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《Journal of Vibration and Shock》 2008-07
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HORIZONTAL PREDOMINANT VIBRATION MODES OF HIGH-PIER BEAM BRIDGES IN VIEW OF HIGHER-ORDER VIBRATION OF PIER SHAFTS

PENG Kai, LI Jian-zhong , FAN Li-chu(1. Department of Bridge Engineering, Tongji University, Shanghai 200092, China; 2. School of Civil Engineering and Architecture, Chongqing Jiaotong University, Chongqing 400074, China)  
In the case of high-pier beam bridges, different from the regular mediun-length-pier or short-pier beam bridges, due to the participation of pier column mass and influence of higher vibration modes in horizontal directions, the dynamically complex structure under seismic attack could not be effectively analyzed based on SDOF model any longer. To make a step further to understand the dynamic properties and seismic responses of high-pier beam bridges, a single-col-umn-and-mass (SCM) system as the simplified dynamic model for high-pier beam bridges is employed in consideration of the pier shaft mass participation as well as the higher vibration modes, to study the influences of system parameters including pier height, pier-top concentrative mass and beam to pier mass ratio on the distribution of horizontal predominant vibration modes. It shows that the beam to pier mass ratio is the dominant factors deciding the horizontal modal mass partici-pating coefficients of the SCM system and then the definite relations between them are formulated. The response spectrum method is applied to compute the pier-bottom seismic force and pier-top displacement of the SCM system under inputs from several different ground motion records. The significant modal contributions to system seismic responses are identified to form reasonable criteria for selection of the SCM system's horizontal predominant vibration modes according to diverse evaluation objectives.
【Fund】: 国家自然科学基金资助项目(50578118)
【CateGory Index】: U441.3
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