某上承式箱形拱桥荷载试验研究  

Load Test Study of a Top-bearing Box Arch Bridge

作　　者：毛永康 宁晓骏[1] 毛德均 侯庆 Mao Yongkang;Ning Xiaojun;Mao Dejun;Hou Qing(Faculty of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650500,China;School of Architecture and Civil Engineering,Kunming University,Kunming 650214,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]昆明学院建筑工程学院,昆明650214

出　　处：《科技通报》2024年第8期74-79,共6页Bulletin of Science and Technology

基　　金：昆明学院引进人才科研项目(XJ20220031);2023年云南省“三区”科技人才项目(ZX20230237);2023年云南省科技特派员项目(ZX20230180)。

摘　　要：为探究某评定标度为4类桥的上承式箱形拱桥的实际承载力,确定该桥的实际受力状况,为后期的加固研究和监控提供科学依据。本文采用现场荷载试验结合有限元分析的方法获取实测值和理论值,静动载试验分别测量挠度、应变和自振特性、冲击系数等参数,再引入静力荷载试验效率和校验系数等参数判定结构特性是否仍满足荷载为公路Ⅰ级的要求。结果表明:部分工况挠度校验系数和应变校验系数不满足规范中0.50<η≤1.00和0.50<η<0.90,但都满足不大于1的要求,表明结构刚度尚有富余;且相对残余挠度和相对残余应变都在20.0%以内,表明结构尚处于弹性范围工作;脉动、跑车和跳车试验结果显示结构的整体刚度优于理论,动力性能良好,且行车平顺。In order to investigate the actual bearing capacity of a top-bearing box arch bridge with an evaluation scale of category 4,the actual stress condition of the bridge is determined to provide a scientific basis for the later reinforcement research and monitoring.The field load test combined with finite element analysis is used to obtain the measured and theoretical values,and the static and dynamic load test measures the deflection,strain and self-oscillation characteristics,impact coefficient and other parameters,and then introduces the static load test efficiency and checking coefficients and other parameters to determine whether the structural characteristics still satisfy the requirements of the loading of HighwayⅠ.The results show that:The deflection calibration coefficient and strain calibration coefficient of some conditions do not meet the requirements of 0.50<η≤1.00 and 0.50<η<0.90 in the specification,but they all meet the requirements of not greater than 1,indicating that the structural stiffness is still rich;And the relative residual deflection and relative residual strain are both within 20.0%,indicating that the structure is still in the elastic range;The pulsation test,running car and jumping car test show that the overall stiffness of the structure is better than the theory,the traveling smoothness and good dynamic performance.

关 键 词：箱形拱桥 荷载试验 校验系数 动力特性 承载力分析 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]