Scholarlink

<p>A novel cold-formed steel (CFS) built-up closed L-section column (CSBC-L) is proposed, which consists of two irregular sections connected with screw connections and can be used for mid-rise CFS buildings. This paper investigates the nonlinear behavior of the CSBC-L under axial compression. A numerical model is developed considering initial geometric imperfections, material nonlinearity, and the interaction performance between screws and components. The numerical model accurately predicts the ultimate capacity, buckling mode, and stiffness degradation phenomena well. The maximum errors in the ultimate capacity between the finite element simulation and experimental test results were no more than 11.8%. Furthermore, the effects of various parameters, such as the slenderness ratio, height-thickness ratio of the web, and screw spacing, on the axial performance of the CSBC-L specimens are investigated through parametric analyses. The ultimate capacity is significantly affected by the slenderness ratio and web height-thickness ratio. With varying screw spacing from 150 to 750&#xa0;mm, most specimens demonstrate adequate jointing effectiveness, with most specimens showing a reduction of up to 3% with increasing screw spacing. The experimental and numerical results are compared with the predicted ultimate capacity calculated by the current codes. The direct strength method (DSM) specified in the current AISI standards is overly conservative for predicting the ultimate capacity of built-up closed L-section columns. Finally, correction factors are proposed to modify the current calculation. The maximum error for the modified calculation is changed from 25% to no more than 16%, and it can be used for the compressive design of the CSBC-L.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Buckling failure mechanism and mode-informed design of CFS built-up closed L-section columns to compressive loads

  • 期刊论文

  • 发表日期：

    2025年12月9日

查看全文
  • Huichao Han,
  • Shizhong Zhou,
  • Liqiang Jiang,
  • Yi Hu,
  • Zhibin Zhang,
  • Lele Cai,
  • Jihong Ye,
  • Yibin Wu

摘要

A novel cold-formed steel (CFS) built-up closed L-section column (CSBC-L) is proposed, which consists of two irregular sections connected with screw connections and can be used for mid-rise CFS buildings. This paper investigates the nonlinear behavior of the CSBC-L under axial compression. A numerical model is developed considering initial geometric imperfections, material nonlinearity, and the interaction performance between screws and components. The numerical model accurately predicts the ultimate capacity, buckling mode, and stiffness degradation phenomena well. The maximum errors in the ultimate capacity between the finite element simulation and experimental test results were no more than 11.8%. Furthermore, the effects of various parameters, such as the slenderness ratio, height-thickness ratio of the web, and screw spacing, on the axial performance of the CSBC-L specimens are investigated through parametric analyses. The ultimate capacity is significantly affected by the slenderness ratio and web height-thickness ratio. With varying screw spacing from 150 to 750 mm, most specimens demonstrate adequate jointing effectiveness, with most specimens showing a reduction of up to 3% with increasing screw spacing. The experimental and numerical results are compared with the predicted ultimate capacity calculated by the current codes. The direct strength method (DSM) specified in the current AISI standards is overly conservative for predicting the ultimate capacity of built-up closed L-section columns. Finally, correction factors are proposed to modify the current calculation. The maximum error for the modified calculation is changed from 25% to no more than 16%, and it can be used for the compressive design of the CSBC-L.