模态曲率差法对梁结构的损伤诊断

首先在理论上证明模态曲率差法,对结构损伤识别的可行性,提出了用损伤前后的模态矢量差,来计算结构损伤因子矩阵的计算公式。为验证方法的正确性,采用一个标准梁算例给予验证,算例表明该方法对结构的损伤位置和损伤程度具有准确的识别能力。并在此基础上,根据两个线性假设,提出了一种可用于评价结构寿命的简易、有效的计算方法。

DAMAGE DIAGNOSIS OF BEAM STUCTURES BY MODAL CURVATURE DIFFERENCE METHOD

This paper verifies modal curvature difference method in theory at first, aiming at the feasibility of the damage recognition of structures. A matrix formula by using modal vector difference before and after damage is used to evaluate the damage factors of structures. A standard beam example is adapted to verify the proposed method. It is shown that the method is effective in diagnosing damage locations and degree. Additionally, according to two linear hypothesis of this paper, a simple and effective method is set up to evaluate the service life of structures.