连续梁桥静动载试验研究

Research on Static and Dynamic Load Test of Continuous Girder Bridge

为了评价在役桥梁的承载能力和技术状况,检验其实际状态和工作性能,本文对某预应力混凝土连续箱梁桥进行静动载试验分析。其间通过静载试验测试各控制截面的应力状态和挠度变形,通过脉动试验、无障碍行车试验和刹车、跳车试验研究桥梁的自振特性和阻尼比,分析不同车速、不同车况下结构的冲击系数,并依据相关规范对静动载试验结果进行评价。动静载试车分析表明,该桥的承载能力满足要求,具有一定的安全储备,结构处于良好的工作状态,可以继续正常使用。

In order to evaluate the carrying capacity and technical condition of the in-service bridge,and test its actual state and working performance,this paper conducts static and dynamic load test analysis on a prestressed concrete continuous box girder bridge.In the meantime,the stress state and deflection deformation of each control section are tested through static load test,and the natural vibration characteristics and damping ratio of the bridge are studied through pulsation test,obstacle-free driving test and braking and jumping test,and the impact coefficient of the structure under different vehicle speeds and different vehicle conditions is analyzed,and the static and dynamic load test results are evaluated according to relevant specifications.The analysis of the static and dynamic load test shows that the bearing capacity of the bridge meets the requirements,has a certain safety reserve,and the structure is in good working condition and can continue to be used normally.