Abstract
Abstract The article presents comparative analyzes aimed at determining the optimal cross-section used in cold-formed steel purlins. The geometrical characteristics, bending resistance and self-weight of channel, zeta and hat cross-sections were compared. The calculations were made using Dlubal SHAPE-THIN software for the bending by the main axis y-y and z-z. The characteristics for the gross and effective cross-section were determined. Based on the first stage analyzes, a significant decrease in cross-sectional bending resistant was observed as a result of a local buckling. The solution to this problem may be the use of intermediate stiffeners. In the second stage, analysis of the impact of the intermediate stiffeners’ locations on the characteristics of hat sections were conducted. Additional intermediate stiffeners on the webs, on the upper chord, and on the webs and upper chord (together) were considered. A significant effect on the bending resistant with a small increase in the element’s self-weight has been demonstrated. In the third stage, the characteristics of a channel, zeta and hat profile with intermediate longitudinal stiffener in the middle of the web were compared. The performed analyzes demonstrated that the hat cross-section shows a significant advantage in bending by the main axis z-z. This advantage can be used in case of lack of protection against lateral torsional buckling and a larger degree of roof slope.
Highlights
The article presents comparative analyzes aimed at determining the optimal cross-section used in coldformed steel purlins
The performed analyzes demonstrated that the hat crosssection shows a significant advantage in bending by the main axis z-z
In classical solutions they are made of hot-rolled sections (IPE) but recent developments in the field of construction aims at decrease self-weight of members by the using the cold-formed section, which are described in [1,2,3] and [4] or [5]
Summary
Abstract: The article presents comparative analyzes aimed at determining the optimal cross-section used in coldformed steel purlins. In typical structure of steel single story industrial building purlins are usually members in roof structure used as a support of the roof decking or sheeting In classical solutions they are made of hot-rolled sections (IPE) but recent developments in the field of construction aims at decrease self-weight of members by the using the cold-formed section (zeta section, channel section), which are described in [1,2,3] and [4] or [5]. Members with slender cross-section plates in bending and axial compression are prone to local buckling, which must be considered in calculating of effective section properties These characteristics are determined according to [6]. The calculations were carried out according to the following scheme:
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