下承式钢管混凝土拱桥地震易损性分析  

Seismic vulnerability analysis of through concrete-filled steel tube arch bridge

作　　者：黄飞鸿 何沛祥[1] 吴腾飞 HUANG Feihong;HE Peixiang;WU Tengfei(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China;China Railway 24th Bureau Group Anhui Engineering Corp., Ltd., Hefei 230011, China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]中铁二十四局集团安徽工程有限公司,安徽合肥230011

出　　处：《合肥工业大学学报（自然科学版）》2022年第6期801-807,共7页Journal of Hefei University of Technology：Natural Science

基　　金：合肥工业大学产学研校企合作资助项目(W2020JSFW0263)。

摘　　要：钢管混凝土拱桥是一种广泛运用的桥梁结构形式,为研究其在地震作用下的易损性,文章针对下承式钢管混凝土拱桥,以其支座、拱肋和系梁3种构件为研究对象,定义了四级损伤状态。基于增量动力分析(incremental dynamic analysis,IDA)方法对符合工程地质条件的20条地震波进行调幅,对桥梁模型进行地震分析,统计落入每一级损伤状态的频数,计算对应频率。采用对数正态分布的分布函数对频率点进行拟合得到3种构件的易损性曲线,同时考虑各个构件的重要性,引入权重得到桥梁系统的易损性曲线。结果表明,对数正态分布的分布函数对各级损伤状态的损伤概率拟合较好,且桥梁系统的易损性高于主要构件的易损性,考虑权重计算桥梁系统的易损性具有合理性。Concrete-filled steel tube arch bridge is a sort of bridge structure broadly used.In order to study its vulnerability to earthquakes,this paper focuses on the through concrete-filled steel tube arch bridge,taking its support,arch rib and tie beam as the research object,and defines the four-stage damage state.The incremental dynamic analysis(IDA)method is used to modulate the amplitude of 20 seismic waves in accordance with engineering geological conditions,and the seismic analysis is carried out on the bridge model,the frequency of falling into the damage state of each stage is counted and the corresponding frequency is calculated.The distribution function of logarithmic normal distribution is used to fit the frequency points to get the vulnerability curves of the three components,at the same time,considering the importance of each component,the vulnerability curve of the bridge system is obtained by introducing the weight.The results show that the distribution function of logarithmic normal distribution can fit the damage probability of all levels of damage states well,and the vulnerability of the bridge system is higher than that of the main components,it is reasonable to consider the weight to calculate the vulnerability of bridge system.

关 键 词：下承式钢管混凝土拱桥 增量动力分析(IDA) 地震易损性 系统易损性 权重 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]