车载试验法评定旧钢筋混凝土连续梁桥承载力

Evaluation of Bearing Capacity of Existing Reinforced Concrete Continuous Girder Bridge by Track Tests

通过对一座无设计资料旧桥现场汽车加载试验，进行静态、动态测试及材料强度测定，估算出控制截面的纵向受拉钢筋数量和正截面抗弯承载力．实测和理论分析结果表明，该桥支座截面抗弯承载力较高，而跨中截面承载力较低．按道路改造设计要求跨中截面必须加固．此次车载试验结果为此类旧桥承载力评定提供了具有一定参考价值的数据．

In this paper,the results of track test of a bridge with one simple span and four continuous spans, having no available design data are presented.According to testing results which include static,dynamic tests and the strength of concrete and steel bars,the number of tension steel bars and the moment at control section are evaluated.The testing results and theoretical analysis show that bearing capacity at pad section of this bridge's the is high. But its capacity at middle section is lower.In order to keep on use at high load grade,the capacity at middle section must be strengthened.And the testing results in this paper provide valueable reference data for analysing this kind of exsiting bridge.