き裂を有する平面骨組構造のGAによる逆解析 : (ティモシェンコはり理論に基づく逆解析)

抄録

In this paper a crack identification method of plane frame is presented using both genetic algorithm (GA) and FEM. The crack is simulated by an equivalent rotational spring model. On the basis of this approximate model, the stiffness matrices of a cracked element are developed employing the Timoshenko beam thory. In order to calculate the natural frequencies of the frame, which are required to identify of the crack location and depth from frequency measurements, FEM program including the cracked element is written. The depth and the position of the crack in the plane frame are estimated by using these natural frequencies and GA. The proposed method is verified by numerical simulation of some sample problems.