Research on Hysteretic Model of Damaged H-Section Steel Columns

Abstract

To address the insufficient consideration of residual deformation in traditional damage models for H-section steel columns, this study proposes a modified hysteretic model. Low-cycle cyclic loading tests were conducted on 5 Q355B H-section steel column specimens (HW150×150×7×10) to collect data on cumulative damage, residual deformation, and stiffness degradation. The classic Park-Ang model was modified by introducing residual deformation as a key parameter, and model parameters were calibrated using test data. Combined with trilinear skeleton curve fitting and adaptive hysteretic rules, a comprehensive hysteretic model was established. Verification results show that the model accurately predicts the hysteretic behavior and residual bearing capacity of damaged steel columns, with the error between simulated and test data within 8%. This research provides a reliable basis for seismic design and post-earthquake damage assessment of steel structures.