中承式钢管混凝土拱桥地震易损性分析  

Seismic Fragility Analysis of Half-through Concrete Filled Steel Tubular Arch Bridge

作　　者：卓卫东[1] 颜全哲[1,2] 吴梅容 谷音 ZHUO Weidong;YAN Quanzhe;WU Meirong;GU Yin(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Highway Administrative Bureau,Fuzhou 350004,China;Department of Highway Engineering,Fujian Chuanzheng Communications College,Fuzhou 350007,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建省公路管理局,福建福州350004 [3]福建船政交通职业学院道路工程系,福建福州350007

出　　处：《铁道学报》2019年第5期126-132,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(51578157)

摘　　要：为从概率角度定量地描述中承式钢管混凝土拱桥的抗震性能,探讨采用理论分析法建立其地震易损性曲线。通过调查统计国内已建成的百余座中承式钢管混凝土拱桥的基本资料,总结其设计参数常用的取值范围及构造特点。以三跨无推力中承式钢管混凝土系杆拱桥为研究对象,建立其典型桥梁样本;通过线弹性静力分析和时程分析,确定典型桥梁样本在地震组合下的易损部位,进而定义各构件的性能水平;采用增量动力分析方法,建立典型桥梁样本的理论地震易损性曲线。结果表明:对三跨无推力体系,交接墩及其上设置的盆式支座是主要的易损构件,拱肋、吊杆和系杆以及基础一般不会因地震作用而破坏;与Ⅰ类场地条件相比,Ⅱ类场地条件下结构的损伤概率相对较高,而且地震动强度越高,场地条件的影响也越大。In order to describe the seismic performance of half-through concrete filled steel tubular (CFST) arch bridge from the perspective of probability,the theoretical analysis method was used to establish the seismic fragility curves of CFST arch bridges. Based on the investigation of the basic data of more than 100 half-through CFST arch bridges built in China,common ranges of basic design parameters and general construction of the arch bridges were concluded. Based on the case study of a three-span half-through CFST tied arch bridge without thrust,a typical bridge sample was built. The vulnerable components of the typical bridge sample under seismic combination were determined by linear elastic static analysis and time-history analysis,while the performance levels of each component were defined. The theoretical seismic fragility curves of the typical bridge sample were established by incremental dynamic analysis (IDA) method. The results show that for the three-span non-thrust system,the main vulnerable components are the connecting piers and the pot bearings installed on the connecting piers,and the arch ribs,suspenders,tied rods and foundations are generally not damaged under seismic action. Compared with Type I site condition,the damage probability of the structure under Type II site condition is relatively high. The effect of site conditions is greater with higher intensity of seismic ground motion.

关 键 词：钢管混凝土拱桥 理论分析法 增量动力分析 地震易损性曲线 无推力拱桥 

分 类 号：U24[交通运输工程—道路与铁道工程]