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原文传递 Experimental and Analytical Study of Flexural Buckling of Cold-Formed Steel Quadruple-Limb Built-Up Box Columns

题名：	Experimental and Analytical Study of Flexural Buckling of Cold-Formed Steel Quadruple-Limb Built-Up Box Columns
正文语种：	eng
作者：	Yang, Jingjie;Xu, Lei;Shi, Yu;Wang, Weiyong
作者单位：	Chongqing Univ Sch Civil Engn Chongqing 400045 Peoples R China;Univ Waterloo Dept Civil & Environm Engn Waterloo ON N2L 3G1 Canada;Chongqing Univ Sch Civil Engn Chongqing 400045 Peoples R China;Chongqing Univ Sch Civil Engn Chongqing 400045 Peoples R China
关键词：	Cold-formed steel (CFS);Built-up section;Flexural buckling;Column
摘要：	To better understand the mechanical behavior of cold-formed steel (CFS) quadruple-limb built-up box-section (QBB) columns associated with flexural buckling, 12 axial compression tests with different slenderness ratios and screw spacing were conducted. The test results showed that, for a slender specimen (L=2,700 and 3,300 mm), when the screw spacing was reduced from 600 to 300 mm, the load-bearing capacity increased by about 6%-10%. When the screw spacing was reduced from 600 to 150 mm, the load-bearing capacity increased by about 14.6%-17.5%. Arranging end fastener groups can enhance the strength of the column, but it may be cumbersome and uneconomical. A finite-element model (FEM) was developed and calibrated against the test results. A series of parametric analyses was carried out to investigate the effects of the screw spacing and shear stiffness on the elastic buckling load and ultimate load-bearing capacity. Finally, a practical design method was proposed to evaluate the column's elastic buckling load and load-bearing capacity associated with flexural buckling. Compared with the simulation and test results, the proposed design method was accurate at predicting the load-bearing capacity of the specimens, with a relative difference of less than 6%. (C) 2021 American Society of Civil Engineers.
出版年：	2022
期刊名称：	Journal of structural engineering
卷：	148
期：	1
页码：	04021228.1-04021228.16