软土场地上双座串联大跨度斜拉桥地震响应及碰撞分析  

Seismic Response and Collision Analysis of Two Series-connected Long-span Cable-stayed Bridges at Soft Soil Site

作　　者：王德光 王恒 沈文爱 何友娣[3] 张强[3] WANG De-guang;WANG Heng;SHEN Wen-ai;HE You-di;ZHANG Qiang(Hangzhou Jiangdong Construction Engineering Project Management Co Ltd,Hangzhou 310004,China;School of Civil Engineering&Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China;China Railway Major Bridge Reconnaissance&Design Institute Co Ltd,Wuhan 430050,China)

机构地区：[1]杭州江东建设工程项目管理有限公司,浙江杭州310004 [2]华中科技大学土木工程与力学学院,湖北武汉430074 [3]中铁大桥勘测设计院集团有限公司,湖北武汉430050

出　　处：《土木工程与管理学报》2020年第3期52-58,共7页Journal of Civil Engineering and Management

基　　金：中铁大桥勘测设计院集团有限公司科技项目;国家自然科学基金(51838006)。

摘　　要：本文分析了软土场地上双座串联大跨度斜拉桥--洪鹤大桥的地震响应及相邻斜拉桥的碰撞问题。首先,建立其空间有限元模型进行了动力特性分析;随后,考虑桥梁特点及场地效应,选取合适的地震波,采取纵桥向+0.3横桥向+0.3竖桥向的激励组合方式输入,对桥梁关键部位动力响应进行了非线性时程分析,并将结果与反应谱法进行对比验证;最后,对两座斜拉桥交接墩处主梁的碰撞问题展开了研究。结果表明:三向地震作用下,结构主梁及主塔均以纵桥向位移为主,且主梁横桥向位移不可忽略;结构在主塔处的剪力、弯矩远大于桥墩处,各方向内力最大值集中在4号塔及8号塔塔底右边,这在抗震设计中应引起重视;在E2地震作用下交接墩处两主梁不会发生碰撞,但建议在塔梁处布置纵向液体粘滞阻尼器以提高其减震性能。This paper analyzes the seismic response of Honghe Bridge,which consists of two series-connected long-span cable-stayed bridges,and the collision of adjacent cable-stayed bridges.Firstly,the spatial finite element model is established to analyze the dynamic characteristics of the bridge.Secondly,considering the characteristics of the bridge and the site effect,the appropriate seismic wave is selected,and the longitudinal+0.3 transverse+0.3 vertical excitation combination mode is adopted to input.The nonlinear time-history analysis of the dynamic response of the key parts of the bridge is carried out,and the results are compared with the response spectrum method.Finally,the collision of the main girder at the joint pier of two cable-stayed bridges is studied.The results show that under the action of three-way earthquake,the displacement of the main beam and the main tower of the structure are mainly longitudinal,and the transverse displacement of the main beam cannot be ignored;the shear force and bending moment of the structure at the main tower are much greater than those of the piers,and the maximum internal force in each direction is concentrated on the right side of the bottom of tower 4 and tower 8,which should be paid attention to in the seismic design.The two main girders at the transfer pier under the E2 earthquake action will not collide.It is suggested that the longitudinal liquid viscous damper should be placed at the tower girder to improve its damping performance.

关 键 词：斜拉桥 串联 地震响应 交接墩 碰撞 减震措施 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]