Abstract
The study is based on the modal strain energy method. Using the basic theory of the modal strain energy method, an index which is suitable for damage identification in girder road and bridge structures can be achieved. In this paper a continuous beam bridge is taken as an example. It is assumed that the structure has damage in different locations and to varying degrees, and the formal five modes of the structure can be obtained through ANSYS software, which is used to perform finite element analysis. The corresponding program composition with MATLAB is used to calculate the damage index. Thus, the structural damage of the continuous beam bridge can be detected. The results show that the damage index based on the modal strain energy method can accurately locate structural damage and quantify the damage level.
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