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《Earthquake Engineering and Engineering Vibration》 2006-04
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Determination of critical gap length of seismic pounding for bridges based on random vibration theory

Li Zhongxian~(1),Yue Fuqing~(1),Zhou Li~(1),Liu Xukai~(2)(1.Tianjin University,Tianjin 300072,China;2.Tianjin Municipal Engineering Design Institute,Tianjin 300051,China)  
Determining the critical gap length between adjacent spans to avoid pounding has great significance to pounding risk prediction and designing methods to prevent pounding.In this paper,the method to calculate critical gap length is founded based on random vibration theory.A two span simple supported bridge with different span lengths is taken as an analyzing model,and the nonlinear restoring force of seismic isolation bearing is also considered. Systems' nonlinear equations of motion are set up firstly,and then linearized by stochastic equivalent linearization method.The mean and standard deviation of the critical gap length are obtained in the complex modal space.The proposed method is verified by the results of nonlinear time history analysis using artificial ground motions.Parametric study shows that critical gap length increases with increasing the length ratio between adjacent girders,with decreasing the ratio of bearing's yield force to superstructure's weight,with increasing bearing's yield displacement and with increasing piers' natural periods.The bearing's post-yield to pre-yield stiffness ratio has little influence on critical gap length.
【Fund】: 国家杰出青年科学基金项目(50425824);; 天津市应用基础研究计划项目(05YFJMJC10900)
【CateGory Index】: U441.3
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