钢管混凝土桁梁—格构墩轻型桥梁车振性能分析  

Vehicle vibration analysis of lightweight bridge with CFST composite truss girder and lattice pier

作　　者：黄育凡 吴庆雄[1,2] 袁辉辉 HUANG Yu-fan;WU Qing-xiong;YUAN Hui-hui(College of Civil Engineering,Fuzhou University,Fuzhou 350116,China;Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering,Fuzhou 350116,China;Key Laboratory of Civil Engineering of Fujian Province University,Fuzhou 350116,China)

机构地区：[1]福州大学土木工程学院,福建福州350116 [2]福建省土木工程多灾害防治重点实验室,福建福州350116 [3]工程结构福建省高校重点实验室,福建福州350116

出　　处：《广西大学学报（自然科学版）》2018年第4期1640-1650,共11页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51608125;51678154;51508104);福州大学科研启动基金(0050-510261)

摘　　要：为研究钢管混凝土组合桁梁—格构墩轻型桥梁在车辆荷载作用下的响应特性,以干海子特大桥为研究对象,采用考虑路面不平整的桥梁与车辆相互作用力学模型,对轻型桥梁的恒活载作用比例、基本动力特性以及移动车辆作用下的动力性能进行分析,并对冲击系数和行车舒适性进行讨论。研究结果表明,采用双轴车辆模型可较保守地评价轻型桥梁的动力特性,其动力响应随着车速增大而增加;移动车辆作用下,干海子特大桥主要产生竖向与横向振动,其卓越频率分别为2.501 Hz与0.275 Hz,多车作用下的动力响应远大于单车作用;干海子特大桥活载作用比例较常规钢筋混凝土桥梁有较大幅度增加;数值计算得到的干海子特大桥冲击系数略低于按规范计算得到的结果;建议采用Sperling指标和小堀·梶川指标进行干海子特大桥的行车舒适度评价。The dynamic response of Ganhaizi Bridge(a lightweight bridge with CFST composite truss girder and lattice pier)under vehicle loads is investigated.Based on the bridge-vehicle interaction model considering road roughness,the ratio of constant to live load and the dynamic properties are analyzed.Moreover,the impact coefficient and riding comfort are discussed.Results indicate that the dynamic characteristics of lightweight bridge can be evaluated conservatively by using the bi-axial vehicles model.The dynamic response of lightweight bridge rises with vehicle speed.Under running vehicles,the predominant vertical and lateral frequencies of the bridge are 2.501 Hz and 0.275 Hz,respectively.The dynamic response of the bridge under multi vehiclesaction is much larger than that under single vehicles.Compared with regular RC bridges,the ratio of live load is much larger.The impact coefficient calculated by the numerical calculation is slightly lower than that by the specification.The Sperling and Kobori-Kajikawa indicators are recommended to evaluate the riding comfort of lightweight bridges.

关 键 词：钢管混凝土 桁梁 格构式高墩 车桥相互作用 行车舒适度 

分 类 号：U44[建筑科学—桥梁与隧道工程]