Method for Evaluating Damage Caused to Steel Columns by Local Buckling

摘要

In this study the process by which a steel column subjected to strong and repeated loading undergoes failure is investigated. Furthermore, a damage index is developed by using factors related to damage along with a relevant analysis method. A cantilever-type box-type steel member, which is assumed to undergo buckling deformation, is used for the analysis. A nonlinear analysis with repeated displacement control is conducted by applying a compressive load that leads to failure along with a predetermined compressive load to the steel member. The main variables considered in this analysis are the load stock pattern and the type of steel (SS400, SM570, and Posten 80). The influence of each variable on the failure mode, deformation capacity, and damaging process is described. The failure processes for each type of steel are compared. The results indicate that the failure of a steel member under strong repeated loading is governed by local buckling and that the failure of a steel member is directly related to the local strain.