Study on Development of Ductile Failure Verification Method for Steel Structures

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This study is aimed to clarify behavior of ductile crack initiation and propagation in steel bridge piers subjected to cyclic loading, and to verify an evaluation method of ductile crack initiation using a damage index. For this purpose, cyclic tests were carried out and finite element analyses using shell and fiber models were performed. As a result, hysteretic plastic strain behavior at the base of specimens is clarified, and the ductile crack initiation is evaluated by the proposed damage index. Besides, the effects of welding defects on the seismic performance of steel beam-column members were investigated and future research needs were summarized.