网架结构损伤杆件的分区查找法

System identification for structural damage of space grids

为了解决结构损伤的系统识别问题,利用子结构修正的概念,提出了将刚度矩阵分块,分区查找受损杆件的方法。以某市新华大厦新闻发布厅网架结构为工程背景计算,损伤区域能毫无遗漏地被识别出来,所提出的方法是可行的,分区查找的结果一般可以使待识别杆件数减少60%～70%。

Space grids accumulate damage gradually during their service life. The detection and diagnosis of structural damage becomes very important. But in rea l structural projects, it is unknown which part of the structure is damaged and all the poles are to be identified. As a result, the test data are rather less t han structural parameters. The study finds out the damaged poles section by sect ion by dividing the stiffness matrix into some submatrixes. The space grid struc ture of news release hall of Nanjing Xinhua mansion is to be chosen as an engine ering example to demonstrate that the demonstrated area can be totally detected. Consquently, the method is feasible and the number of the poles to be identified can be reduced by 60%~70%.