在役高速公路大跨度斜拉桥荷载试验研究

Load test research on large-span cable-stayed bridges on in-service highways

淮安大桥为大跨度双索面斜拉桥,已服役18年,为掌握大桥当前结构状态和受力性能,对大桥进行荷载试验,针对主梁最大正负弯矩、主塔最大弯矩、主梁挠度、塔偏等设计加载工况。结果表明,淮安大桥测试截面的平均应变、挠度及塔顶偏位的校验系数均处在合理范围内,相对残余均小于20%,大桥处于弹性工作阶段,受力性能良好,满足设计荷载的正常使用要求。

The Huai an Bridge is a large-span double cable plane cable-stayed bridge that has been in service for 18 years.In order to understand the current structural state and stress performance of the bridge,load tests were conducted on the bridge to design loading conditions such as the maximum positive and negative bending moment of the main beam,the maximum bending moment of the main tower,the deflection of the main beam,and tower deviation.The results show that the average strain,deflection,and tower top deviation calibration coefficients of the test section of Huai an Bridge are all within a reasonable range,with relative residual values less than 20%.The bridge is in the elastic working stage,with good stress performance,and meets the normal use requirements of the design load.