中小跨径桥梁荷载试验定点常荷载加载方式研究

Research on Fixed-point-load Loading Mode of Load Test for Medium- small Span Bridges

针对桥梁荷载试验加载方式,提出了定点常荷载加载方式,即选定桥梁1/8L(或3/8L)、1/4L和1/2L(或测试断面)三个固定点位,保持加载车数量及车重不变,通过改变车辆在桥上的位置实现测试断面的分级加载。通过实际工程验证了该加载方式在保证试验准确性的同时,可以大幅提高试验加载效率,有效减少交通封闭时间,可在中小跨径桥梁的荷载试验中广泛推广应用。

The fixed-point-load loading method is proposed for bridge load test,L/8(or 3L/8)and L/4 and L/2 three fixed points are selected.Keeping the number and the weight of loaded vehicles unchanged,changing the position of the vehicle on the bridge to realize the step loading.The actual engineering proves that the fixed-point-load loading method can greatly improve the loading efficiency and effectively reduce the traffic closure time while ensuring the test accuracy.It can be widely promoted in the load test of medium-smal span bridges.