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
OPUS4-49290 Konferenzveröffentlichung Wu, Cheng-Chieh; Weisbrich, S.; Burger, M.; Neitzel, F. A Four-Point Bending Test Apparatus for Measurement- and Model-based Structural Analysis By means of a small-scale truss bridge, the ability of the Measurement- and Model-based Structural Analysis to detect and localize damage was examined. Although there was no noteworthy difficulty in detecting damage, it turned out that damage localization responds sensitively to systematic influences, i.e. non-modelled properties of the mechanical model. Therefore, another experiment is being conducted to re-examine the Measurement- and Model-based Structural Analysis. For this purpose, the bending test is carried out as it has been already theoretically respectively numerically discussed. In this attempt, the systematic influences such as residual stress are kept as low as possible. Pilsen, Czech Republic 1 36th Danubia Adria Symposium on Advances in Experimental Mechanics EXTENDED ABSTRACTS 978-80-261-0876-4 63 64 8 Zerstörungsfreie Prüfung
OPUS4-49291 misc Wu, Cheng-Chieh A Four-Point Bending Test Apparatus for Measurement- and Model-based Structural Analysis By means of a small-scale truss bridge, the ability of the Measurement- and Model-based Structural Analysis to detect and localize damage was examined. Although there was no noteworthy difficulty in detecting damage, it turned out that damage localization responds sensitively to systematic influences, i.e. non-modelled properties of the mechanical model. Therefore, another experiment is being conducted to re-examine the Measurement- and Model-based Structural Analysis. For this purpose, the bending test is carried out as it has been already theoretically respectively numerically discussed. In this attempt, the systematic influences such as residual stress are kept as low as possible. 8 Zerstörungsfreie Prüfung
OPUS4-48053 Wissenschaftlicher Artikel Wu, Cheng-Chieh; Weisbrich, S.; Neitzel, F.; Kadoke, Daniel; Fischer, Michael; Kohlhoff, Harald Pastramă, Ştefan Dan; Constantinescu, Dan Mihai A Small-Scale Test Bridge for Measurement and Model-based Structural Analysis The Measurement- and Model-based Structural Analysis (MeMoS) integrates a finite element model into least squares adjustment and thus allows to evaluate a mechanical model and measurements in a combined analysis. To examine the capability to detect and localise damage using this integrated analysis MeMoS, a small-scale truss bridge made of aluminium profiles is built as a test specimen for this purpose. Elsevier Ltd. 9 Materials Today: Proceedings 12 2 319 328 10.1016/j.matpr.2019.03.130 8 Zerstörungsfreie Prüfung
OPUS4-46116 Konferenzveröffentlichung Wu, Cheng-Chieh; Kadoke, Daniel; Fischer, Michael; Kohlhoff, Harald; Weisbrich, S.; Neitzel, F. Pastramă, Ştefan Dan; Constantinescu, Dan Mihai A small-scale test bridge for measurement- and model-based structural analysis To examine the capability to detect and localise damage using the Measurement- and Model-based Structural Analysis (MeMoS), a small-scale truss bridge (1520 mm × 720 mm × 720 mm) made of aluminium profiles is built as a test specimen for this purpose. The truss frame of the test bridge is made of aluminium profiles with a sophisticated design of the cross-sectional area. In comparison, with solid profiles, only a fraction of the material is needed to produce the profiles, while their bending resistance decreases slightly. The profiles are built into a truss frame by connecting them by means of fastening sets made of steel. The bridge model is mounted on four steel bearings which each of them consist of a cylinder arranged between two plates. Fixed bearings are made by holding onto one end of the bridge. The bridge is subjected by an external load by placing a heavy object beneath it. At the same time, measurements can be conducted below the bridge. Therefore, the bridge specimen is elevated by attaching it on a pedestal with four columns. Damages can be induced by loosening the fastening pieces. Bukarest PRINTECH 1 35TH DANUBIA ADRIA SYMPOSIUM ON ADVANCES IN EXPERIMENTAL MECHANICS Extended abstracts 978-606-23-0874-2 23 24 8 Zerstörungsfreie Prüfung
OPUS4-46113 misc Wu, Cheng-Chieh A small-scale test bridge for measurement- and model-based structural analysis To examine the capability to detect and localise damage using the Measurement- and Model-based Structural Analysis (MeMoS), a small-scale truss bridge (1520 mm × 720 mm × 720 mm) made of aluminium profiles is built as a test specimen for this purpose. The truss frame of the test bridge is made of aluminium profiles with a sophisticated design of the cross-sectional area. In comparison, with solid profiles, only a fraction of the material is needed to produce the profiles, while their bending resistance decreases slightly. The profiles are built into a truss frame by connecting them by means of fastening sets made of steel. The bridge model is mounted on four steel bearings which each of them consist of a cylinder arranged between two plates. Fixed bearings are made by holding onto one end of the bridge. The bridge is subjected by an external load by placing a heavy object beneath it. At the same time, measurements can be conducted below the bridge. Therefore, the bridge specimen is elevated by attaching it on a pedestal with four columns. Damages can be induced by loosening the fastening pieces. 8 Zerstörungsfreie Prüfung
OPUS4-42794 Wissenschaftlicher Artikel Wu, Cheng-Chieh; Weisbrich, S.; Neitzel, F. Emri, Igor Approximate model for geometrical complex structures Many engineering structures are nowadays made of composite materials or metal foam. These modern engineering materials contain very complex inner geometry. To simulate the deformational behaviour of these structures often requires a high number of discretisation elements. This in turn yields a very large system of linear equations that are extremely time and memory consuming or practically impossible to solve. It is therefore desirable to find an approach to overcome this obstacle. In this paper a numerical method is proposed to find an approximate substitute model for geometrical complex structures. Amsterdam, Netherlands Elsevier 5 Materials Today: Proceedings 4 5, Part 1 5995 6000 10.1016/j.matpr.2017.06.084 8 Zerstörungsfreie Prüfung
OPUS4-49288 Dissertation Wu, Cheng-Chieh The measurement- and model-based structural analysis for damage detection The present work is intended to make a contribution to the monitoring of civil engineering structures. The detection of damage to structures is based on the evaluation of spatially and temporally distributed hybrid measurements. The acquired data can be evaluated purely geometrically or physically. It is preferable to do the latter, since the cause of damage can be determined by means of geometrical-physical laws in order to be able to intervene in time and ensure the further use of the structures. For this reason, the continuum mechanical field equations in conjunction with the finite element method and hybrid measurements are combined into a single evaluation method by the adjustment calculation. This results in two challenges. The first task deals with the relationship between the finite element method and the method of least squares. The finite element method solves certain problem classes, which are described by a system of elliptical partial differential equations. Whereas the method of least squares solves another class of problems, which is formulated as an overdetermined system of equations. The striking similarity between both methods is known since many decades. However, it remains unresolved why this resemblance exists. The contribution is to clarify this by examining the variational calculus, especially with regard to its methodological procedure. Although the well-known Gauss-Markov model within the method of least squares and the finite element method solve inherently different problem classes, it is shown that both methods can be derived by following the same methodological steps of the variational calculus. From a methodical viewpoint, this implies that both methods are not only similar, but actually the same. In addition, it is pointed out where a possible cross-connection to other methods exists. The second task introduces a Measurement- and Model-based Structural Analysis (MeMoS) by integrating the finite element method into the adjustment calculation. It is shown in numerical examinations how this integrated analysis can be used for parameter identification of simple as well as arbitrarily shaped structural components. Based on this, it is examined with which observation types, with which precision and at which location of the structure these measurements must be carried out in order to determine the material parameters as precisely as possible. This serves to determine an optimal and economic measurement set-up. With this integrated analysis, a substitute model of a geometrically complex structure can also be determined. The issue of the detection and localisation of damage within a structure is studied by means of this structural analysis. The Measurement and Model-based Structural Analysis is validated using two different test setups, an aluminum model bridge and a bending beam. Berlin Technische Universität Berlin 168 1 169 urn:nbn:de:kobv:b43-492889 10.14279/depositonce-8845 8 Zerstörungsfreie Prüfung