简支多片空心板梁桥模态试验研究

Study on Modal Test of Simple-supported Multi-sheet Hollow Plate Girder Bridge

该文通过对205国道子牙新河北堤桥简支多片空心板梁桥进行冲击试验的实例,基于输出响应用随机子空间法进行了模态识别。模态试验结果表明:简支板梁桥的前3阶模态分别为纵向1阶竖弯、竖向扭转、横向竖弯和纵向2阶弯曲,与理论计算结果一致,可为相关的科研人员参考。

The article introduces the shock test of the simple-supported multi-sheet hollow plate girder bridge of Beidi Bridge on Ziyaxin River in 205 National Highway and the modal identification based on the output sound application of stochastic subspace method.The modal test result shows that the first three steps of mode for the simply-supported plate girder bridge are separately the longitudinal one-step vertical bending,vertical turn,transverse vertical bending and longitudinal two-step bending,which are identical with the theoretical computation result and can be referred for the relative scientific research members.