冷弯薄壁C型钢双肢闭合拼合柱的极限承载力研究

Research on Ultimate Bearing Capacity of Cold-Formed Thin-Walled C-Section Steel Double-Limbed Closed Built-up Columns

为得到冷弯薄壁C型钢双肢闭合拼合柱的极限承载力的计算公式,采用有限条软件CUFSM以及直接强度法DSM计算得到单肢冷弯薄壁C型钢构件的极限承载力,并运用ABAQUS有限元分析软件计算出轴压作用下的冷弯薄壁C型钢双肢闭合拼合柱的极限承载力。通过对比不同截面几何参数下的单肢冷弯薄壁C型钢构件与冷弯薄壁C型钢双肢闭合拼合柱的极限承载力,分析得到各个参数对拼合柱组合效应系数的影响规律,确定出组合效应系数与两个重要参数的函数关系。采用1stopt拟合软件对大量已得到的组合效应数值进行回归分析,建立了冷弯薄壁C型钢双肢闭合拼合柱的组合效应系数简化公式以及极限承载力计算公式。

In order to obtain the calculation formula of the ultimate bearing capacity of cold-formed thin-walled C-shaped steel double-limbed closed built-up columns, the line software CUFSM and the direct strength method DSM were used to calculate the ultimate bearing capacity of single-limbed cold-formed thin-walled C-shaped steel member. ABAQUS finite element analysis software was used to calculate the ultimate bearing capacity of cold-formed thin-walled C-shaped steel double-limbed closed built-up columns under axial compression. By comparing the ultimate bearing capacity of single-limb cold-formed thin-walled C-shaped steel members and cold-formed thin-walled C-shaped steel double-limbed closed built-up columns under different cross-sectional geometric parameters, the influence of each parameter on the combined effect coefficients of built-up columns was determined, as well as the relations between combined effect coefficients and two important parameters. The 1stopt fitting software was used to perform regression analysis on a large number of obtained combined effect values, and the combined effect coefficient simplified formula and ultimate bearing capacity calculation formula of cold-formed thin-walled C-shaped steel double-limbed closed built-up columns were established.