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Indexed by:会议论文

Date of Publication:2011-01-01

Included Journals:CPCI-S

Page Number:839-844

Key Words:Cable-stayed bridge; Finite element model updating; Scale model test

Abstract:A method of model updating for the cable-stayed bridge is proposed and the experimental verification is carried out by the scale-model test in the paper. Shengli Yellow-river Bridge is one of the longest cable-stayed bridges with steel main girder in China. For over 20-year service, the damages inevitably happened in the bridge due to over-speed as well as over-weight. To assess the structural states of the bridge, the Finite Element (FE) model updating was studied with the field measurements and the scale model tests. However, to the authors' knowledge, studies on the verification of the FE model updating rarely appear in the literature. Model test are useful to investigate the performance of the FE model updating if the results corresponding systematically to the real structure. Firstly, a novel method based on the multi-response objective function was proposed to update the finite element model for cable-stayed bridge. Secondly, a physical model, on a scale of 1:150, was built to satisfy the similitude with Shengli Yellow-river cable-stayed bridge, and both static and model tests were carried out in the laboratory. Finally, an FE model updating was performed with the experimental data, i.e. the deflections, natural frequencies and mode shapes. The results are shown as following: (1) the updated density is in a good agreement with the equivalent density; (2) the cable force changes obtained from the FE analysis were in a good agreement with the ones from the model test. It demonstrates the feasibility of the proposed method to update the FE model and assess the structural states for the cable-stayed bridge.