防灾减灾工程学报2017，Vol.37Issue(1)：39-48,10.DOI:10.13409/j.cnki.jdpme.2017.01.006
基于IDA钢管混凝土桁架连续曲线桥抗震易损性分析
Evaluation of Seismic Vulnerability of CFST and Continuous Curved Bridge Using IDA
摘要
Abstract
Taking a CFST and spacial composite trussed continuous bridge with pier height of 50m as the engineering background,the elastic-plastic three-dimensional FEA model was proposed by using OpenSees,the responses were analyzed based on IDA method by using 10 earthquake ground motion records from PEER seismic database.Curvatures of the most unfavorable section corresponding to the material damage were chosen as damage indices,and the regression analysis of the log function of capacity-demand ratio was performed.Then the expected damage probability was computed,and the vulerability curves of column and abutment were presented.We formed the system vulerability curve of bridge on the basis of the joint probability method.Several models were established for comparison to analyze the influence of pier span ratio and curvature radius on the vulnerability of the bridge.It is observed that when the difference between the height of the CFST lattice piers is not significant,the motion response of the first CFST lattice pier appears to be larger.A large number of rubber bearings between the pier and beam form the elastic connection and the hinged damping,can effectively reduce the bridge complete failure probability.Higher pier span ratio could lead to the rise of complete damage probability of bridge system.With the increasement of the bridge curvature radius,the damage probability increases;the arch structure of curved bridge is also beneficial for resisting the earthquake along the bridge.关键词
易损性/增量动力分析/钢管混凝土格构墩/钢管混凝土空间组合桁架/对比模型Key words
ulnerability/IDA/CFST lattice pier/CFST spacial composite truss/contrast models分类
交通工程引用本文复制引用
王海良,张铎,刘中宪..基于IDA钢管混凝土桁架连续曲线桥抗震易损性分析[J].防灾减灾工程学报,2017,37(1):39-48,10.基金项目
国家自然科学基金项目(51278327)资助 （51278327）
