破损状态下斜拉桥模态参数的识别

Distinguishing Mode Parameter of Cable-stayed Bridge under Disrepair Status

该文以自由交通流作为环境振源对永和斜拉桥动力特性进行测试,对其使用15a后的模态参数进行识别,结果表明,采用该文提出的方法避免了由于禁止车辆通行、采样时间长等问题给环境随机振动测试带来的困难,具有很大的优越性,其测试数据可作为斜拉桥破损状态下的动力指纹,可为结构在线健康监测提供技术支持。

The article takes the free traffic flow as the environmental vibrating source to test the dynamic characteristic of Yonghe Cable-stayed Bridge,and distinguishes its mode parameter used after 15a.The result makes clearly that the method used in the article can avoid the difficulties brought to the random vibrating test of environmental because of the problems of no traffic and long sampling time,and has the great superiority.Its test data can be taken as the dynamic finger mark of ca-ble-stayed bridge under the disrepair status,and can provides the technical support for the on-line health monitor of structure.