考虑各施工阶段受力影响的连续刚构桥梁地震损伤分析  

Seismic damage analysis of continuous rigid frame bridge considering the influence of construction stages

作　　者：刘仕远 王慧东 Liu Shi-yuan;Wang Hui-dong(Institute of Standards and Metrology,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;China Railway Test and Certification Center Co.Ltd,Beijing 100081,China;College of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]中国铁道科学研究院集团有限公司标准计量研究所,北京100081 [2]中铁检验认证中心有限公司,北京100081 [3]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《工程抗震与加固改造》2024年第5期159-168,178,共11页Earthquake Resistant Engineering and Retrofitting

摘　　要：为研究处于各施工阶段的连续刚构桥梁受力情况的不同在抗震易损性方面的影响,通过研究一座大跨高墩连续刚构桥进一步对该类桥的地震损伤性能进行分析。以Midas/Civil软件建立各施工阶段模型,提取施工阶段的受力情况,并将各阶段受力情况输入Abaqus软件建立的结构模型中,并以等效荷载法提出的适用于连续刚构桥在施工阶段下主梁和主墩的内力等效荷载计算公式验证内力的吻合情况。基于规范反应谱生成10组近断层脉冲型地震动记录,分别输入两组模型,以增量动力分析法对是否考虑施工阶段受力情况的两组模型进行时程分析。曲率延性系数为损伤指标划分损伤状态,基于理论易损性分析方法,加速度峰值作为地震动强度指标,取得主墩墩底、墩顶和墩梁固结处地震易损性曲线。研究结果显示:内力等效荷载计算公式模拟的等效内力与各施工阶段的内力吻合较准确;相同地震动强度不同施工阶段下,墩底、墩顶和墩梁固结处各损伤状态的损伤超越概率均随主梁悬臂长度的增加而增加;不考虑施工阶段桥梁的受力将会低估墩底、墩顶的损伤概率,同时高估墩梁固结处的损伤概率。损伤概率低估量在墩底沿纵桥向最大,且该低估量的大小也与主梁悬臂长度有直接关系,随悬臂长度的增加而增大。In order to study the influence of different stress conditions in different construction stages of continuous rigid frame bridges on seismic vulnerability,the seismic damage performance of a long-span high-pier continuous rigid frame bridge is further analyzed.The models of each construction stage were established by software Midas/Civil,the obtained stress conditions of the construction stage were extracted,and inputted into the structural model established by software Abaqus.The internal forces obtained by the numerical simulation are verified to match those of the main beam and the main pier calculated by the equivalent load formula.Based on the standard response spectrum,10 groups of near-fault pulse ground motion records were generated,and two groups of models were input respectively.The incremental dynamic analysis method was used to analyze the time history of the two groups of models considering the force situation in the construction stage.The curvature ductility coefficient is the damage index to divide the damage state.Based on the theoretical vulnerability analysis method,the peak acceleration is used as the ground motion intensity index to obtain the seismic vulnerability curves of the main pier bottom,pier top and pier beam consolidation.The results show that the equivalent internal forces formulated by equivalent load method in each construction stage is in good agreement with those simulated by finite element method.Under the same ground motion intensity and different construction stages,the damage exceedance probabilities of the pier bottom,pier top and pier beam consolidation in each damage state increase with the increase of the cantilever length of the main beam;the damage probability of pier bottom and pier top will be underestimated without considering the force of bridge in construction stage,and the damage probability of pier beam consolidation will be overestimated.The underestimation of damage probability is the largest at the bottom of the pier along the longitudinal direction of the br

关 键 词：连续刚构桥 施工阶段 受力影响 等效荷载法 增量动力分析 地震损伤分析 易损性曲线 

分 类 号：U121[交通运输工程]