基于系统最小实现的结构损伤识别试验研究

Experimental research of structural damage identification based on system minimum realization

基于系统最小实现,在不求解结构模态参数的前提下,提出一种新的结构损伤识别方法,为结构损伤识别提供一种新的思路.通过实测结构响应数据建立待识别结构的系统最小实现矩阵;利用2-范数将系统最小实现矩阵(包含结构信息)凝聚成一个模式向量,进而得到该模式向量对结构参数变化的灵敏度;最后通过建立灵敏度矩阵,对结构损伤位置以及损伤程度进行识别.通过一个5层框架模型试验分析,表明该方法具有一定的可行性.

Based on system minimum realization, a new method for structural damage identihcatlon was proposed on the premise that solution for modal parameters is unnecessary and a new idea was provided for identification of structural damage. First of all, system minimum realization matrices of to-be identified structure were set up by measuring structural response data; Secondly, system minimum realization ma- trix （including the structure information） were condensated into pattern vector by using 2-norm, and then, the sensitivity of the pattern vector to the variation of the structural parameters were obtained. Fi- nally the sensitivity matrix was established and the identification of damage location and severity of the structure was conducted. A five-storey frame was taken as an example to verify the proposed method and it is shown that this method can be used to identify the structural damage to a certain extent.