关键词: 多梁式桥梁, 模态柔度, 模态柔度曲率, 损伤识别

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