基于静载试验的大跨度独塔斜拉桥承载能力评定

Evaluation of Bearing Capacity of Long-Span Cable-Stayed Bridge with Single Pylon Based on Static Load Test

为研究大跨度独塔双索面斜拉桥成桥后,在合理的使用及加载形势下,能否满足荷载试验的要求。采用有限元软件建立全桥有限元模型,通过规范及设计图纸所给活荷载,制定桥梁结构荷载试验的检测方案,通过对重要位置及关键参数的现场检测,三种工况下应变校验系数最大为0.83,满足不大于1的要求,最大相对残余应变为7.14%,满足不大于20%的要求;挠度最大校验系数为0.80.满足不大于1的要求,最大相对残余应变为2.71%,满足不大于20%的要求;通过对比有限元软件计算的理论值和现场测得对应位置内力的方法,这种以理论联系实际评定桥梁结构承载能力的方法可供设计检测人员参考。

In order to study whether a long-span cable-stayed bridge with single tower and double cable planes can meet the design requirements under reasonable use and loading conditions.The finite element model of the whole bridge is established by the finite element software,and through the live load given by the code and the design drawings,the detection scheme of the bridge structure load test is worked out,and the important position and the key parameters are detected on the spot.By comparing the theoretical value calculated by the finite element software with the method of measuring the internal force at the corresponding position,the method of evaluating the bearing capacity of the bridge structure by combining theory with practice can be used as a reference for the design and inspection personnel.