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A two-stage method for truss beam damage identification using modal strain energy and frequency sensitivity

A two-stage method for truss beam damage identification using modal strain energy(MSE) and frequency sensitivity is presented in this paper. In the first stage, the changes of modal strain energy before and after the occurrence of damage are employed to locate the suspected elements; In the second stage, the frequency sensitivity method is used to determine the exact damage position further and quantify the damage extent. Finally, a numerical example of a simply supported truss beam model is given to verify the proposed method. Results show that the proposed method can effectively identify the structural damage location and describe the damage extent.