环境随机激励下斜拉桥的模态分析

文章首先给出了利用环境随机激励实际工程结构输出响应自功率谱间接识别柔性结构模态参数的方法，并运用它对一斜拉桥现场测试结果进行了分析。然后建立了三维有限单元模型，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，绝大部分模态吻合得较好，特别是竖向振型

Modal Analysis of Cable stayed Bridge by Vibration Measurements under Ambient Excitation

An approach for identifying the modal parameters of a civil engineering structure by means of the self power spectrum analysis of its output response under the random excitation of environments is presented. The approach is applicated to a 750m cable stayed bridge. Results are compared with those obtained from numerical analysis based on a three dimensional finite element model of the bridge. Good agreement is found, especially for those vertical modes.