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《Journal of Chongqing Jiaotong University(Natural Science)》 2008-05
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Influence of Under-Pylon Foundation Forms on Seismic Performance of Super-Span Cable-Stayed Bridges

PENG Kai1,2,LI Jian-zhong1,PENG Tian-bo1(1.Department of Bridge Engineering,Tongji University,Shanghai 200092,China;2.School of Civil Engineering & Architecture,Chongqing Jiaotong University,Chongqing 400074,China)  
Based on a super-span cable-stayed bridge over Yangtze River,which is planned with two optional pylon foundation forms: caisson and pile,modal participating mass ratio distribution and modal period distribution of free structural vibration modes involving distinct horizontal participation of the under-pylon huge-mass pile caps are studied by contrast.Artificial ground motions are applied in linear time-history analysis to calculate the controlling seismic responses of the bridge structure with caisson-form pylon foundations and alternative pile-form ones,then the results of the two cases are compared at the same structural locations;and in the horizontal directions the contribution of the under-pylon huge-mass pile caps to the cap bottom seismic reactions are analyzed in time domain as well as frequency domain.The research indicates that participation of the under-pylon huge-mass pile caps in high-order structural vibration modes essentially influences the dynamic properties and seismic responses of the super-span cable-stayed bridge,and sharply magnifies the horizontal seismic foundation reactions at the pylon cap bottoms compared with the case of caisson-form pylons foundations,which increases the seismic vulnerability of the super-span cable-stayed bridge.
【CateGory Index】: U442.55
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