Numerical Simulation of Longitudinal Residual Stress Distribution in Welded T-Section of Q690 High Strength Steel

Abstract

Welding longitudinal residual stress is one of the important factors affecting the overall stability of steel compression members. On ANSYS, the magnitude and distribution of longitudinal residual stress in welded T-section of Q690 high strength steel were numerically simulated and analyzed. By comparing with existing research results, a reasonable finite element analysis model was proposed. By using this model, the variation law of the magnitude and distribution of longitudinal residual stress with width thickness ratio and plate thickness was analyzed; The self-balance of residual stress of flange and web was studied; A longitudinal residual stress distribution model suitable for welded T-section of Q690 high strength steel was proposed. It can be seen from the research results that the proposed finite element analysis model is suitable for the study of longitudinal residual stress of welded T-section. Owing to the increase of the width thickness ratio and thickness of plate, the longitudinal residual compressive stress at the extended end of flange and the middle of web decreases. The longitudinal residual tensile stress at the intersection weld between flange and web and the extended end of web has little relationship with the width-thickness ratio and thickness of plate. The residual stress in each plate meets self balance. According to the analysis based on numerical simulation, the longitudinal residual stress distribution model of welded T-section of Q690 high strength steel can provide reference for subsequent residual stress experimental research and numerical analysis of the overall stability of compression bar.

Keywords

• q690 high-strength steel
• welded t-section
• longitudinal residual stress
• finite element
• thermal-structural coupling analysis