摘要
为研究不同激励方向下铁路上承式钢桁拱桥地震响应特征,以某提篮式钢拱桥为分析对象,采用Midas/civil软件建立全桥动力计算模型,根据反应谱法原理获得了不同激励方向下主要振型的节点惯性力,进而分离出各主要振型对拱圈地震反应的贡献.分析结果表明:引入的振型反应贡献率可以从微观定量评价主要振型对结构各杆件地震反应的贡献大小;总体上看,相对于其它主要振型,控制振型对结构地震反应的贡献率占有主导地位;相对于控制振型,其它主要振型引起的地震反应在某些区域仍然很大,不可忽略.
To study the seismic response characteristics of railway deck-type steel truss arch bridges under different excitation directions,a handle-basket steel arch bridge is cited as the analysis object.A dynamic analysis model of the whole bridge is built by using the software Midas/civil,the node inertia force of the main mode shapes under different excitation directions is obtained based on the principle of mode analysis spectrum method,and the seismic response caused by main mode shapes is separated.The results show that the contribution rate of the main modes to the seismic response of each member of the structure can be quantitatively evaluated on a microscopic level.On the whole,the contribution rate of control mode shapes to structural seismic response plays a dominant role compared with other main mode shapes.The seismic response caused by other main mode shapes is still large in some areas compared with other control mode shapes and cannot be ignored.
作者
刘海波
肖春文
张永亮
冯鹏飞
LIU Hai-bo;XIAO Chun-wen;ZHANG Yong-liang;FENG Peng-fei(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway Seventh Group CO.,LTD.,Zhengzhou 450016,China;Qinghai ProvincialHighway Scientific Research and Design Institute,Xining 810001,China)
出处
《兰州交通大学学报》
CAS
2020年第4期34-38,46,共6页
Journal of Lanzhou Jiaotong University
基金
国家自然科学基金(51768037)
甘肃省科技计划项目(17JR5RA103)。
关键词
上承式钢桁拱桥
振型反应贡献率
反应谱法
地震响应
a deck-type steel truss arch bridge
response contribution rate of mode shape
response spectrum method
seismic response
