考虑行波效应的双薄壁连续刚构桥地震响应分析  

Seismic Response of Double Thin–Wall Continuous Rigid Frame Bridge Considering Traveling Wave Effect

作　　者：马华军[1,2] 鲁锦华 郝勇[1] 王宇轩 Ma Huajun;Lu Jinhua;Hao Yong;Wang Yuxuan(Road and Bridge Engineering Disaster Prevention Technology Local Joint National Engineering Laboratory,Lanzhou 730070,China;Key laboratory of Road Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州730070

出　　处：《工程研究（跨学科视野中的工程）》2018年第2期192-198,共7页JOURNAL OF ENGINEERING STUDIES

基　　金：国家自然科学基金(51268027)

摘　　要：为了明确双薄壁连续刚构桥在地震作用下的抗震性能,以某跨度布置为(68+116+68)m的双薄壁连续刚构桥为工程实例,应用MIDAS软件建立了全桥空间有限元模型。基于非一致地震动输入方法,分析了行波效应作用下双薄壁桥墩不同肢间距对连续刚构地震响应的影响。结果表明:对于中矮墩双薄壁连续刚构桥,随着肢间距的增大,结构自振周期减小,体系刚度增大。随着视波速的增加,结构地震响应逐渐接近一致激励下的结果,可知行波效应对不同肢间距双薄壁刚构桥的影响程度相近。相对于一致激励结果,行波效应对下部结构的地震响应有减小作用,而上部结构受行波影响程度较大,行波效应后跨中轴力相对于一致激励下的结果增加3倍左右,因此在该类桥梁的设计中应重点考虑行波效应对上部结构的影响。A double thin-wall continuous rigid frame bridge with a span of(68+116+68)m is selected as the engineering background in this study.A full-bridge finite element model is established with the assistance of MIDAS software to analyze the seismic performance of double thin–wall continuous rigid frame bridge.The multi-support seismic excitation is applied to consider the traveling wave effect.The results show that the self-vibration period of the double-thin continuous rigid frame bridge decreases with the increase of the double-limb spacing.The seismic responses obtained by considering travelling effect tend to those obtained without considering travelling effect when the apparent velocity increases.The seismic responses of the substructure are reduced by considering the traveling wave effect,while the traveling wave effect has significant effect on the superstructure.The axial force of the girder with considering the traveling wave effect is 3 times greater than that with uniform excitation.Therefore,the preliminary design or seismic analysis of the double thin-walled structure should focus on the influence of the traveling wave effect on the superstructure.

关 键 词：行波效应 双薄壁桥墩 肢间距 地震响应 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]