相贯补强开洞冷弯矩形截面钢管短柱轴压性能研究OA

Cold-formed steel columns used in structures often have openings in the column body due to construction requirements,but openings in the tube will weaken the cross-section,resulting in a decrease in the bearing capacity of the members.In order to reduce the influence of openings,a reinforcement method using inner-sleeved intersecting steel tubes is proposed for perforated cold-formed rectangular steel tubular columns with circular openings.By using the finite element software ABAQUS,finite element models of perforated cold-formed rectangular steel tubular stub columns and the corresponding reinforced perforated cold-formed rectangular steel tubular stub columns with four different cross-sections were established.The failure mode,load-displacement curve,and axial compressive bearing capacity were analyzed by taking the opening size ratio and the width-to-thickness ratio of the plate as parameters.The results show that after the reinforcement of the intersecting steel tubes,the failure mode and stress distribution of the perforated tubular stub columns are effectively improved,and the bearing capacity is obviously improved.,The increase in bearing capacity increases with the increase of the opening size ratio,and increases first and then decreases with the increase of the width-to-thickness ratio.Based on the comparison between the analysis results and the calculation results of the direct strength method in the North American Specification for the Design of Cold-Formed Steel Structural Members(AISI S100-2016),a modified direct strength method was proposed.