Dokument-ID Dokumenttyp Verfasser/Autoren Herausgeber Haupttitel Abstract Auflage Verlagsort Verlag Erscheinungsjahr Seitenzahl Schriftenreihe Titel Schriftenreihe Bandzahl ISBN Quelle der Hochschulschrift Konferenzname Quelle:Titel Quelle:Jahrgang Quelle:Heftnummer Quelle:Erste Seite Quelle:Letzte Seite URN DOI Abteilungen
OPUS4-3859 unpublished Radmard Rahmani, Hamid; Könke, Carsten Passive Control of Tall Buildings Using Distributed Multiple Tuned Mass Dampers The vibration control of the tall building during earthquake excitations is a challenging task due to their complex seismic behavior. This paper investigates the optimum placement and properties of the Tuned Mass Dampers (TMDs) in tall buildings, which are employed to control the vibrations during earthquakes. An algorithm was developed to spend a limited mass either in a single TMD or in multiple TMDs and distribute them optimally over the height of the building. The Non-dominated Sorting Genetic Algorithm (NSGA - II) method was improved by adding multi-variant genetic operators and utilized to simultaneously study the optimum design parameters of the TMDs and the optimum placement. The results showed that under earthquake excitations with noticeable amplitude in higher modes, distributing TMDs over the height of the building is more effective in mitigating the vibrations compared to the use of a single TMD system. From the optimization, it was observed that the locations of the TMDs were related to the stories corresponding to the maximum modal displacements in the lower modes and the stories corresponding to the maximum modal displacements in the modes which were highly activated by the earthquake excitations. It was also noted that the frequency content of the earthquake has significant influence on the optimum location of the TMDs. 43 urn:nbn:de:gbv:wim2-20190311-38597 10.25643/bauhaus-universitaet.3859 Institut für Strukturmechanik
OPUS4-3565 Wissenschaftlicher Artikel Nguyen-Tuan, Long; Könke, Carsten; Bettzieche, Volker; Lahmer, Tom Numerical modeling and validation for 3D coupled-nonlinear thermo-hydro-mechanical problems in masonry dams Numerical modeling and validation for 3D coupled-nonlinear thermo-hydro-mechanical problems in masonry dams 11 Computers & Structures 143 154 Institut für Strukturmechanik
OPUS4-3570 Wissenschaftlicher Artikel Lahmer, Tom; Nguyen-Tuan, Long; Könke, Carsten; Bettzieche, Volker Thermo-hydro-mechanische 3-D-Simulation von Staumauern-Modellierung und Validierung Thermo-hydro-mechanische 3-D-Simulation von Staumauern-Modellierung und Validierung 3 WASSERWIRTSCHAFT 27 30 Institut für Strukturmechanik
OPUS4-3338 Wissenschaftlicher Artikel Luu, M.; Martinez-Rodrigo, M.D.; Zabel, Volkmar; Könke, Carsten H∞ optimization of fluid viscous dampers for reducing vibrations of high-speed railway bridges H∞ optimization of fluid viscous dampers for reducing vibrations of high-speed railway bridges 21 Journal of Sound and Vibration 2421 2442 Institut für Strukturmechanik
OPUS4-3416 Konferenzveröffentlichung Hatahet, Tareq; Könke, Carsten Rational Framework for Probability of Collapse in Buildings Rational Framework for Probability of Collapse in Buildings Institut für Strukturmechanik
OPUS4-3417 Konferenzveröffentlichung Schwedler, Michael; Könke, Carsten Integrierte Tragwerksanalysen mittels Bauwerksinformationsmodellen und isogeometrischer FE-Methoden Integrierte Tragwerksanalysen mittels Bauwerksinformationsmodellen und isogeometrischer FE-Methoden 978-3-00-041256-1 Institut für Strukturmechanik
OPUS4-3350 Wissenschaftlicher Artikel Schrader, Kai; Könke, Carsten Distributed computing for the nonlinear analysis of multiphase composites Distributed computing for the nonlinear analysis of multiphase composites 12 Advances in Engineering Software 20 32 Institut für Strukturmechanik
OPUS4-1970 Konferenzveröffentlichung Theiler, Michael; Könke, Carsten Maia, Nuno Damping in Bolted Joints With the help of modern CAE-based simulation processes, it is possible to predict the dynamic behavior of fatigue strength problems in order to improve products of many industries, e.g. the building, the machine construction or the automotive industry. Amongst others, it can be used to improve the acoustic design of automobiles in an early development stage. Nowadays, the acoustics of automobiles plays a crucial role in the process of vehicle development. Because of the advanced demand of comfort and due to statutory rules the manufacturers are faced with the challenge of optimizing their car's sound emissions. The optimization includes not only the reduction of noises. Lately with the trend to hybrid and electric cars, it has been shown that vehicles can become too quiet. Thus, the prediction of structural and acoustic properties based on FE-simulations is becoming increasingly important before any experimental prototype is examined. With the state of the art, qualitative comparisons between different implementations are possible. However, an accurate and reliable quantitative prediction is still a challenge. One aspect in the context of increasing the prediction quality of acoustic (or general oscillating) problems - especially in power-trains of automobiles - is the more accurate implementation of damping in joint structures. While material damping occurs globally and homogenous in a structural system, the damping due to joints is a very local problem, since energy is especially dissipated in the vicinity of joints. This paper focusses on experimental and numerical studies performed on a single (extracted) screw connection. Starting with experimental studies that are used to identify the underlying physical model of the energy loss, the locally influencing parameters (e.g. the damping factor) should be identified. In contrast to similar research projects, the approach tends to a more local consideration within the joint interface. Tangential stiffness and energy loss within the interface are spatially distributed and interactions between the influencing parameters are regarded. As a result, the damping matrix is no longer proportional to mass or stiffness matrix, since it is composed of the global material damping and the local joint damping. With this new approach, the prediction quality can be increased, since the local distribution of the physical parameters within the joint interface corresponds much closer to the reality. 8 Proceedings of International Conference on Structural Engineering Dynamics (ICEDyn) 2013 978-989-96276-4-2 urn:nbn:de:gbv:wim2-20130701-19709 10.25643/bauhaus-universitaet.1970 Institut für Strukturmechanik
OPUS4-2758 Konferenzveröffentlichung Ahmad, Sofyan; Zabel, Volkmar; Könke, Carsten WAVELET-BASED INDICATORS FOR RESPONSE SURFACE MODELS IN DAMAGE IDENTIFICATION OF STRUCTURES In this paper, wavelet energy damage indicator is used in response surface methodology to identify the damage in simulated filler beam railway bridge. The approximate model is addressed to include the operational and surrounding condition in the assessment. The procedure is split into two stages, the training and detecting phase. During training phase, a so-called response surface is built from training data using polynomial regression and radial basis function approximation approaches. The response surface is used to detect the damage in structure during detection phase. The results show that the response surface model is able to detect moderate damage in one of bridge supports while the temperatures and train velocities are varied. 14 Digital Proceedings, International Conference on the Applications of Computer Science and Mathematics in Architecture and Civil Engineering : July 04 - 06 2012, Bauhaus-University Weimar urn:nbn:de:gbv:wim2-20170306-27588 10.25643/bauhaus-universitaet.2758 Institut für Strukturmechanik
OPUS4-3399 Wissenschaftlicher Artikel Schrader, Kai; Könke, Carsten Hybrid computing models for large-scale heterogeneous 3d microstructures Hybrid computing models for large-scale heterogeneous 3d microstructures 12 International Journal for Multiscale Computational Engineering 365 377 Institut für Strukturmechanik
OPUS4-3403 Wissenschaftlicher Artikel Luther, Torsten; Könke, Carsten Coupled cohesive zone representations from 3D quasicontinuum simulation on aluminum grain boundaries Coupled cohesive zone representations from 3D quasicontinuum simulation on aluminum grain boundaries International Journal for Multiscale Computational Engineering Institut für Strukturmechanik
OPUS4-3404 Wissenschaftlicher Artikel Könke, Carsten; Eckardt, Stefan; Häfner, Stefan; Luther, Torsten; Unger, Jörg F. Multiscale simulation methods in damage prediction of brittle and ductile materials Multiscale simulation methods in damage prediction of brittle and ductile materials 19 International Journal for Multiscale Computational Engineering 17 36 Institut für Strukturmechanik
OPUS4-3405 Wissenschaftlicher Artikel Nasser, Mourad; Schwedler, Michael; Wuttke, Frank; Könke, Carsten Seismic analysis of structural response using simplified soil-structure interaction models Seismic analysis of structural response using simplified soil-structure interaction models Bauingenieur, D-A-CH-Mitteilungsblatt Institut für Strukturmechanik
OPUS4-3589 Wissenschaftlicher Artikel Lahmer, Tom; Könke, Carsten; Bettzieche, Volker Optimale Positionierung von Messeinrichtungen an Staumauern zur Bauwerksüberwachung Optimale Positionierung von Messeinrichtungen an Staumauern zur Bauwerksüberwachung 0 WASSERWIRTSCHAFT 16 16 Institut für Strukturmechanik
OPUS4-3590 Wissenschaftlicher Artikel Lahmer, Tom; Könke, Carsten; Bettzieche, Volker Optimal positioning of sensors for the monitoring of water dams Optimal positioning of sensors for the monitoring of water dams 3 WASSERWIRTSCHAFT 16 19 Institut für Strukturmechanik
OPUS4-2898 Konferenzveröffentlichung Unger, Jörg F.; Könke, Carsten Gürlebeck, Klaus; Könke, Carsten PARAMETER IDENTIFICATION OF MESOSCALE MODELS FROM MACROSCOPIC TESTS USING BAYESIAN NEURAL NETWORKS In this paper, a parameter identification procedure using Bayesian neural networks is proposed. Based on a training set of numerical simulations, where the material parameters are simulated in a predefined range using Latin Hypercube sampling, a Bayesian neural network, which has been extended to describe the noise of multiple outputs using a full covariance matrix, is trained to approximate the inverse relation from the experiment (displacements, forces etc.) to the material parameters. The method offers not only the possibility to determine the parameters itself, but also the accuracy of the estimate and the correlation between these parameters. As a result, a set of experiments can be designed to calibrate a numerical model. 5 urn:nbn:de:gbv:wim2-20170314-28984 10.25643/bauhaus-universitaet.2898 Institut für Strukturmechanik
OPUS4-2841 Konferenzveröffentlichung Eckardt, Stefan; Könke, Carsten Gürlebeck, Klaus; Könke, Carsten ENERGY RELEASE CONTROL FOR NONLINEAR MESOSCALE SIMULATIONS In nonlinear simulations the loading is, in general, applied in an incremental way. Path-following algorithms are used to trace the equilibrium path during the failure process. Standard displacement controlled solution strategies fail if snap-back phenomena occur. In this contribution, a path-following algorithm based on the dissipation of the inelastic energy is presented which allows for the simulation of snap-backs. Since the constraint is defined in terms of the internal energy, the algorithm is not restricted to continuum damage models. Furthermore, no a priori knowledge about the final damage distribution is required. The performance of the proposed algorithm is illustrated using nonlinear mesoscale simulations. 5 urn:nbn:de:gbv:wim2-20170314-28414 10.25643/bauhaus-universitaet.2841 Institut für Strukturmechanik
OPUS4-2848 Konferenzveröffentlichung Häfner, Stefan; Vogel, Frank; Könke, Carsten Gürlebeck, Klaus; Könke, Carsten FINITE ELEMENT ANALYSIS OF TORSION FOR ARBITRARY CROSS-SECTIONS The present article proposes an alternative way to compute the torsional stiffness based on three-dimensional continuum mechanics instead of applying a specific theory of torsion. A thin, representative beam slice is discretized by solid finite elements. Adequate boundary conditions and coupling conditions are integrated into the numerical model to obtain a proper answer on the torsion behaviour, thus on shear center, shear stress and torsional stiffness. This finite element approach only includes general assumptions of beam torsion which are independent of cross-section geometry. These assumptions essentially are: no in-plane deformation, constant torsion and free warping. Thus it is possible to achieve numerical solutions of high accuracy for arbitrary cross-sections. Due to the direct link to three-dimensional continuum mechanics, it is possible to extend the range of torsion analysis to sections which are composed of different materials or even to heterogeneous beams on a high scale of resolution. A brief study follows to validate the implementation and results are compared to analytical solutions. 11 urn:nbn:de:gbv:wim2-20170314-28483 10.25643/bauhaus-universitaet.2848 Institut für Strukturmechanik
OPUS4-2887 Konferenzveröffentlichung Schrader, Kai; Könke, Carsten Gürlebeck, Klaus; Könke, Carsten SPARSE APPROXIMATE COMPUTATION OF SADDLE POINT PROBLEMS ARISING FROM FETI-DP DISCRETIZATION The numerical simulation of microstructure models in 3D requires, due to enormous d.o.f., significant resources of memory as well as parallel computational power. Compared to homogeneous materials, the material hetrogeneity on microscale induced by different material phases demand for adequate computational methods for discretization and solution process of the resulting highly nonlinear problem. To enable an efficient/scalable solution process of the linearized equation systems the heterogeneous FE problem will be described by a FETI-DP (Finite Element Tearing and Interconnecting - Dual Primal) discretization. The fundamental FETI-DP equation can be solved by a number of different approaches. In our approach the FETI-DP problem will be reformulated as Saddle Point system, by eliminating the primal and Lagrangian variables. For the reduced Saddle Point system, only defined by interior and dual variables, special Uzawa algorithms can be adapted for iteratively solving the FETI-DP saddle-point equation system (FETI-DP SPE). A conjugate gradient version of the Uzawa algorithm will be shown as well as some numerical tests regarding to FETI-DP discretization of small examples using the presented solution technique. Furthermore the inversion of the interior-dual Schur complement operator can be approximated using different techniques building an adequate preconditioning matrix and therewith leading to substantial gains in computing time efficiency. 12 urn:nbn:de:gbv:wim2-20170314-28874 10.25643/bauhaus-universitaet.2887 Institut für Strukturmechanik
OPUS4-3406 Wissenschaftlicher Artikel Luther, Torsten; Könke, Carsten Polycrystal models for the analysis of intergranular crack growth in metallic materials Polycrystal models for the analysis of intergranular crack growth in metallic materials 11 Engineering Fracture Mechanics 2332 2343 Institut für Strukturmechanik