基于模态曲率改变率的拱桥损伤识别

Damage Identification of Arch Bridge Based on Modal Curvature Index

针对拱肋单元不同位置同一单元的不同损伤、不同单元同一损伤的情况进行研究分析,通过有限元分析,研究了改进的模态曲率改变率对损伤识别结果的影响和敏感性分析,对桥梁结构损伤情况的识别方法进行了研究。以一座下承式拱桥作为模型进行试验,发现:拱肋在同一单元发生不同程度损伤时,改进的模态曲率改变率法的损伤指标IMCI发生了突变;拱肋在不同单元发生同一损伤时,改进的模态曲率改变率指标也会发生突变,说明该方法能够比较准确、有效地对结构损伤进行识别。

Damage identification for bridge structures is important in bridge structure safety detection . By im-proved modal curvature as parameters for damage judgement , the method of bridge structure damage is studied . An arch bridge is studied as an example .Calculation results under different damage situations are analyzed and shows that the proposed method is able to identify damage accurately and effectively .