曲率半径对城市曲线桥梁地震反应的影响  

Influence of curvature radius change on seismic response of urban curved bridge

作　　者：陈兴冲[1] 侯文杰[1] 张跃进 张永亮[1] 李晓阳[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]青藏铁路公司,青海西宁810006

出　　处：《世界地震工程》2012年第3期43-48,共6页World Earthquake Engineering

摘　　要：以某城市立交工程匝道桥为工程背景,采用MIDAS软件建立了全桥的有限元分析模型。采用反应谱方法研究了不同的曲率半径及地震激励方向对曲线桥梁地震反应的影响。结果表明:曲率半径对曲线桥梁前3阶自振频率影响比较明显;不同曲率半径及地震激励方向对曲线桥梁各墩地震反应的影响较大;应用0°～180°旋转激励法输入反应谱可以获得各个桥墩的最不利地震反应,且与《公路桥梁抗震设计细则》中规定的输入方法所得结果基本一致。Based on a ramp bridge of interchange engineering in some city, the finite element analysis model of whole bridge was established in use of MIDAS software. Effect of different curvature radius and earthquake excita- tion directions on seismic response of the curved bridge was studied by means of response spectrum methods. The calculation results show that the curvature radius of the curved bridge has a great effect on the first three natural fre- quencies. Different curvature radius of the bridge and earthquake excitation direction have relative great effect on seismic response of each pier. The most unfavorable earthquake response of each pier can be obtained using rotation excitation method by inputting response spectrum from 0~ - 180~. The results are almost as the same as that from input methods specified in Guidelines for Seismic Design of Highway Bridges.

关 键 词：城市桥梁 曲率半径 激励方向 地震反应 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]