【摘要】 大跨斜拉桥是交通运输的枢纽工程,一旦在地震中遭到破坏,将会造成巨大的直接和间接经济损失。由于大跨斜拉桥的跨度大,在地震中地震波到达不同桥墩的时间存在差异,这会对大跨斜拉桥的地震反应产生很大影响。因此,对大跨斜拉桥在多点输入下的反应开展研究,对进行正确有效的抗震设计,确保其抗震安全性具有非常重要的意义。本文分析了多点激励下大跨度斜拉桥的地震反应,并与一致激励下大跨度斜拉桥的地震反应进行了对比,研究了多点激励对大跨度斜拉桥地震反应的影响。更多还原

【Abstract】 Long span cable-stayed bridges generally are the key structures of transportation system.Great direct and indirect economic loss will be caused,if these bridges are damaged in an earthquake.Becauses of the long span,there exists the difference of seismic wave arrival time at different bridge piers during an earthquake,which will have a significant influence on the seismic responses of long-span cable-stayed bridges.So,to study the seismic responses of long-span cable-stayed bridges with multi-support excitation will be very important to seismic design and seismic safety.In this paper the comparison study is carried out on the seismic responses between uniform excitation and multi-support excitation,and the influence of multi-support excitation on the bridge is studied emphatically.更多还原