7.2 Ingenieurbau
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Erscheinungsjahr
- 2018 (57) (entfernen)
Dokumenttyp
Schlagworte
- Monitoring (4)
- Repair (4)
- Box-Behnken (3)
- Fatigue (3)
- Grouting (3)
- Interface (3)
- Offshore (3)
- SHM (3)
- Statistical tests (3)
- Acoustic emission testing (2)
- Amplitude-charge weight laws (2)
- Amplitude-distance laws (2)
- Analysis of variance (2)
- Big Data (2)
- Bitumen (2)
- Compressive cyclic loading (2)
- Compressive strength (2)
- Cracks (2)
- DUCON® (2)
- Datenmanagement (2)
- Ductility (2)
- E-modulus (2)
- Elastische Gebäudelagerung (2)
- Energy (2)
- Explosion-induced ground vibrations (2)
- Fault detection (2)
- Grouted Connection (2)
- Hammer impact (2)
- High-strength concrete (2)
- Impact (2)
- Micro-reinforcement (2)
- Mix design (2)
- Mobile elements (2)
- Non-destructive testing (2)
- Numerical model (2)
- Numerical modeling (2)
- Numerical modelling (2)
- Offshore-Windenergieanlagen (2)
- Prediction of explosion induced ground and building vibration (2)
- Quasi-static and dynamic tests (2)
- Rechenmodelle (2)
- Rehabilitation (2)
- Residual evaluation (2)
- Schadensdetektion (2)
- Schwingungsbasierte Verfahren (2)
- Size effect (2)
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- Soil properties (2)
- Soil-structure interaction (2)
- Stereo photogrammetry (2)
- Structural Health Monitoring (2)
- Structural health monitoring (2)
- Supplementary cementitious materials (2)
- Track damage (2)
- UHPC (2)
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- Unterraummethoden (2)
- Vibration measurements (2)
- Windenergie (2)
- 3D imaging (1)
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- Bayes'sche Analyse (1)
- Beanspruchungszustand (1)
- Betonautobahn (1)
- Betonautobahnen (1)
- Boundary element method (1)
- Bridge (1)
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- Cohesive soils (1)
- Compaction Grouting (1)
- Compaction grouting (1)
- Conductor (1)
- Crack (1)
- Crack detection (1)
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- Cyclic axial shearing (1)
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- Finite-Elemente-Modellkalibrierung (1)
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- GPA (1)
- GPU parallelisation (1)
- Geology (1)
- Geomechanics (1)
- Geomechanics of offshore foundations (1)
- Ground vibration measurements (1)
- Grout (1)
- Grout Injection (1)
- HTLS (1)
- Imperfektion (1)
- Innovative Messtechnik (1)
- Inspection planning (1)
- Interface model (1)
- Jet erosion test (1)
- LBM-DEM simulation (1)
- Laminography (1)
- Load bearing behaviour (1)
- Luminescence (1)
- Material Point Method (1)
- Material Point Method (MPM) (1)
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- Messen im Bauwesen (1)
- Metakaolin (1)
- Microfine cement (1)
- Micromechanical LBM-DEM simulation (1)
- Microsilica (1)
- Mixed formulation (1)
- Offshore Pile Foundation (1)
- Offshore pile foundation (1)
- Offshore pile foundations (1)
- Offshore wind energy (1)
- Offshore wind farms (1)
- Offshore-Wind (1)
- Optimierungsmethoden (1)
- Optimization techniques (1)
- Physical phenomenology (1)
- Piaui state (1)
- Pile Capacity (1)
- Pile foundations (1)
- Pressure (1)
- Probabilitische Ingenieurmodelle (1)
- Randelementmethode (1)
- Recovery experiments (1)
- Reinforced concrete (1)
- Reliability (1)
- Risiko (1)
- Risikoanalyse (1)
- Risk (1)
- Risslumineszenz (1)
- Sandstone (1)
- Santa-marta (1)
- Schrauben (1)
- Schwingungsmessungen (1)
- Serra da cangalha (1)
- Shearing (1)
- Shrinkage (1)
- Soil erosion (1)
- Soil-pile interaction (1)
- State of stress (1)
- Statistical pattern recognition (1)
- Steel structures (1)
- Strength (1)
- Subspace methods (1)
- Subspace-based method (1)
- TOP (1)
- Temperature effect (1)
- Track vibration (1)
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- Wave-Tower interaction (1)
- Wellenfeldberechnung (1)
- Windenergieanlage (1)
- Windfarm wake analysis (1)
- Workability (1)
- Zivile Sicherheit (1)
- fachwerkartige Stahltragwerken (1)
- temperature (1)
Organisationseinheit der BAM
- 7.2 Ingenieurbau (57) (entfernen)
Eingeladener Vortrag
- nein (29)
Cerro do Jarau is a conspicuous, circular morpho‐structural feature in Rio Grande do Sul State (Brazil), with a central elevated core in the otherwise flat “Pampas” terrain typical for the border regions between Brazil and Uruguay. The structure has a diameter of approximately 13.5 km. It is centered at 30o12′S and 56o32′W and was formed on basaltic flows of the Cretaceous Serra Geral Formation, which is part of the Paraná‐Etendeka Large Igneous Province (LIP), and in sandstones of the Botucatu and Guará formations. The structure was first spotted on aerial photographs in the 1960s. Ever since, its origin has been debated, sometimes in terms of an endogenous (igneous) origin, sometimes as the result of an exogenous (meteorite impact) event. In recent years, a number of studies have been conducted in order to investigate its nature and origin. Although the results have indicated a possible impact origin, no conclusive evidence could be produced. The interpretation of an impact origin was mostly based on the morphological characteristics of the structure; geophysical data; as well as the occurrence of different breccia types; extensive deformation/silicification of the rocks within the structure, in particular the sandstones; and also on the widespread occurrence of low‐pressure deformation features, including some planar fractures (PFs). A detailed optical microscopic analysis of samples collected during a number of field campaigns since 2007 resulted in the disclosure of a large number of quartz grains from sandstone and monomict arenite breccia from the central part of the structure with PFs and feather features (FFs), as well as a number of quartz grains exhibiting planar deformation features (PDFs). While most of these latter grains only carry a single set of PDFs, we have observed several with two sets, and one grain with three sets of PDFs. Consequently, we here propose Cerro do Jarau as the seventh confirmed impact structure in Brazil. Cerro do Jarau, together with Vargeão Dome (Santa Catalina state) and Vista Alegre (Paraná State), is one of very few impact structures on Earth formed in basaltic rocks.
We examine the behavior of reinforced concrete components subjected to impact induced loading conditions which might be caused by vessels collisions such as aircraft fuel tanks The concrete plates were impact damaged at TU Dresden and shipped to BAM At BAM laminar tomography as the imaging method is used to determine and quantify the damage state An automatic crack detection method based on template matching is applied to find the cracks and we aim to develop a new method using machine learning Algorithms In addition numerical models are developed to understand the experiment and to predict the damage structures based on failure mechanisms.
The governing load bearing mechanism of multi-pile foundations is often the shaft friction. Under cyclic loading the soil particles next to the foundation rearrange and tend to compact leading to a decrease of the surrounding normal stress. The reduction of the normal stress leads to a lower threshold for shear stress (friction fatigue), which results in a degraded shaft bearing capacity. The common interface models used for numerical simulations (e.g. Mohr-Coulomb) are not able to capture such behavior. This work aims to develop an interface material model that incorporates such features of the contact behavior at the soil-structure interface.
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 interface elements and adequate constitutive models. In this work, a constitutive model in the framework of Generalized 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.
The response of many geotechnical systems, whose structural behavior depends on granular friction and a shearing effect with the ground, is characterized by a complex soil-structure interaction at their interfaces. Experimentally it is found that this interaction is highly non-linear, state-dependent and localized within a narrow layer of soil next to the structure, whereby cyclic loads can play a key role. Numerically, this behavior is often modelled with overly simplified models of interface elements that neglect cyclic effects within the soil. This work introduces a new perspective with an adequate constitutive model in the framework of Generalized Plasticity for sandy soils for an improved consideration of the interface mechanics.
Risslumineszenz
(2018)
Unterraumbasierte Detektion von Strukturschäden an Jacket-Gründungen von Offshore-Windenergieanlagen
(2018)
Die vorliegende Arbeit beschreibt die Adaption eines globalen, schwingungsbasierten Verfahrens zur frühzeitigen Erkennung von Strukturschäden an Gründungsstrukturen offshore installierter Windenergieanlagen (OWEA). Damit soll es, Betreibern von Offshore-Windparks ermöglicht werden, im Rahmen periodisch durchgeführter messtechnischer Überwachungsmaßnahmen mit einem gegenüber wiederkehrender Inspektionen wesentlich geringen Aufwand auftretende Schäden an der Struktur zuverlässig zu delektieren.
Das untersuchte und implementierte Verfahren basiert auf der Methode der stochastischen unterraumbasierten Schadensdetektion. Dabei erfolgt eine statistische Analyse des wiederkehrend messtechnisch aufgenommenen dynamischen Antwortverhaltens des mechanischen Systems. Mittels statistischem Test werden signifikante Änderungen in dessen Eigenstruktur und damit Schäden delektiert.
Im Rahmen der vorliegenden Arbeit wurden umfangreiche experimentelle als auch numerische Untersuchungen zur Sensitivität und Robustheit des beschriebenen Schadensindikators durchgeführt. Dazu sind zunächst an einem Labormodell mittels künstlich und reversibel eingebrachter Schäden grundlegende Analysen zu den Einflüssen signal- und verfahrensinhärenter Kenngrößen durchgeführt worden. Auf der Basis dieser Ergebnisse wurde im Anschluss mittels numerischer Analysen das Antwortverhalten von OWEA simuliert und der entwickelte Algorithmus zur Schadensdetektion an den so realisierten Datensätzen angewendet.
Anhand der Ergebnisse der Arbeit wird aufgezeigt, dass, vorausgesetzt die Windenergieanlage befindet sich in Parkposition, eine Detektion von schon geringen Schäden an Gründungs-strukturen mit dem beschriebenen Verfahren, auch unter Einsatz weniger Messaufnehmer, zuverlässig möglich ist.
Unterraumbasierte Detektion von Strukturschäden an Jacket-Gründungen von Offshore-Windenergieanlagen
(2018)
Die vorliegende Arbeit beschreibt die Adaption eines globalen, schwingungsbasierten Verfahrens zur frühzeitigen Erkennung von Strukturschäden an Gründungsstrukturen offshore installierter Windenergieanlagen (OWEA). Damit soll es, Betreibern von Offshore-Windparks ermöglicht werden, im Rahmen periodisch durchgeführter messtechnischer Überwachungsmaßnahmen mit einem gegenüber wiederkehrender Inspektionen wesentlich geringen Aufwand auftretende Schäden an der Struktur zuverlässig zu delektieren.
Das untersuchte und implementierte Verfahren basiert auf der Methode der stochastischen unterraumbasierten Schadensdetektion. Dabei erfolgt eine statistische Analyse des wiederkehrend messtechnisch aufgenommenen dynamischen Antwortverhaltens des mechanischen Systems. Mittels statistischem Test werden signifikante Änderungen in dessen Eigenstruktur und damit Schäden delektiert.
Im Rahmen der vorliegenden Arbeit wurden umfangreiche experimentelle als auch numerische Untersuchungen zur Sensitivität und Robustheit des beschriebenen Schadensindikators durchgeführt. Dazu sind zunächst an einem Labormodell mittels künstlich und reversibel eingebrachter Schäden grundlegende Analysen zu den Einflüssen signal- und verfahrensinhärenter Kenngrößen durchgeführt worden. Auf der Basis dieser Ergebnisse wurde im Anschluss mittels numerischer Analysen das Antwortverhalten von OWEA simuliert und der entwickelte Algorithmus zur Schadensdetektion an den so realisierten Datensätzen angewendet.
Anhand der Ergebnisse der Arbeit wird aufgezeigt, dass, vorausgesetzt die Windenergieanlage befindet sich in Parkposition, eine Detektion von schon geringen Schäden an Gründungs-strukturen mit dem beschriebenen Verfahren, auch unter Einsatz weniger Messaufnehmer, zuverlässig möglich ist.
Within the presented research project, experimental and numerical investigations were performed to develop a thin-shelled, modular, mobile element system made of a micro-reinforced ultra-high-performance ductile concrete (DUCON®). Material parameters were experimentally determined to adapt the material model within the numerical analysis applying the Drucker-Prager relationship. Afterwards, for validation of the numerical models, quasi-static and high-velocity impact tests were performed on plate-like structures. Finally, a suitable geometry of transportable barrier elements will be designed, which provides a maximum of resistance against impact by a minimum of weight and a maximum of mobility.
Within the presented research project, experimental and numerical investigations were performed to develop a thin-shelled, modular, mobile element system made of a micro-reinforced ultra-high-performance ductile concrete (DUCON®). Material parameters were experimentally determined to adapt the material model within the numerical analysis applying the Drucker-Prager relationship. Afterwards, for validation of the numerical models, quasi-static and high-velocity impact tests were performed on plate-like structures. Finally, a suitable geometry of transportable barrier elements will be designed, which provides a maximum of resistance against impact by a minimum of weight and a maximum of mobility.