大跨斜拉桥模态测试与分析

首先介绍了利用环境随机振动法间接识别柔性结构模态参数的方法，并通过移动测点法对一斜拉桥现场测试结果进行了分析，分析得到移动测点法进行桥梁等大型结构的模态试验能得到较理想的结果，而且节约试验成本。通过建立三维有限单元模型，得到了该桥自振频率和振型的理论值。脉动实验测得的结构自振频率和振型与用三维有限单元模型得到的理论值的对比发现利用有限元对全桥进行模态分析，绝大部分模态吻合得较好。

Model Test and Analysis of Long-pan Cable-stayed Bridge

The approach for identifying the model parameters of a flexible structure by means of the random vibration of environments was presented.The approach of move the measuring ordering was applied to a cable-stayed and results of the test were analyzed.The result expressed that applying move the measuring ordering proceeding bridge model experiment can get rather ideal results and economize experimental cost.Results were compared with those obtained from model analysis based on a three-dimensional finite element model of the bridge.Good agreement was found.