Abstract: The damage identification method using the dynamically measured flexibility matrix to locate damages was studied. The changes in flexibility and flexibility curvature methods are adopted to identify damage. The qualitative analysis of testing noise on the detected result was also carried out. The multi -girder model that matches the real configuration of bridge structure was adopted to simulate the bridge damage. One numerical example analysis of a simplesupported multi-girders bridge was presented to demonstrate the effectiveness of the proposed methods. It is shown that the proposed approach has the potential of being a practical tool for a damage detection methodology applied to smart civil structures due to its excellent capability in dealing with the few measured mode shapes and frequencies.

Key words: multi-girder bridge, modal flexibility, change of modal flexibility curvature, damage detection

摘要： 讨论了利用量测的柔度矩阵定位损伤的方法。分别选用模态柔度和模态柔度曲率两种方法对多梁式T型梁桥的损伤识别进行研究;并定性分析了测试噪声对损伤识别结果的影响。为反映实际多梁式桥梁的损伤识别情况,采用符合实际多梁式桥梁结构构形的计算模型模拟结构损伤。通过一个简支多梁式T梁桥的数值试验验证了所提方法的可行性。结果表明在量测模态与频率数不多的情况下,所讨论的方法可用于识别多梁式桥梁的损伤。

关键词: 多梁式桥梁, 模态柔度, 模态柔度曲率, 损伤识别