SEISMIC RESPONSE ANALYSIS OF LONG-SPAN SEMI-SUPPORTED STEEL TRUSS ARCH BRIDGE
A seismic response analysis procedure of long-span bridges was established and programmed with spatial linear elastic finite element method. And two seismic ground motion modes, uniform excitation and multiplesupport seismic excitations and different seismic wave superpositions were considered. Through timehistory analysis method, the internal force and displacement response of semi-supported steel truss arch bridge under longitudinal excitation, transverse excitation, longitudinal-vertical excitation, transverse-vertical excitation were calculated. The influence of the arch ribs seismic response caused by different seismic wave superposition and different seismic ground motion modes was also discussed. The results show that, under uniform excitation, the maximal peak value of longitudinal displacement appears at the 1/4 of the center span, the peak value of element internal force appears around the left foot arch of the lower arch rib, and the vertical excitation has considerable influence on the internal force and displacement response of the structure. Besides, under multiple-support excitations, the internal force response of long-span bridge is more serious than that of under uniform excitation. It also can be found that the influence of longitudinal multiple-support excitation on the structure response is more predominant than the transverse multiplesupport excitation. These analyses can be used for the seismic design, maintenance and rehabilitation of long-span semi-supported steel truss arch bridge.
semi-supported steel truss arch bridge procedure dynamic time-history analysis uniform ezcitation multiple-support ezcitations
Dai-Hai Chen Wen-Hua Guo Zheng Li
School of Civil Engineering and Architecture, Centre South University, Changsha 410075, P.R. China
国际会议
广州
英文
1414-1419
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）