应变振型损伤特征量在混凝土结构损伤诊断中的应用

APPLICATION OF RECOGNITION INDICES BASED ON DISPLACEMENT MODE SHAPES AND STRAIN MODE SHAPES TO CONCRETE STRUCTURE FAULT DIAGNOSIS

为检测混凝土构件损伤的出现、损伤位置及损伤程度 ,本文利用位移振型特征量推导了相应的应变振型特征量 ,并利用Matlab软件编制了混凝土悬臂梁的有限元振动计算程序 ,对混凝土悬臂梁在发生损伤前后的位移和应变振型特征量进行了仿真计算。结果表明 ,位移和应变振型特征量均可确定混凝土悬臂梁上存在的损伤 ,并可确定损伤位置。应变振型特征量较位移振型特征量对损伤更敏感 ,可用于混凝土构件的损伤检测。

To detect fault in concrete structures,two recognition indices based on strain mode shapes are derived from two indices based on displacement mode shapes respectively and applied to diagnosis.It is demonstrated by analysis on clamped uniform beam that the four indices can predict damage location and the two indices based on strain mode shapes are more sensitive to damage than that based on displacement mode shapes.Results of the digital simulation show that the approach can be used into practical structural fault diagnosis effectively.