Mechanical Behavior of Damaged H‐Section Steel Structure

Abstract

Steel structures are usually damaged by disasters. According to the influence law of the damage on the elastic modulus of steel obtained by the mechanical test of damaged steel, the average elastic moduli of H-section steel members were analyzed. The equations for calculating the average elastic moduli of damaged H-section steel members at different damage degrees were obtained. By using the analytical cross-sectional method, the cross-sectional M-Φ-P relationships and the dimensionless parameter equations of the H-sections in the full-sectional elastic distribution, single-sided plastic distribution, and double-sided plastic distribution were derived. On the basis of the cross-sectional M-Φ-P relationships and dimensionless parameters of actual steel members, the approximate calculation equations for the damaged cross sections were obtained. The Newmark method was used to analyze the deformation of damaged steel columns. Analytical results show good agreement with the test results. The equations and methods proposed in this study have high computational accuracy, and these can be applied to the cross-sectional M-Φ-P relationships and deformation calculation of damaged steel members.

Mechanical Behavior of Q460 High‐Strength Steel under Low‐Cycle Fatigue Loading

“…Nie et al [7] studied the mechanical properties of steel on cold-formed steel (CFS) structures at high temperature and proposed constitutive relationship models based on the test data of S350, S420, and G500 steel, respectively. Hu et al [8] analyzed the average elastic modulus of H-beam members according to the influence of damage on the elastic modulus of steel obtained from the mechanical test of damaged steel. e formulas for calculating the average elastic modulus of damaged H-beams under different damage degrees were calculated.…”