Buckling of steel column with box section considering residual stress under local fire

Abstract

Abstract In order to study the fire resistance performance of the box section steel column considering the welding residual stress under local high fire temperature, a finite element model of the box section steel column was established by using ABAQUS software, and the generation of welding residual stress was simulated. Based on the simulation results, the stable bearing capacity of the box section steel column considering welding residual stress under three kinds of local fire condition was analyzed. The results show that the tensile stress is highly concentrated in the weld seam, and the welding residual compressive stress with wide distribution and uniform amplitude is generated in other parts. Under the three kinds of local fire conditions, the stable bearing capacity of the component decreases with the increase of temperature. When the maximum temperature of the component is greater than 566 °C, the stable bearing capacity of the component decreases significantly, and the decline coefficient reaches 0.62. When the fire temperature is 436°C-658°C, the stable bearing capacity of the component is the least under condition 3, which is the most unfavorable condition of the component.