结构损伤识别中灵敏度法的改进

IMPROVED STRUCTURE DAMAGE DETECTION METHOD BASED ON SENSITIVITY ANALYSIS

针对原有灵敏度法对复杂结构损伤识别中存在的不足(误判损伤位置和高估损伤程度),本文对其进行了改进。改进后的方法仅利用结构损伤前后的前两阶模态参数即可确定结构损伤的位置并评估结构损伤的程度。为验证改进后方法的有效性,利用二维钢架结构有限元模型数值模拟了五种典型的损伤工况,用原有灵敏度法和改进后的方法进行了识别。结果表明,与原有灵敏度法相比改进后的方法提高了结构损伤识别的精度,并且该方法简便,有望应用于实际结构中。

An improved method is presented in order to remedy the disadvantages of the existing sensitivity methods, such as: false detection of damage locations and high severity estimation error. The improved method is provided with the ability of accurate detection of damage locations and small severity estimation error. To verify the utility of the improved method, five damage cases are simulated with a numerical model (FEM) of two-dimensional plane steel structure and both the existing sensitivity analysis method and the improved method are applied to detect these cases. The results illustrate that the improved method is accurate in damage localization and in severity estimation. Comparing with the existing methods this method is simpler and feasible.