近场地震作用下组合横梁桥塔的悬索桥地震响应研究  

Seismic response of a suspension bridge tower installed with composite beam subjected to near-field earthquake

作　　者：段佳宏 曹发辉 林帆 冉志红 刘振宇 张静 杨思昭 DUAN Jiahong;CAO Fahui;LIN Fan;RAN Zhihong;LIU Zhenyu;ZHANG Jing;YANG Sizhao(School of Architecture and Planning,Yunnan University,Kunming 650500,China;Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu 610041,China)

机构地区：[1]云南大学建筑与规划学院,昆明650500 [2]四川省公路规划勘察设计研究院有限公司,成都610041

出　　处：《振动与冲击》2020年第9期221-228,253,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51968074);云南省交通厅科研项目(云交科2016(A)02)。

摘　　要：在近场地震作用下,为减小桥塔塔身弯矩,悬索桥桥塔创新性地设置波形钢腹板横梁。以大渡河大桥为研究对象,基于横梁拟静力试验数据,建立结构动力数值计算模型并输入不同类型的近场地震动计算结构的地震响应,探究采用波形钢腹板横梁悬索桥的优势和近场效应对结构响应的影响规律。研究表明:采用波形钢腹板横梁的桥塔有自重轻、刚度小的优势,更符合强柱弱梁和强剪弱弯;在高烈度的近场作用下,以波形钢腹板横梁的延性作为抗震策略是合理的。脉冲效应对本桥响应影响较大,因此建议此类型桥梁应重视近场脉冲效应;而上盘效应对本桥的响应小于无近场效应的地震动,故处于上盘的桥梁是更安全的;在横向地震激励下,近场脉冲效应对主塔的位移和弯矩影响较大。In order to reduce the moment on the tower section under near-field earthquake,a suspension bridge tower was innovatively installed with the corrugated steel web beam.Taking the Dadu river bridge as an example,and based on the pseudo-static test data of the beam,a numerical structural dynamics model was established.The structural seismic responses were calculated under different types of near-field ground motions to investigate the seismic performance of the suspension bridge and its near-field effect.The results show that the bridge tower with corrugated steel web beam has the advantages of light weight and low rigidity,and more conforms to the design idea of strong column weak beam and strong shear weak bend.Under high intensity near-field earthquake,the ductility of corrugated steel web beam is reasonable to the seismic strategy.The pulse effect has a greater influence on the response.Therefore,it suggests that for this type of bridges,the near-field pulse effect should be paid more attention.The response to the hanging wall effect is less than that to a ground motion without near-field effect,so the bridge on the hanging wall is safer.Under transverse seismic excitation,the near-field pulse effect has a greater influence on the displacement and moment of the bridge tower.

关 键 词：脉冲效应 上盘效应 地震响应 波形钢腹板横梁 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]