neural Networks (PeNN) is guided from the perspective of conventional model development, highlighting similarities and differences. The crucial physical information that influences PeNN is explained, and the incorporation of three key state boundary surfaces in pressure-porosity space - critical state, loosest state, and densest state - via physics-informed deep learning is detailed. Physics-informed calibration is performed using the augmented Lagrangian method; then, the calibrated models undergo extensive drained and undrained simulations. Results indicate that using only physical information from state boundary surfaces, without data within these boundaries, fails to calibrate data-driven models; thus, boundary surface information represents partial physical information. While combining partial physical information with reasonably distributed data can improve model development under limited experimental data, adding more partial physical information and data does not necessarily enhance the results. The finding aims to bridge the gap between conventional and data-driven constitutive models, hopefully increasing the reliability and interpretability of data-driven models.}, subject = {Deep Learning}, language = {en} } @article{AnandGuptaSiwachetal., author = {Anand, Shivraj and Gupta, Deepak and Siwach, Chhavi and Nowak, Jens and Rustige, Heribert and Mishra, Virendra Kumar}, title = {French Type Vertical Flow Constructed Wetland as a Sustainable Solution for Domestic Sewage Treatment}, series = {Environmental Management}, volume = {75}, journal = {Environmental Management}, number = {8}, publisher = {Springer International Publishing}, address = {Cham}, issn = {0364-152X}, doi = {10.1007/s00267-025-02186-2}, pages = {2078 -- 2088}, abstract = {In order to mitigate the risk posed by discharge of untreated wastewater and enhance the quality of wastewater prior to its release or reuse, it is important to adopt nature based treatment technologies. The current study was performed with objective to treat the primary treated sewage collected from a traditional Moving Bed Biofilm Reactor (MBBR) based Sewage treatment plant (STP) by using a two-stage French Type Vertical Flow Constructed Wetland (FVFCW). This pilot-scale study was undertaken in Banaras Hindu University Campus Varanasi, Uttar Pradesh. The wetland unit was a two-stage Vertical Flow Constructed Wetland system (VFCW) filled with two different filter media gravel \& sand and planted with two different macrophytes Canna indica and Typha latifolia which was operated for Sustainable treatment of primary sewage. The VFCW was operated at three different Hydraulic loading rate (HLR) i.e. 1800, 2700, 3600 L/day for nine months. The VFCW performed for the treatment of different physicochemical parameters at given loading rates. The maximum removal efficiency of 72.37, 76.47, 100, 87.23, 41.41, 40.77 27.07\% was recorded for COD, BOD, Turbidity, TSS, TDS, Phosphate and Ammonia respectively. Most of the Parameters showed maximum removal efficiency at HLR 2700 L/day. The study suggested that Experimental VFCW can be a sustainable solution for wastewater treatment in remote and rural areas of India as well small colonies due to its eco-friendly, cost-effective, low maintenance cost and lack of operational expertise.}, subject = {Feuchtgebiet}, language = {en} } @inproceedings{BoernerLinkeRoederetal., author = {B{\"o}rner, Tommy and Linke, Gunter and R{\"o}der, J{\"o}rg and Rug, Wolfgang}, title = {Vergleichende Untersuchungen an historischem Brettschichtholz mit nat{\"u}rlich basiertem Klebstoff unter Beachtung alterungs- und einbaubedingter Einwirkungen auf die Tragf{\"a}higkeit}, series = {9. Kolloquium Erhaltung von Bauwerken : Fachtagung {\"u}ber innovative L{\"o}sungen f{\"u}r die Bauwerkserhaltung von heute und morgen : Tagungshandbuch 2025}, booktitle = {9. Kolloquium Erhaltung von Bauwerken : Fachtagung {\"u}ber innovative L{\"o}sungen f{\"u}r die Bauwerkserhaltung von heute und morgen : Tagungshandbuch 2025}, editor = {Raupach, Michael and Schwamborn, Bernd and Wolff, Lars}, publisher = {expert-Verlag}, address = {T{\"u}bingen}, isbn = {978-3-381-13841-8}, pages = {13 -- 20}, abstract = {Mit der Anmeldung des Patents DRP Nr. 197773 legte der Großherzogliche Zimmerermeister Otto Hetzer (1849 - 1911) im Jahr 1906 den Grundstein f{\"u}r die Entwicklung von Brettschichtholz wie es heute bekannt ist. Seine innovative Bauweise f{\"u}hrte nicht nur zu einer Holzersparnis bei den Konstruktionen, sondern auch zu einer Entwicklung, ohne die der heutige Ingenieurholzbau nicht so leistungs- und konkurrenzf{\"a}hig w{\"a}re. Mangelnde Erkenntnisse {\"u}ber historische Brettschichtholzkonstruktionen f{\"u}hren immer wieder zum Abriss dieser bedeutenden Bauwerke und Zeugnisse ingenieurtechnischer Schaffenskraft. Der vorliegende Beitrag dient zur Erweiterung des Wissenstands {\"u}ber historisches Brettschichtholz sowie naturbasierte Klebstoffe. Gleichfalls wird der Frage nachgegangen, wie historische Brettschichtholzkonstruktionen im Kontext der aktuellen Normung erhalten werden k{\"o}nnen und auf welche Besonderheiten im Zuge dessen geachtet werden muss.}, subject = {Brettschichtholz}, language = {de} } @article{SafariallahkheiliSchieweMeier, author = {Safariallahkheili, Qasem and Schiewe, Jochen and Meier, Sebastian}, title = {Post-Hoc Explanation of AI Predictions in Wildfire Risk Mapping Through an Interactive Web-Based GeoXAI System}, series = {KN - Journal of cartography and geographic information}, journal = {KN - Journal of cartography and geographic information}, publisher = {Springer International Publishing}, address = {Cham}, issn = {2524-4957}, doi = {10.1007/s42489-025-00194-0}, pages = {16}, abstract = {This case study presents an innovative approach for explaining wildfire susceptibility through a web-based Geospatial eXplainable Artificial Intelligence (GeoXAI) system. By addressing limitations in traditional GeoXAI tools, such as the lack of geographical context for model predictions and local explanation, this system integrates state-of-the-art XAI methods with open-source geospatial technologies. Applied to the wildfire-prone regions of Berlin and Brandenburg, Germany, the system combines environmental, topographic, and meteorological features derived from high-resolution geospatial data for training a Random Forest (RF) model. The web-based GeoXAI system enables interactive exploration of the model output and its features, allowing users to visualize wildfire susceptibility, examine feature contributions, and correlate predictions with spatial patterns through post-hoc interpretability. By employing post-hoc explanation methods like SHAP, the system offers clear insights into model predictions by analyzing feature contributions after training, which helps users better understand AI-driven outcomes. Designed with a user-centered approach, the platform promotes trust and usability through transparent predictions, interactive geovisualizations, and local explanations, allowing users to navigate spatial data intuitively by exploring overviews, focusing on specific regions, and accessing detailed insights on demand. This work highlights the potential of combining GeoXAI with machine learning to improve decision-making in wildfire prevention and management.}, subject = {Entscheidungsunterst{\"u}tzungssystem}, language = {en} } @article{SchmidBondevonderWeideRoeder, author = {Schmid-Bonde, Finn E. and von der Weide, Peter and R{\"o}der, J{\"o}rg}, title = {Die Muschelgrotte (Neuer Garten Potsdam)}, series = {Bauphysik : W{\"a}rme, Feuchte, Schall, Brand, Licht, Energie, Klima}, volume = {47}, journal = {Bauphysik : W{\"a}rme, Feuchte, Schall, Brand, Licht, Energie, Klima}, number = {4}, publisher = {Ernst \& Sohn}, address = {Berlin}, issn = {0171-5445}, doi = {10.1002/bapi.202500021}, pages = {278 -- 285}, abstract = {In der diesem Bericht zugrundeliegenden Diplomarbeit wurde das raumklimatische Verhalten der Muschelgrotte im Neuen Garten in Potsdam in Abh{\"a}ngigkeit von verschiedenen L{\"u}ftungsszenarien und unter Ber{\"u}cksichtigung der {\"u}ber den Fußboden eindiffundierenden Feuchte untersucht. Bevor das Raumklima untersucht und das hygrothermische Verhalten des Bauwerks mittels Simulationen bewertet wurde, wurden im Rahmen einer Bauaufnahme geotechnische und bauphysikalische Untersuchungen vorgenommen. In den hygrothermischen Geb{\"a}udesimulationen wurde der bauphysikalischen Interaktion zwischen dem Raumklima und dem feuchtebelasteten Fußboden besondere Aufmerksamkeit gewidmet. Abschließend wurden M{\"o}glichkeiten zur Reduzierung der Raumluft- und Oberfl{\"a}chenfeuchte sowie feuchtetechnischen Situation des Fußbodens herausgestellt.}, subject = {Diffusion}, language = {de} } @inproceedings{MolinaCudmaniPenaOlarte, author = {Molina, M. Victoria and Cudmani, Roberto and Pe{\~n}a-Olarte, Andr{\´e}s Alfonso}, title = {Micromechanical analysis of the cyclic mechanical response of granular materials through DEM simulations}, series = {Powders \& Grains 2025}, booktitle = {Powders \& Grains 2025}, editor = {Alam, Meheboob and Lal Das, Sovan and Bose, Manaswita and Murthy, Tejas and Chikkadi, Vijayakumar and Singh, Anugrah and Luding, Stefan}, publisher = {EDP Sciences}, address = {Frankreich}, doi = {10.1051/epjconf/202534007020}, pages = {4}, abstract = {In this study, we investigate with the Discrete Element Method (DEM) the mechanical behavior of a cohesionless granular material under undrained true triaxial conditions, considering both monotonic and cyclic loading. We link the microstructure evolution within the granular assembly to its macroscopic cyclic response. To capture the mechanical response of our reference material (Karlsruhe fine sand), a rolling resistance linear contact model along with spherical particles is calibrated through a trial-and-error process, adjusting the model parameters to capture the experimentally observed behavior as close as possible. A series of cyclic undrained triaxial tests were simulated to investigate the micromechanical processes underlying liquefaction of sand under cyclic shearing. We analyzed the evolution of various fabric indices, including the redundancy index, contact normal orientations, and fabric anisotropy in relation to the pre- and post-liquefaction responses. The results reveal that a redundancy index below unity provides a unified criterion for the loss of the isostatic condition within the granular assembly, which triggers the onset of liquefaction. Throughout the cyclic loading process, sliding-dominant contact-yielding mechanisms remain prevalent. Additionally, significant changes in contact normal orientation and increasing fabric anisotropy dependent on the induced axial strain occur as the sample undergoes post-liquefaction deformation.}, subject = {Diskrete-Elemente-Methode}, language = {en} } @inproceedings{LorencSeidl, author = {Lorenc, Wojciech and Seidl, G{\"u}nter}, title = {Composite dowels: Steel part of the shear connection. New design guidelines CEN/TS 1994-1-102, experience in the field of manufacturing technology and new structures}, series = {Advances in Steel and Steel-Concrete Composite Structures : Bridging Science and Industry}, booktitle = {Advances in Steel and Steel-Concrete Composite Structures : Bridging Science and Industry}, editor = {Lorenc, Wojciech and Czepiżak, Dariusz and Kozioł, Piotr and Giżejowski, Marian A. and Marcinowski, Jakub and Hotała, Eugeniusz}, edition = {1st Edition}, publisher = {Routledge, Taylor \& Francis}, address = {London}, isbn = {978-1-003-53446-4}, doi = {10.1201/9781003534464-40}, pages = {401 -- 417}, abstract = {Introduced to construction about 20 years ago, the composite dowels shear connection is now used more and more widely in engineering, mostly in bridge construction. During this time, production and construction technologies were refined, design guidelines were developed, and finally a new Technical Specification CEN/TS 1994-1-102 was established. This paper summarizes the experience and design principles related to the steel part of the connection, focusing on the latest achievements in recent years: technology of production, solutions and design approach.}, subject = {Hochbau}, language = {en} } @article{SahmPreissSeidletal., author = {Sahm, Daniel and Preiß, Tabatha and Seidl, G{\"u}nter and Pak, Daniel}, title = {Transiente Thermografie zur Schadensdetektion aufgeschweißter Bolzen an Schienenst{\"u}tzpunkten}, series = {Bauingenieur}, volume = {100}, journal = {Bauingenieur}, number = {07-08}, publisher = {VDI Fachmedien}, address = {D{\"u}sseldorf}, issn = {0005-6650}, doi = {10.37544/0005-6650-2025-07-08-48}, pages = {214 -- 221}, abstract = {Das ECF-Schienenbefestigungssystem wird bei festen Fahrbahnsystemen aus Stahl eingesetzt, bei denen ein H{\"o}henausgleich durch aufgeschweißte und in Vergussmaterial eingebettete Gewindebolzen erfolgt. Unter außerplanm{\"a}ßig hoher Beanspruchung k{\"o}nnen Teilabrisse oder Komplettabrisse dieser Bolzen auftreten. Zur Erkennung eines Abrisses unter laufendem Verkehr bedarf es einer robusten Pr{\"u}fmethode. Im Rahmen der vorliegenden Untersuchung wurde eine sensorbasierte, transiente Thermografie zur kontinuierlichen {\"U}berwachung der Aufschweißbolzen entwickelt und bewertet. Die Methode basiert auf der gezielten Erw{\"a}rmung des Bolzenkopfes durch eine Heizpatrone und der Erfassung der resultierenden W{\"a}rmeausbreitung in der Grundplatte. Durch schrittweises Einschneiden der Bolzen konnten charakteristische Temperaturgradienten erzeugt werden, die eine differenzierte Identifikation von Teilabrissen und Abl{\"o}sungen erm{\"o}glichen. Die methodische Einfachheit, Robustheit und Kosteneffizienz der eingesetzten Sensorik pr{\"a}destinieren die Methode f{\"u}r diesen Anwendungsfall, weshalb sie auch aktuell an einer Eisenbahn{\"u}berf{\"u}hrung eingesetzt wird.}, subject = {Bolzen}, language = {de} } @article{SerhalPenaOlarteMiraeietal., author = {Serhal, Rafeek and Pe{\~n}a-Olarte, Andr{\´e}s Alfonso and Miraei, Mohsen and Schorr, Joshua and Wiegel, Andreas}, title = {Deterministic versus random finite element analysis of tunnel response}, series = {Geotechnical and Geological Engineering : an international journal}, volume = {44}, journal = {Geotechnical and Geological Engineering : an international journal}, publisher = {Springer Science + Business Media B.V}, address = {Dordrecht}, issn = {0960-3182}, doi = {10.1007/s10706-025-03512-5}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:525-37584}, pages = {16}, abstract = {In geotechnical engineering, the heterogeneity and variability of soil properties can pose a significant challenge for the design and construction of structures. This often-complex subsurface environment is generally represented by simplified homogeneous subsoil models derived from in-situ soundings and boreholes. However, these models do not consider the natural variability of the subsoil and the related uncertainties and, as such, disregard their influence on the design of geotechnical structures. Geostatistical models can be used to capture the inherent spatial subsoil variability by generating random fields (equiprobable realizations). The Random Finite Element Method (RFEM) is an approach that can be used to investigate the influence of soil variability (random fields) on the design of geotechnical structures. In this study, the technical implementation of the RFEM and its application for a twin tunnel case study in Munich (Germany) were examined. The influence of unexpected geological conditions was conducted within a probabilistic framework with the aim of comparing the results with the deterministic approach (idealized subsoil model). A conventional sensitivity analysis of soil variability was also performed. The results of this study demonstrate that deterministic approaches alone cannot adequately characterize tunneling-induced ground and foundation responses in heterogeneous subsoil conditions. Incorporating subsoil variability through RFEM provides a more realistic assessment, enabling engineers to better quantify risk, identify critical settlement zones, and ultimately improve the reliability of tunnel design.}, subject = {Boden-Bauwerk-Wechselwirkung}, language = {en} }