对结构多位置损伤定位分析方法的探讨

Investigations on Identification Methods of Structural Multiple Damage Location

从理论上计算了几种多位置损伤检测方法对结构刚度的敏感度,选用工程上常见的矩形等截面悬臂梁,通过实验模态,对梁损伤引起的模态频率迁移进行了分析,从实验角度对这几种方法的敏感性和有效性进行了比较,并就它们在实际应用中的不足之处进行了讨论。实验结果表明,基于应变模态的损伤指标对承弯结构的损伤更敏感。

Modal analysis technology draws more and more attention in the development of structural damage detection. In this paper, the sensitivities of several multiple damage detection methods were calculated. A cantilever beam of rectangular cross-section was studied by using modal analysis experimentally. The shift of modal frequency caused by structural damage was analyzed. The methods above mentioned were applied to the experiments and their efficiency were demonstrated through several damage simulations. Principal shortcomings in these methods were also discussed. The results indicated that the strain index is more sensitive to damage than the displacement one for bending structures.