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《Journal of Vibration and Shock》 2007-01
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STOCHASTIC RESPONSE ANALYSIS OF SEISMICALLY ISOLATED BRIDGES WITH LRB TO SPATIALLY VARYING EARTHQUAKE GROUND MOTIONS

Jiang Yicheng,Yang Dexi,Li Li,Hu Liang(School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074)  
Considering spatial variability effects of ground motions,seismic responses analysis of a long-span continuous bridge wity lead-rubber-bearings(LRB) is conducted.The power spectral density function of ground acceleration can be described as filtered white noise applied on each support point.The spatial variability effects of earthquake ground motions including the incoherence,the wave-passage and the local site-response effects are taken into account.Equation of motion of LRB structures to multiple excitations is derived,the stochastic equivalent linearization method is used to(linearize) the equation of motion.Furthermore,a seismically isolated bridge with LRB is calculated in three cases under uniform excitation and multiple excitations.Mean values of the maximum quasi-static,dynamic and the total response in three cases are obtained and analysed.It is shown that in the stochastic analysis of longspan seismically isolated continuous bridges with LRB,multiple excitations should be included while uniform excitation may cause unsafe estimation.
【Fund】: 湖北省建设厅科技项目(K200553)
【CateGory Index】: U442.55
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