In order to facilitate connections between the columns and beams and bracings, the cold-formed steel column members are furnished with patterned perforations in both longitudinal and lateral directions. The buckling behavior of the columns depends on various factors such as the length, cross-section geometry, and member as well as element slenderness. The cold-formed steel stub columns are generally more susceptible to failure by local buckling or yielding because of their higher global and distortional buckling capacities and relatively higher element slenderness. As the element slenderness depends on its effective flat width, the presence of perforations which leads to a reduction in effective flat width, might modify the strength characteristics of the member. Even though the current design procedures and existing literature have accounted for the effect of a slotted hole in the web of the cross-section, the patterned perforations in columns, which are more practical, would show a different effect from discrete holes. Hence, the research work has been focused on investigating the influence of different configurations of patterned perforations on the load-carrying capacity of the cold-formed steel lipped channel stub columns, which fails only after local buckling. The specimens were selected with trapezoidal perforations in the web with different spacings in lateral and longitudinal directions as well as varying web depth to flange width ratio and non-dimensional slenderness ratio. The numerical investigation was conducted using the finite element method with Abaqus software. The numerical results from the extensive parametric study were compared to the Direct Strength Method (DSM) design techniques.

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

Numerical Study on the Influence of Perforation Spacing in the Cold-Formed Steel Compression Members Undergoing Local Buckling

  • Amoke Shabhari,
  • Vijaya Vengadesh Kumar Jeyapragasam

摘要

In order to facilitate connections between the columns and beams and bracings, the cold-formed steel column members are furnished with patterned perforations in both longitudinal and lateral directions. The buckling behavior of the columns depends on various factors such as the length, cross-section geometry, and member as well as element slenderness. The cold-formed steel stub columns are generally more susceptible to failure by local buckling or yielding because of their higher global and distortional buckling capacities and relatively higher element slenderness. As the element slenderness depends on its effective flat width, the presence of perforations which leads to a reduction in effective flat width, might modify the strength characteristics of the member. Even though the current design procedures and existing literature have accounted for the effect of a slotted hole in the web of the cross-section, the patterned perforations in columns, which are more practical, would show a different effect from discrete holes. Hence, the research work has been focused on investigating the influence of different configurations of patterned perforations on the load-carrying capacity of the cold-formed steel lipped channel stub columns, which fails only after local buckling. The specimens were selected with trapezoidal perforations in the web with different spacings in lateral and longitudinal directions as well as varying web depth to flange width ratio and non-dimensional slenderness ratio. The numerical investigation was conducted using the finite element method with Abaqus software. The numerical results from the extensive parametric study were compared to the Direct Strength Method (DSM) design techniques.