梁结构的损伤识别方法研究

Study of Damage Detection Indictor for Beam Structure

针对桥梁结构多为简支梁和连续梁的形式,文章使用了柔度差法对梁结构的损伤识别进行了研究。文章首先分别推导了一阶振型变化率和柔度差的识别理论;然后使用ansys有限元分析软件对简支梁和连续梁进行了损伤数值模拟,并使用此两种识别指标进行损伤识别;最后比较了两种指标的识别效果。文章还对梁结构的多处损伤进行了研究。结果表明:对于梁结构柔度差法的损伤识别效果优于一阶振型变化率,且同样仅需少数的前几阶模态数据。

For the case of simple beam and continuous beam always being seen in bridge, in this paper method of difference of flexibility is used to detect damage o fbeam structure. At first, the author deduces the theory o fchange rate of the first mode shape and difference of flexibility for damage detection. Then, ANSYS, a Finite Element Analysis Software are used to simulate structural damage of simple beam and continuous beam. The two above damage indictors be used to locate the location of damage inbeam. At last, the results of damage detection are compared. In the paper, case of several damage of beam at the same time is studied. The result shows that for damage detection of beam the method of difference of flexibility is better than change rate of the first mode shape. In addition to, only few first mode data is need for damage detection.