Materials constitutive analysis on local buckling damage description of steel frame members

In severe earthquake analysis, it is necessary to propose damage and degradation characteristics for improving the accuracy of line model. Therefore, it is important to accurately simulate local buckling damage and degradation with finite element method for parameter analysis. Appropriate constitutive model is needed. By comparing the results of using different constitutive models in ABAQUS with typical local buckling degradation tests, a steel constitutive model was proposed to accurately calculate the degradation of local buckling. Based on the calibrated model, damage and degradation factors of local buckling were discussed by parameter analysis; cumulative damage rules under different control factors were proposed, which provided a powerful tool for improving the accuracy of line model. The results showed that: flange and web width-thickness ratio and steel strength-yield ratio would seriously affect the local buckling damage and degradation. Flange width-thickness ratio had most significant effect on ultimate degradation. However, the yield strength had little effect on degradation process.