Residual stresses of Q235 steel wallboard - Q460 high-strength steel column structural system

Abstract

For the wallboard - column structural system on the side of box-type steel structures, the residual stress distribution of the high-strength steel (HSS) column supported by stressed skin wallboards is affected by the welding between columns and wallboards, making it significantly different from an independent welded H-section member. To investigate and model the residual stress in Q235 steel wallboard - Q460 HSS column structural system, to which little attention has been paid, an experimental study was conducted using both the hole-drilling method and sectioning method. The residual stress magnitude and distribution were obtained. Comparison of the two measurement methods indicates that the maximum tensile residual stresses near the welds measured using the hole-drilling method are much greater than those obtained from the sectioning method. The welding between column and wallboards reduces the maximum tensile residual stress in the middle of column rear flange as well as the compressive stress distribution range in the rear flange. The magnitudes of compressive residual stresses decrease with increasing width-to-thickness ratio and component plate thickness, while no significant correlation with geometries was observed for the tensile stresses. The residual stresses in the combination of the rear flange and wallboards, front flange, and web can be regarded as being in self-equilibrium respectively. In addition, a simplified distribution model is proposed and compared with the experimental results. The new stress distribution model can provide a foundation for investigating the buckling behavior of HSS columns supported by stressed wallboards. • Residual stresses in Q235 steel wallboard - Q460 high-strength steel column structural system were measured. • Results obtained by the hole-drilling method and sectioning method were compared. • Effects of welding between wallboards and column, sectional dimensions, and the interaction among plates were investigated. • A simplified residual stress distribution model for the structural system was proposed.