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《Journal of Beijing Jiaotong University》 2009-04
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Seismic Response Analysis of Large-Span Gate-Type Tube Truss Structures Under Multi-Support Excitation

JIANG Yang1,SHI Yongjiu1,WANG Yuanqing1,ZHANG Yong2(1.Key Laboratory of Structural Engineering and Vibration of Education Ministry,Tsinghua University,Beijing 100084,China;2.School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)  
Viewing the inconsistency of earthquake ground motions of structural bases for large span structures,it is necessary to take the multi-support excitation into account.A typical large span Gate-type Tube Truss is taken as an example to investigate the seismic response properties of the structure form under horizontal and vertical multi-support excitation considering the wave-passage effect via time-history method.The results show that(1) the difference between multi-support and uniform excitation is primarily attributed to the different excited modes,which are horizontal symmetric modes under horizontal earthquake while vertical antisymmetric modes under vertical earthquake;(2) more wave velocities are proposed to be employed to obtain reliable results since they have a strong influence on the seismic response;(3) for the upper and lower parts of the structure,the parts with smaller stiffness are more sensitive to the multi-support excitation;(4) under horizontal multi-support excitations,the internal forces of elements near the centre of truss beam differed greatly from the counterpart under uniform excitation,and so did the elements near the end of truss beam under vertical multi-support excitations.
【Fund】: 长江学者和创新团队发展计划资助(IRT00736)
【CateGory Index】: TU392.3;TU311.3
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