类COMAC指标在桥梁损伤识别中的应用研究

Research on COMAC-like Indicator for Bridge Structure's Damage Detection

为了研究桥梁结构损伤并探索损伤识别指标,提出基于应变频响函数的参数COMACsfrf作为损伤识别指标。在此基础上采用有限元方法,以一简支板为仿真算例,以结构模型的单元刚度衰减来模拟损伤。结果表明:CO-MACsfrf对损伤的敏感程度高于由振型、应变等推演出的特征指标;该方法可用于结构损伤定位以及定性评价多处损伤。

To study bridge structural damage and damage detection index,a structural damage method with strain frequency response function（COMACsfrf） as damage detection parameter was presented.In the simulation example,a simple-supported plane is damaged by decreasing several elements bending stiffness on predefined location.The results show that the COMACsfrfis sensitive to damage than the methods,such as modal shape and modal strain.The presented method can be applied to location of structural damages as well as identification of damage severity.