公路规则梁桥地震易损性模型及简化计算方法  

Seismic Vulnerabilitu Models and Simplified Calculation Method for Regular Highway Girder Bridges

作　　者：陈力波[1] 黄才贵 黄勇冰 栗怀广[2] 

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2018年第1期146-155,共10页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51308125);中国博士后科学基金资助项目(2014M561855)

摘　　要：为了快速评估桥梁结构达到特定损伤状态的概率,基于非线性动力时程分析结果,建立了公路规则梁桥地震易损性模型并提出了简化计算方法.依据不同上部结构支承形式、墩柱形式和设计规范,将公路规则梁桥细化为8种桥型,针对每种桥型分别建构了80个基准桥梁样本作为各类桥型代表.选择墩柱和支座作为桥梁的易损构件,确定桥梁墩柱和支座在不同损伤状态下对应的参数能力范围.用Open Sees建立桥梁样本的有限元模型,采用增量动力分析方法,分析得到各类桥梁的全桥系统地震易损性模型.以计算得到的易损性模型参数为样本,提出适用于我国公路规则梁桥的中位值简化计算公式,同时给出对数标准差的建议值.研究结果表明:对于规则梁桥中位值,双柱式梁桥相对单柱式梁桥增大17%、新规范相对旧规范增长7%、连续梁桥相对简支梁桥增大8%;简化公式计算结果与分类易损性模型吻合较好,均方误差和均方根误差分别为5.26%和5.95%,最大绝对误差10.58%.In order to swiftly assess the probability of a bridge structure reaching a specific damage state,seismic vulnerability models for regular highway girder bridges and a simplified method for their calculation are established,based on the results of a nonlinear dynamic time history analysis.Depending on the type of bridge,column,and design specification,regular highway girder bridges are divided into eight categories,with 80 benchmark bridge samples constructed for each category.Columns and bearings are considered vulnerable components,in which the component limits for different bridge damage states are determined.A finite element model of bridge samples is established using the Open Sees database.By employing an incremental dynamic analysis approach,seismic vulnerability models for regular highway girder bridges are obtained.Based on the analysis results,a new simplified formula for the calculation of median values was fitted and proposed for application to the existing regular highway girder bridge situation in China,along with the recommended values of logarithmic standard deviation.The results indicate that the median value for a double-pier bridgeincreased by 17% compared to a single-pier type and that of a continuous type increased by 8% compared to a simply supported bridge.Also,the efficiency of the latest design code increase by 7% compared to its former version.The results computed using the proposed simplified formula showed a good correlation with the categorical vulnerability models,with a mean square error and root mean square error of 5.26% and 5.95%,respectively,and a maximum absolute error of 10.58%.

关 键 词：地震易损性 公路规则梁桥 增量动力分析 模型参数 简化计算方法 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]