公路钢拱塔斜拉桥车致振动试验与数值分析  

Testing and Numerical Analysis of Vehicle-Induced Vibration of a Highway Cable-Stayed Bridge with Steel Arch Pylons

作　　者：李鑫[1] 梁力[1] 王福春[2] 陈开利 

机构地区：[1]东北大学土木工程研究所,辽宁沈阳110004 [2]沈阳市市政工程设计研究院,辽宁沈阳110015 [3]中铁大桥局桥科院有限公司,湖北武汉430034

出　　处：《桥梁建设》2011年第4期37-40,56,共5页Bridge Construction

摘　　要：为了研究沈阳市三好桥(公路钢拱塔斜拉桥)在汽车荷载作用下的动态响应,通过测试得到不同速度的车辆通过时桥梁的竖向振幅和冲击系数,通过数值分析得到不同阻尼桥梁相应的动态响应和动力放大系数。分析结果表明:桥面平整的桥梁可采用数值方法计算桥梁的动态响应及其动力放大系数;主梁的位移和弯矩的冲击系数与车速呈波动变化,塔根弯矩的冲击系数、斜拉索和水平索最大索力和应力幅的冲击系数随着车速的增大而增大;不考虑阻尼时,桥梁各响应量的冲击系数的值偏大;考虑阻尼比时,各响应量的冲击系数随着桥梁阻尼比的增大而减小;阻尼比较小的桥梁,阻尼比对其动力响应影响较小。To study the dynamic response of the Sanhao Bridge （a highway cable-stayed bridge with steel arch pylons） in Shenyang City under the action of vehicle load, the testing was made and the vertical vibration amplitude and impact factors of the bridge when vehicles passed at different speed were obtained. The numerical analysis was made further and the corresponding dynamic response and dynamic amplification factors of the bridge with different damping were ob- tained as well. The results of the testing and analysis reveal that for the bridge with even deck, the numerical method can be used to calculate the dynamic response and dynamic amplification factors. The displacement and the impact factors of bending moment of the main girder fluctuate with the vehicle speed, the impact factors of bending moment of pylon footings, the maximum ca- ble forces of stay cables and horizontal cables and the impact factors of stress amplitude increase with the increase of the vehicle speed. When the damping is not taken into account, the values of the impact factors of various response variables of the bridge are slightly great, however, when the damping is taken into account, the impact factors of the response variables will decrease with the increase of the damping of the bridge. For the bridge with low damping ratio, the damping ratio will have little influence on the dynamic response of the bridge.

关 键 词：斜拉桥 车致振动 跑车试验 冲击系数 有限元法 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U446.1[交通运输工程—道路与铁道工程]