基于曲率模态和柔度曲率的梁结构损伤识别

Damage Identification of Beam-type Structure Based on Modal Flexibility and Modal Curvature

选用模态柔度曲率差和曲率模态差进行损伤识别研究,提出一个基于曲率模态差的新指标。首先进行混凝土简支梁和三跨连续梁的损伤识别数值算例分析,然后以钢纤维混凝土简支梁为试验对象进行试验研究,最后通过数值与试验研究分析,结果表明,对于梁结构的损伤,曲率模态差较柔度曲率差更敏感;提出的基于曲率模态差的改进指标在一定程度上可以剔除曲率模态差的某些误判。

The flexibility curvature and modal curvature were applied to the damage identification,at the same time,an improved technique based on modal curvature was proposed.The effectiveness of the several selected damage identification techniques were examined by carrying on concrete beam damage identification numerical analysis and a steel fiber reinforced concrete simple beam test.It comes to the conclusions： The modal curvature is more effective than flexibility curvature in the damage identification of beam-type structure.The improved technique based on modal curvature can eliminate some errors caused by modal curvature to a certain extent.