下承式钢管混凝土系杆拱桥隔震研究  

Research on Isolation of Concrete-filled Steel Tube Tied Arch Bridge

作　　者：高忠虎[1] 狄生奎[2] 吴忠铁[1] 吴云[1] Gao Zhonghu;Di Shengkui;Wu Zhongtie;Wu Yun(School of Civil Engineering Northwest Minzu University,Lanzhou 730030,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology,730050,China)

机构地区：[1]西北民族大学土木工程学院,兰州730030 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,730050

出　　处：《特种结构》2020年第4期80-85,共6页Special Structures

基　　金：国家自然科学基金(51868067);中央高校基本科研业务费专项资金(31920170068);甘肃省高等学校创新基金项目(2020B-067);甘肃省建设厅科技攻关项目(JK2019-10)。

摘　　要：以某下承式钢管混凝土系杆拱桥为背景,利用MIDAS Civil软件建立了非隔震模型和设置铅芯橡胶支座的隔震模型,并分别进行了动力特性分析与对比。对两种模型分别在横向、纵向和竖向输入地震波,对比分析了不同方向地震作用下拱肋最大位移,拱肋和桥墩最大内力,得出不同方向地震作用下隔震结构与地震作用方向相同的拱肋最大位移出现增大现象;在横向地震和纵向地震作用下隔震结构拱肋和桥墩最大内力均出现不同程度降低现象;竖向地震作用下隔震结构拱肋和桥墩最大轴力出现了增大现象。地震作用方向不同,结构响应不同,结构地震响应分析时应重视地震作用的方向性。Taking a concrete-filled steel tube tied arch bridge as background,the non isolation model and the isolation model with lead rubber bearing were established by Midas civil software separately,and their dynamic characteristics were analyzed and compared.The maximum displacement of the arch rib and the maximum internal force of the arch rib and the pier were compared and analyzed under different directions of earthquake.It was found that the maximum displacement of the arch rib increases when the isolation structure and the earthquake action direction were the same in different directions;the maximum internal force of the arch rib and the pier of the isolation structure is decreased in different degrees under the lateral and longitudinal earthquake;the maximum internal force of the arch rib and the pier of the isolation structure is reduced under the vertical earthquake;the maximum axial force of the arch rib and pier of the lower isolation structure increases.The direction of seismic action should be paid attention to in the analysis of structural seismic response.

关 键 词：下承式钢管混凝土拱桥 拱桥隔震 铅芯橡胶隔震支座 动力特性 地震响应 

分 类 号：U448.225[建筑科学—桥梁与隧道工程]