某宽幅简支梁桥荷载试验研究  

Load Test Study of a Wide-Simple Supported Beam Bridge

作　　者：贾毅[1] 霍龙飞 李福海[1,2] 廖平 赵人达[1] JIA Yi HUO Longfei LI Fuhai LIAO Ping ZHAO Renda(School of Civil Engineering, Southwest Jiaotong University, Chengdu, China, 610031 National Engineering Laboratory for Technology of Geological Disaster Prevention in land Transportation, Chengdu, China, 610031)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]陆地交通地质灾害防治技术国家工程实验室,四川成都610031

出　　处：《沈阳建筑大学学报（自然科学版）》2017年第5期847-854,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51308471)

摘　　要：目的为全面了解某宽幅预应力混凝土简支空心板梁桥在荷载作用下的实际承载力,分析其实际工作状态,评定桥梁运营状况.方法基于静载试验,研究在偏载和中载等不利荷载工况下的主梁的应力和变形,通过动载试验的各项内容研究该桥的自振频率、不同行车速度下的变形响应以及跳车试验下的冲击作用,最后将实测结果与理论分析结果进行对比分析.结果桥梁在设计荷载下处于弹性工作阶段.卸载后归零情况正常,残余应变为5%~11%,没有裂缝产生.动力测试结果显示,其第一阶竖向自振频率为5.47 Hz、阻尼比为0.025、冲击系数为1.122~1.190,测试模态与理论模态吻合较好.结论该桥受力处于弹性工作状态,承载能力满足相关规范要求,可以按设计荷载投入使用.In order to fully understand the actual bearing capacity,analyze its actual working state and evaluate and the operation status of the bridge of a wide width prestressed concrete simply supported hollow slab bridge under load,a loading test is done. Based on the static load test, the stress and deformation of the main beam under the load and medium load are studied; through the contents of the dynamic load test, the natural frequencies of the bridge, the deformation of the different speed and the impact of the jump test are studied. Finally, the measured results and theoretical analysis results are compared and analyzed. The displacement test results show that the bridge is under the elastic working stage in the design load. After unloading, the zeroing condition is normal, the residual strain is 5% ~ 11%,and no cracks occur. The dynamic test results show that the first vertical natural vibration frequency is 5. 47 Hz, the damping ratio is 0. 025,and the impact coefficient is 1. 122 ~ 1. 190. The testing model agrees well with the theoretical mode. The results show that the bridge is in the elastic working state,carrying capacity to meet the requirements of the relevant specifications,can be put into use according to the design load.

关 键 词：荷载试验 简支板梁桥 静载试验 承载能力 校验系数 效率系数 

分 类 号：TU395[建筑科学—结构工程]