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 OPUS4-3398 Wissenschaftlicher Artikel Brehm, Maik; Zabel, Volkmar; Bucher, Christian Optimal reference sensor positions for applications in model updating using output-only vibration test data based on random excitation: Part 2 - improved search strategy and experimental case study Optimal reference sensor positions for applications in model updating using output-only vibration test data based on random excitation: Part 2 - improved search strategy and experimental case study Mechanical Systems and Signal Processing Institut für Strukturmechanik (ISM) OPUS4-2831 Konferenzveröffentlichung Bombasaro, Emanuel; Bucher, Christian Gürlebeck, Klaus; Könke, Carsten INVESTIGATION OF MODELING ERRORS OF DIFFERENT RANDOM FIELD BASED WIND LOAD FORMULATIONS In this paper the influence of changes in the mean wind velocity, the wind profile power-law coefficient, the drag coefficient of the terrain and the structural stiffness are investigated on different complex structural models. This paper gives a short introduction to wind profile models and to the approach by Davenport A. G. to compute the structural reaction of wind induced vibrations. Firstly with help of a simple example (a skyscraper) this approach is shown. Using this simple example gives the reader the possibility to study the variance differences when changing one of the above mentioned parameters on this very easy example and see the influence of different complex structural models on the result. Furthermore an approach for estimation of the needed discretization level is given. With the help of this knowledge the structural model design methodology can be base on deeper understanding of the different behavior of the single models. 11 urn:nbn:de:gbv:wim2-20170314-28318 10.25643/bauhaus-universitaet.2831 Graduiertenkolleg 1462 OPUS4-3402 Wissenschaftlicher Artikel Brehm, Maik; Zabel, Volkmar; Bucher, Christian An automatic mode pairing strategy using an enhanced modal assurance citerion based on modal strain energies In the context of finite element model updating using output-only vibration test data, natural frequencies and mode shapes are used as validation criteria. Consequently, the correct pairing of experimentally obtained and numerically derived natural frequencies and mode shapes is important. In many cases, only limited spatial information is available and noise is present in the measurements. Therefore, the automatic selection of the most likely numerical mode shape corresponding to a particular experimentally identified mode shape can be a difficult task. The most common criterion for indicating corresponding mode shapes is the modal assurance criterion. Unfortunately, this criterion fails in certain cases and is not reliable for automatic approaches. In this paper, the purely mathematical modal assurance criterion will be enhanced by additional physical information from the numerical model in terms of modal strain energies. A numerical example and a benchmark study with experimental data are presented to show the advantages of the proposed energy-based criterion in comparison to the traditional modal assurance criterion. 17 Journal of Sound and Vibration 5375 5392 10.1016/j.jsv.2010.07.006 Institut für Strukturmechanik (ISM) OPUS4-2833 Konferenzveröffentlichung Brehm, Maik; Zabel, Volkmar; Bucher, Christian; Ribeiro, D. Gürlebeck, Klaus; Könke, Carsten AN AUTOMATIC MODE SELECTION STRATEGY FOR MODEL UPDATING USING THE MODAL ASSURANCE CRITERION AND MODAL STRAIN ENERGIES In the context of finite element model updating using vibration test data, natural frequencies and mode shapes are used as validation criteria. Consequently, the order of natural frequencies and mode shapes is important. As only limited spatial information is available and noise is present in the measurements, the automatic selection of the most likely numerical mode shape corresponding to a measured mode shape is a difficult task. The most common criterion to indicate corresponding mode shapes is the modal assurance criterion. Unfortunately, this criterion fails in certain cases. In this paper, the pure mathematical modal assurance criterion will be enhanced by additional physical information of the numerical model in terms of modal strain energies. A numerical example and a benchmark study with real measured data are presented to show the advantages of the enhanced energy based criterion in comparison to the traditional modal assurance criterion. 18 urn:nbn:de:gbv:wim2-20170314-28330 10.25643/bauhaus-universitaet.2833 Institut für Strukturmechanik (ISM) OPUS4-3411 Wissenschaftlicher Artikel Most, Thomas; Bucher, Christian New concepts for moving least squares: An interpolating non-singular weighting function and weighted nodal least squares New concepts for moving least squares: An interpolating non-singular weighting function and weighted nodal least squares 9 Engineering Analysis with Boundary Elements 461 470 Institut für Strukturmechanik (ISM) OPUS4-3408 Wissenschaftlicher Artikel Bucher, Christian; Most, Thomas A comparison of approximate response functions in structural reliability analysis A comparison of approximate response functions in structural reliability analysis 9 Probabilistic Engineering Mechanics 154 163 Institut für Strukturmechanik (ISM) OPUS4-3445 Wissenschaftlicher Artikel Most, Thomas; Bucher, Christian Energy-based simulation of concrete cracking using an improved mixed-mode cohesive crack model within a meshless discretization Energy-based simulation of concrete cracking using an improved mixed-mode cohesive crack model within a meshless discretization 20 International Journal for Numerical and Analytical Methods in Geomechanics 285 305 Institut für Strukturmechanik (ISM) OPUS4-3444 Wissenschaftlicher Artikel Most, Thomas; Bucher, Christian Probabilistic analysis of concrete cracking using neural networks and random fields Probabilistic analysis of concrete cracking using neural networks and random fields 10 Probabilistic Engineering Mechanics 219 229 Institut für Strukturmechanik (ISM) OPUS4-3459 Wissenschaftlicher Artikel Bucher, Christian; Frangopol, D.M. Optimization of lifetime maintenance strategies for deteriorting structures considering probabilities of violating safety, condition, and cost thresholds Optimization of lifetime maintenance strategies for deteriorting structures considering probabilities of violating safety, condition, and cost thresholds 7 Probabilistic Engineering Mechanics 1 8 Institut für Strukturmechanik (ISM) OPUS4-3462 Wissenschaftlicher Artikel Most, Thomas; Bucher, Christian Stochastic simulation of cracking in concrete structures using multi-parameter random fields Stochastic simulation of cracking in concrete structures using multi-parameter random fields 19 International Journal of Reliability and Safety 168 187 Institut für Strukturmechanik (ISM) OPUS4-3483 Wissenschaftlicher Artikel Bucher, Christian; Pham, Hoang Anh On model updating of existing structures utilizing measured dynamic responses On model updating of existing structures utilizing measured dynamic responses 8 Structure and Infrastructure Engineering 135 143 Institut für Strukturmechanik (ISM) OPUS4-3484 Wissenschaftlicher Artikel Most, Thomas; Bucher, Christian A moving least squares weighting function for the element-free Galerkin method which almost fulfills essential boundary conditions A moving least squares weighting function for the element-free Galerkin method which almost fulfills essential boundary conditions 17 Structural Engineering and Mechanics 315 332 Institut für Strukturmechanik (ISM) OPUS4-3502 Wissenschaftlicher Artikel Most, Thomas; Bucher, Christian; Schorling, York Dynamic stability analysis of non-linear structures with geometrical imperfections under random loading Dynamic stability analysis of non-linear structures with geometrical imperfections under random loading 19 Journal of Sound and Vibration 381 400 Institut für Strukturmechanik (ISM) OPUS4-3514 Wissenschaftlicher Artikel Kirichuk, A.; Most, Thomas; Bucher, Christian Numerical nonlinear analysis of kinematically excited shells Numerical nonlinear analysis of kinematically excited shells 13 International Journal for Computational Civil and Structural Engineering 61 74 Institut für Strukturmechanik (ISM) OPUS4-3526 Wissenschaftlicher Artikel Bucher, Christian; Ebert, Matthias Nichtlineare Berechnung von Stahlflanschverbindungen mit gemessenen Imperfektionen Nichtlineare Berechnung von Stahlflanschverbindungen mit gemessenen Imperfektionen 6 Stahlbau 516 522 Institut für Strukturmechanik (ISM)