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《Journal of Earthquake Engineering and Engineering Vibration》 2013-03
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Semi-analytical method for time-history responses of single column and mass systems used to seismic isolated regular bridges

CHEN Yangyang,TAN Ping,Wenliuhan.Heisha,ZHOU Fulin(Earthquake Engineering Research and Test Center,State Key Laboratory for Seismic Reduction,Control and Structural Safety(Cultivation),Guangzhou 510405,China)  
Based on the theory of continuous beam with distributed parameters and with boundary condiction of concentrated parameter,a solving procedure for time-history responses of single column and mass(SCM) systems used to seismic isolated regular bridge is developed.The equivalent foundation spring and the deformation compatibility conditions of the isolation layer at the column top are introduced to the governing equations.The real modes are given analytically,and the frequencies are calculated by the newton method.To handle the coupling effect of non-proportional damping problem,the additional damping of the seismic isolation layer is redistributed to each real mode and thus the system real modal decoupling is derived approximately.Then the mode superposition method can be introduced for solving the time-history response.Finally,the present procedure is applied to study the seismic response of SCM system used to a seismic isolated regular bridge.The comparison with numerical result by the finite element method shows the effectivity of the present method.The solutions also make clear that the structural response can be significantly reduced.Therefore,the seismic isolation strategy at pier top for SCM system shows considerable seismic reduction effectiveness.
【Fund】: 973国家重点基础研究发展计划项目(2011CB013606);; 国家自然科学基金青年项目(11102045);; 广东省自然科学基金博士启动项目(S2011040004039);; 广东省高校优秀青年创新人才培育项目(LYM10108);; 广州市高校科研项目一般项目(10A024)
【CateGory Index】: U442.55
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