非规则桥梁近、远场地震易损性对比分析

发布时间：2019-07-04 14:34

【摘要】：为研究高墩大跨非规则桥梁的近、远场地震易损性,建立了典型非规则公路连续刚构桥的理论地震易损性模型.考虑近、远场地震动和桥梁结构参数的不确定性,抽样并生成桥梁近、远场地震易损性分析的模型样本库,利用Open Sees软件对模型样本库进行非线性动力时程分析,获得结构动力响应.而后在确定桥梁各易损构件损伤指标的基础上,采用概率地震需求分析方法建立了桥梁各构件近、远场地震易损性曲线并进行对比分析.分析结果表明:非规则桥梁结构的易损性情况与地震动频谱特性、结构非规则性密切相关,各构件近场地震动损伤概率明显高于远场.将地震动按断层距分组进行桥梁地震易损性分析是必要的.获得的易损性曲线可用于评估非规则桥梁的抗震性能,并为震后桥梁损伤评估提供依据.
[Abstract]:In order to study the near and far field seismic vulnerability of irregular bridges with high piers and long span, the theoretical seismic vulnerability model of typical irregular highway continuous rigid frame bridges is established. Considering the uncertainty of near and far site vibration and bridge structural parameters, the model sample database of bridge near and far field seismic vulnerability analysis is sampled and generated. The nonlinear dynamic time history analysis of the model sample database is carried out by using Open Sees software, and the structural dynamic response is obtained. Then, on the basis of determining the damage index of each vulnerable component of the bridge, the seismic vulnerability curves of each member of the bridge in the near and far field are established by using the probabilistic seismic demand analysis method, and the comparative analysis is carried out. The analysis results show that the vulnerability of irregular bridge structure is closely related to the spectrum characteristics of ground motion and the irregularity of the structure, and the damage probability of near site vibration of each component is obviously higher than that of far field. It is necessary to analyze the seismic vulnerability of bridges by grouping ground motion according to fault distance. The obtained vulnerability curve can be used to evaluate the seismic performance of irregular bridges and provide a basis for post-earthquake bridge damage assessment.
【作者单位】：西南交通大学土木工程学院;
【基金】：国家重点基础研究发展计划(2013CB036300-2) 国家自然科学基金(51078316) 四川省科技计划资助(2011JY003)
【分类号】：U442.55

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