考虑吊杆断裂过程的下承式钢管混凝土拱桥动力分析  

Dynamic analysis of through concrete filled steel tubular arch bridges considering the dynamic effect of suspenders fracture

作　　者：吴庆雄[1] 罗健平 魏小康 徐召 管锡琨 WU Qingxiong;LUO Jianping;WEI Xiaokang;XU Zhao;GUAN Xikun(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;Shandong Expressway Gaoshang Highway Co.,Ltd.,Jinan,Shandong 251600,China;Shandong Provincial Communications Planning and Design Institute Group Co.,Ltd.,Jinan,Shandong 250031,China;Key Laboratory of High Performance Bridge Structure Transportation Industry,Jinan,Shandong 250031,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]山东高速高商公路有限公司,山东济南251600 [3]山东省交通规划设计院集团有限公司,山东济南250031 [4]高性能桥梁结构交通运输行业重点实验室,山东济南250031

出　　处：《福州大学学报（自然科学版）》2023年第3期409-416,共8页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51678154,52078137)。

摘　　要：收集并分析62座下承式钢管混凝土(CFST)拱桥的主要参数,构建6种不同跨径的下承式CFST标准拱桥.采用MSC.Marc有限元软件模拟缩尺试验模型吊杆断裂的全过程,讨论动力系数计算方法及其取值.确定6种不同跨径下承式CFST标准拱桥在短吊杆、次短吊杆及长吊杆分别断裂时剩余吊杆及加劲纵梁的动力系数取值.研究结果表明:采用有限元软件MSC.Marc模拟下承式CFST拱桥吊杆断裂,最大误差仅为11.25%.各吊杆分别断裂时,拱肋和加劲纵梁各截面均为断裂吊杆所对应位置动力响应最大;剩余吊杆为断裂吊杆的相邻吊杆动力响应最大.下承式CFST拱桥剩余吊杆和加劲纵梁动力系数取值分别为1.75和1.80时,采用静力法计算结果与动力计算最大值基本一致,且计算结果偏于安全.This paper collects and analyzes the main parameters of 62 through concrete filled steel tube(CFST)arch bridges,and constructs six through CFST standard arch bridges with different spans.The finite MSC.Marc element software simulated the whole process of suspender fracture of the scale test model and the calculation method and value of dynamic coefficient are discussed.The dynamic coefficients of the remaining suspenders and the stiffened longitudinal beams of six through CFST standard arch bridges with different spans are determined when the short suspenders,the sub short suspenders and the long suspenders are broken respectively.The results show that the finite element software MSC.Marc is used to simulate the maximum error of 11.25%for the suspender fracture of through CFST arch bridge.When the suspenders are broken respectively,the dynamic response of the corresponding positions of the arch rib and the stiffening longitudinal beam is the largest.When the dynamic coefficients of the remaining suspenders and stiffening longitudinal beams of the through CFST arch bridge are 1.75 and 1.80 respectively,the results calculated by the static method are consistent with the maximum values calculated by the dynamic method,and the calculation results are safer.

关 键 词：吊杆断裂 下承式钢管混凝土拱桥 动力系数 有限元模拟 动力响应 

分 类 号：TU392.3[建筑科学—结构工程]