钢筋混凝土矮塔斜拉桥地震易损性分析  

Seismic vulnerability analysis of reinforced concrete extradosed cable-stayed bridges

作　　者：王国庆 何沛祥[1] 郑攀 何程瑞伟 WANG Guoqing;HE Peixiang;ZHENG Pan;HE Chengruiwei(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,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

出　　处：《合肥工业大学学报（自然科学版）》2023年第8期1122-1128,共7页Journal of Hefei University of Technology：Natural Science

摘　　要：为研究矮塔斜拉桥地震易损性,文章以一座在建钢筋混凝土矮塔斜拉桥为例,分析其构件与系统易损性;考虑材料参数的变异性,采用神经网络模型和均匀设计法建立支座、过渡墩和主墩的易损性曲线;基于串联系统的失效概率公式,采用Copula函数计算构件之间的联合失效概率,绘制系统易损性曲线,并用一阶界限法验证其可行性。结果表明:支座的抗震性能最差,在地震作用下最容易发生破坏;采用Copula函数计算的系统易损性曲线介于一阶界限法的上界和下界之间,且与一阶界限法的下界更接近。To evaluate the seismic vulnerability of extradosed cable-stayed bridges,a reinforced concrete extradosed cable-stayed bridge is used to study its component and system vulnerability.Considering the variability of material parameters,a neural network model and uniform design method is introduced to establish the vulnerability curves of bearings,transition piers and main piers.Based on the calculation formula of failure probability for series system,the Copula function is introduced to calculate the joint failure probability of components,and the system vulnerability curve is drawn,whose feasibility is verified by the first-order boundary method.The results show that bearings have the worst seismic performance and are most prone to damage under earthquake action;the system vulnerability curve calculated by the Copula function is between the upper and lower bounds of the first-order boundary method and is closer to the lower bound.

关 键 词：矮塔斜拉桥 地震易损性 系统易损性 神经网络 COPULA函数 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.35[交通运输工程—道路与铁道工程]