地震工程学报2024，Vol.46Issue(1)：26-38,13.DOI:10.20000/j.1000-0844.20211230002
不同地震激励方向下隔震曲线梁桥易损性分析
Fragility analysis of isolated curved girder bridges under different seismic excitation directions
摘要
Abstract
To further evaluate the seismic performance of isolated curved girder bridges under seismic excitation,the influence of seismic excitation direction on their fragility was studied.A finite element model of an isolated curved girder bridge with laminated rubber bearings was estab-lished by APDL.Near-fault ground motions in the same seismic event were selected from PEER,and horizontal bidirectional ground motions were input according to the proportion specified in the code for nonlinear dynamic time-history analysis.The seismic fragility curves of the components were calculated by combining the seismic response and damage index.Considering the change in seismic excitation direction,seismic fragility surfaces of the components(pier and bearing)and bridge system were obtained using MATLAB programming and the influence of seismic excitation direction on the fragility of the isolated curved girder bridge was analyzed and discussed.The re-sults show that under different limit states,the tangential damage probability of each pier is obvi-ously greater than that in the radial direction.The tangential fragility of each bearing is slightly greater than the radial fragility,with little difference.The tangential fragility of bridge members(pier and bearing)strongly depends on the seismic excitation direction,whereas the dependence of radial fragility is weaker;with an increasing damage level,the fragility of members becomes more sensitive to the seismic excitation direction.The fragility of the bridge system,which is in-sensitive to changes in the seismic excitation direction,is closer to that of the most vulnerable component because of the high correlation between the responses of the components.When evalu-ating the seismic performance of the isolated curved girder bridges,the influence of the seismic excitation direction on their seismic fragility should be considered to make the fragility analysis results more reasonable and reflect their actual damage state more accurately.关键词
隔震曲线梁桥/抗震性能/地震激励方向/易损性曲面Key words
isolated curved girder bridge/seismic performance/seismic excitation direction/fragility surface分类
建筑与水利引用本文复制引用
李喜梅,蒲奎,杨国俊,母渤海..不同地震激励方向下隔震曲线梁桥易损性分析[J].地震工程学报,2024,46(1):26-38,13.基金项目
中国博士后科学基金面上项目(2019M653897XB) （2019M653897XB）
国家自然科学基金(青年基金)(51808274) （青年基金）
