基于动水及桩-土-结构相互作用的斜拉桥地震响应分析  

Seismic response analysis hydrodynamic and pile-soil-structure interaction for river-spanning cable-stayed bridge

作　　者：高大峰[1] 路军[1] 谢祥兵 董旭[1] 陈凯旋[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《世界地震工程》2015年第4期15-22,共8页World Earthquake Engineering

基　　金：国家自然基金项目(51408453);陕西省重点学科建设专项资金资助项目(E01004)

摘　　要：为了得到更为符合实际情况的跨江大桥动力稳定性的地震反应分析,在桥梁抗震研究中必须综合考虑动水及桩–土–结构的相互作用。基于此,结合某斜拉桥,采用基于Morison方程的动水力简便计算方法来模拟水对桥梁下部结构的动水压力,通过大型有限元程序Midas/Civil分别建立了没有考虑动水及桩土效应和考虑动水及桩土效应2种情形下的计算模型,通过输入El Centro波分析了动水及桩土效应对斜拉桥结构动力特性和地震反应的影响。分析表明:动水及桩土效应对斜拉桥动力特性和地震反应的影响较大,因此在对跨江斜拉桥结构进行抗震分析时,应考虑动水及桩土效应对其动力反应的影响。In order to achieve the better response analysis of fiver-spanning bridge, the dynamic water and pile-soil- structure interaction are considered. Based on a cable-stayed bridge, use the dynamic hydraulic simple calculation method based on the Morison equation to simulate the dynamic water pressure on the lower part of the bridge struc- ture, through the finite element program Midas/Civil respectively established without the dynamic water and pile- soil-structure interaction and considering the dynamic water and pile-soil-structure interaction the two calculation model of the bridge, through input E1 centro seismic wave to analysis the dynamic characteristics and seismic re- sponse of cable-stayed bridge under the dynamic water and pile-soil-structure interaction. Analysis shows that the dynamic water and the effect of piles and soil influence on the dynamic characteristics and seismic response of ca- ble-stayed bridge is bigger, so when analysis the seismic of cable-stayed bridge across the river, the effect on its dynamic response by the dynamic water and pile-soil-structure interaction should be considered.

关 键 词：斜拉桥 动水及桩–土–结构的相互作用 抗震分析 动水压力 

分 类 号：TU43[建筑科学—岩土工程]