Isolated substructure model updating based on local static test
Yang Qiu-wei1, Liu Ji-ke2
1.Department of Civil Engineering, Shaoxing University, Shaoxing, 312000, China;
2. Department of Mechanics, Zhongshan University, Guangzhou 510275, China
Abstract： For large-scale structures, measurement and identification for a whole structure are very difficult and the accuracy of the estimates is rarely reliable. In general, only some local substructure model is important and it is not necessary to update the whole structure. From such a viewpoint, this paper studied the isolated substructure method for model updating and damage detection. It aims at updating local substructure element stiffness by using the static response at the corresponding substructure location of the whole structure. Firstly the isolated substructure is formed by applying virtual fixed support (numerically and not physically) on the substructure boundary, to obtain the local flexibility matrix of the isolated substructure. Then the new flexibility perturbation method is used to modify the model of the isolated substructure, which can accurately compute the stiffness modification coefficients only by simple computation without any higher-order approximation or iteration. A plane truss structure is analyzed as a numerical example to verify the present method. Results show that the substructure could be updated successfully by using the static displacement response at the corresponding substructural location even with 3% noise.
杨秋伟;刘济科. 基于局部静力测试的约束子结构修正法[J]. , 2012, 31(9): 39-43.
Yang Qiu-wei;Liu Ji-ke. Isolated substructure model updating based on local static test. , 2012, 31(9): 39-43.
2012, Vol. 31 
