既有连续梁结构的动力荷载试验分析

Dynamic Load Test Analysis of Existing Continuous Beam Structures

随着汽车载重量和车流量的增加,为了保证桥梁结构的安全性,定期桥梁检查必不可少。拟采用动力荷载试验的手段,运用振动测试系统,采集环境激励作用下桥面竖向振动的加速度响应信号,并分析计算桥梁主体结构竖向振动的固有频率。结果表明:左幅桥实测频率小于右幅桥实测频率,右幅桥动力性能相对左幅桥较好且与静载试验结果相匹配,较好地反映了桥梁的实际状况。

With the increase of vehicle load and the traffic volume,in order to ensure the safety of bridge structure,regular bridge inspection is necessary.This paper intends to collect acceleration response signals of vertical vibration of bridge deck under environmental excitation by means of dynamic load test and vibration test system,and analyze and calculate the natural frequency of vertical vibration of bridge main structure.The results show that the measured frequency of the left bridge is less than that of the right bridge.The dynamic performance of the right bridge is better than that of the left bridge and matches with the static load test results.It reflects the actual situation of the bridge and is a dynamic load test.