蝶形斜拉桥抗震性能分析  

Seismic Performance Analysis of a Butterfly-shaped Cable-stayed Bridge

作　　者：周彦 陈爱军[1] 贺国京[1] ZHOU Yan;CHEN Aijun;HE Guojing(School of CivilEngineering,Central South University of Forestry and Technology,Changsha,Hunan 410001,China)

机构地区：[1]中南林业科技大学土木学院,湖南长沙410001

出　　处：《公路工程》2020年第4期24-29,52,共7页Highway Engineering

基　　金：国家自然科学基金项目(51178473)。

摘　　要：为研究一座钢-混组合结构蝶形斜拉桥的抗震性能,以武水大桥为工程背景,通过Midas/civil 2018建立了主桥上部结构的三维有限元分析模型。首先,选用子空间迭代法和多重李兹向量法对主桥上部结构进行模态分析。再运用地震反应谱分析法和动态时程分析法,对主桥上部结构在各向地震荷载作用下所产生的地震响应进行对比分析。研究结果表明:该蝶形斜拉桥分别在竖向以及纵向地震激励下所产生的地震效应较弱,而在横向地震荷载作用下的地震效应则较为明显,钢拱塔顶部的最大横向位移达66.581 mm,但完全满足设计要求。由此可知,主塔采用钢-混组合结构的蝶形斜拉桥具有很好的抗震性能。In order to study the seismic performance of a butterfly-shaped cable-stayed bridge with steel-concrete composite structure based on the WuShui bridge, a three-dimensional finite element analytic model was established by using Midas/Civil 2018. First of all, the modal analysis of the bridge was carried out by the subspace iteration method and the multiple Ritz vector method within Midas.After that, the seismic response analysis of Response spectrum as well as Time-History analysis were comparatively adopted in order to analyze the seismic response of the bridge under the action of earthquake in all directions.The research results indicated that the butterfly-shaped cable-stayed bridge under the horizontal earthquake action and vertical earthquake action has a weak seismic effect,while the seismic effect is more obvious under the action of lateral earthquake,and the maximum lateral displacement on top of steel arch tower is 66.581 mm,but it still meets the design requirement.Hence,the butterfly-shaped cable-stayed bridge with steel-concrete composite structure has good seismic performance.

关 键 词：抗震性能 蝶形斜拉桥 钢-混组合结构 钢拱塔 横向地震作用 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]