四线铁路刚架系杆拱桥静动力性能试验研究

以广州枢纽四线铁路主跨160m刚架系杆拱桥为研究对象,对大跨度刚架系杆拱桥进行静动力性能试验,了解结构在荷载作用下的实际工作状态。静载试验选取该桥关键断面进行截面应力、挠度测试,通过有限元软件进行模拟仿真和试验验证,试验结果与理论分析相符;动载试验在列车以不同速度过桥时,对关键截面的横、竖向动力响应进行量测,并与相关规范进行对比,动力响应指标符合相关规范要求。结果表明:桥梁在列车荷载作用下,结构静动力特性良好,具有足够的强度和刚度。

Research on Static and Dynamic Performances of Rigid Frame Tied-arch Bridge on Four-line Railway

Based on a four-line railway rigid frame tied-arch bridge with main span of 160 m,the paper conducts the test of static and dynamic performances of bridges on high-speed railway to understand the actual working state of loaded structure,the stress of key section and the deflection of girder. The analysis results are verified by using the finite element method and experiment. Through dynamic loading tests,the horizontal and vertical dynamic response of key section when the train passes the bridge at different speed is measured. The dynamic response index of bridge accords with the requirements of correlative specifications. The results show that all measurement indicators of the bridge meet the requirements of the relevant norms,and the bridge under the loading of the train has good static and dynamic performances with sufficient strength and rigidity