非规则连续刚构桥地震易损性分析
发布时间：2019-01-17 21:28
【摘要】：为探讨非规则桥梁的抗震性能,建立了典型非规则公路桥梁的地震易损性理论模型.考虑桥梁结构参数和地震动的不确定性,抽样生成桥梁地震易损性分析模型样本库.用Open Sees软件对模型样本库进行非线性动力时程分析,以获得结构动力响应.在研究桥墩反弯点时程曲线和桥墩曲率包络线分布特征的基础上确定桥梁构件的损伤指标.采用概率地震需求分析方法获得桥梁各构件易损性曲线,并基于一阶可靠度理论获得桥梁系统的易损性曲线.结果表明:在地震作用下,非规则桥梁支座最容易损伤破坏,桥梁系统的易损性明显高于桥梁构件的易损性;易损性曲线可用于评估非规则桥梁的抗震性能,为震后桥梁损伤识别提供依据.
[Abstract]:In order to study the seismic behavior of irregular bridges, a theoretical model of seismic vulnerability of typical irregular highway bridges is established. Considering the uncertainty of bridge structure parameters and ground motion, a sample library of bridge seismic vulnerability analysis model is generated by sampling. The nonlinear dynamic time history analysis of the model sample library is carried out by using Open Sees software to obtain the dynamic response of the structure. The damage index of bridge members is determined on the basis of studying the time-history curve of pier reverse bending point and the distribution of curvature envelope of pier. The vulnerability curves of bridge components are obtained by using probabilistic seismic requirement analysis method, and the vulnerability curves of bridge systems are obtained based on the first-order reliability theory. The results show that the irregular bridge supports are most vulnerable to damage under earthquake, and the vulnerability of bridge system is obviously higher than that of bridge components. The vulnerability curve can be used to evaluate the seismic performance of irregular bridges and provide the basis for damage identification of post-earthquake bridges.
【作者单位】： 西南交通大学土木工程学院;
【基金】：国家973计划资助项目(2013CB036300-2) 国家自然科学基金资助项目(51078316) 四川省科技计划资助项目(2011JY0032) 铁路科技研究开发计划项目(2011G026-E,2012G013-C)
【分类号】：U448.23;U442.55
[Abstract]:In order to study the seismic behavior of irregular bridges, a theoretical model of seismic vulnerability of typical irregular highway bridges is established. Considering the uncertainty of bridge structure parameters and ground motion, a sample library of bridge seismic vulnerability analysis model is generated by sampling. The nonlinear dynamic time history analysis of the model sample library is carried out by using Open Sees software to obtain the dynamic response of the structure. The damage index of bridge members is determined on the basis of studying the time-history curve of pier reverse bending point and the distribution of curvature envelope of pier. The vulnerability curves of bridge components are obtained by using probabilistic seismic requirement analysis method, and the vulnerability curves of bridge systems are obtained based on the first-order reliability theory. The results show that the irregular bridge supports are most vulnerable to damage under earthquake, and the vulnerability of bridge system is obviously higher than that of bridge components. The vulnerability curve can be used to evaluate the seismic performance of irregular bridges and provide the basis for damage identification of post-earthquake bridges.
【作者单位】： 西南交通大学土木工程学院;
【基金】：国家973计划资助项目(2013CB036300-2) 国家自然科学基金资助项目(51078316) 四川省科技计划资助项目(2011JY0032) 铁路科技研究开发计划项目(2011G026-E,2012G013-C)
【分类号】：U448.23;U442.55
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