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《Journal of the China Railway Society》 2006-02
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Mode-based Push-over Method Applied to Aseismatic Analysis of Bridges

WANG Ke-hai,LI Qian(Research Institute of Highway,the Ministry of Communications,Beijing 100088,China)  
Nonlinear time-history analysis is a more rigorous method to estimate seismic response of structure.Because of large workload and complex procedure,at present,Push-over analysis is used widely.Uniform force distribution and triangular force distribution are suitable for the rigid structures or structures whose 1st-mode is main,In order to consider the effects of the high modes,Push-over method based on mode analysis is given in this paper and applied to aseismatic analysis of bridges.This method that put forward in this paper needs to analysis the dynamic characteristics of the structures,especially mode contribution ratio.Based on the main mode shapes that the mode contribution ratios are higher than expected and the principia that distribution of the lateral forces should be in accordance with the inertial distribution in the earthquake as far as possible,the distribution of the lateral load corresponding to the each selected mode shape according to the equation specified in The Highway Engineering Seismic Design Specifications(JTJ 004-89).In this paper,evaluating aseismatic performance of the bridge is done by using mode-based Push-over method.The results indicate that combining modes selected and combining all modes accord with each other.The method that is gotten lateral forces by analyzing the modal contribution ratios to do Push-over analysis not only considers the high modes effect,but also avoids the disturbing of the secondary modes,so it's a available method to estimate the aseismic capacity of the bridges.
【Fund】: 西部交通建设科技项目(200231800028)
【CateGory Index】: U441.3
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