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Ultimate load-carrying capacity of cold-formed thin-walled columns with built-up box and I section under axial compression
Abstract The use of cold-formed thin-walled steel structures has increased in recent years, and some built-up section members are motivated and also widely used for their excellent structural behaviors. In this paper, a series of axially-compressed tests on built-up box section members composed of two C-section by self-drilling screws at flanges are conducted. The differences of global, local and distortional buckling behaviors between members with built-up and single sections are investigated at first. Then the effects of installation error and fastener spacing on ultimate load-carrying capacity of built-up members are analyzed. A strength estimation method for built-up members under axial compression is proposed based on the experimental investigation in this paper, as well as some existing experiments, and corresponding numerical analysis studies. Finally, the predicted capacity obtained by using the proposed strength estimation method is compared with experimental results and the nominal axial strength determined according to the AISI provisions, by which the suitability and accuracy of the proposed strength estimation method have been established.
Highlights We conduct the experimental investigation on axially compressive capacity for high strength, built-up box section members with web stiffeners. We compare the structural behaviors difference, including global, local and distortional buckling, for axial compression members with single and built-up sections. Installation error׳s effect and connector spacing׳s effect on ultimate capacity are studied in this paper. A design method to determine the ultimate compression strength of built-up box and I section columns is proposed and verified.
Ultimate load-carrying capacity of cold-formed thin-walled columns with built-up box and I section under axial compression
Abstract The use of cold-formed thin-walled steel structures has increased in recent years, and some built-up section members are motivated and also widely used for their excellent structural behaviors. In this paper, a series of axially-compressed tests on built-up box section members composed of two C-section by self-drilling screws at flanges are conducted. The differences of global, local and distortional buckling behaviors between members with built-up and single sections are investigated at first. Then the effects of installation error and fastener spacing on ultimate load-carrying capacity of built-up members are analyzed. A strength estimation method for built-up members under axial compression is proposed based on the experimental investigation in this paper, as well as some existing experiments, and corresponding numerical analysis studies. Finally, the predicted capacity obtained by using the proposed strength estimation method is compared with experimental results and the nominal axial strength determined according to the AISI provisions, by which the suitability and accuracy of the proposed strength estimation method have been established.
Highlights We conduct the experimental investigation on axially compressive capacity for high strength, built-up box section members with web stiffeners. We compare the structural behaviors difference, including global, local and distortional buckling, for axial compression members with single and built-up sections. Installation error׳s effect and connector spacing׳s effect on ultimate capacity are studied in this paper. A design method to determine the ultimate compression strength of built-up box and I section columns is proposed and verified.
Ultimate load-carrying capacity of cold-formed thin-walled columns with built-up box and I section under axial compression
Li, Yuanqi (author) / Li, Yinglei (author) / Wang, Shukun (author) / Shen, Zuyan (author)
Thin-Walled Structures ; 79 ; 202-217
2014-02-03
16 pages
Article (Journal)
Electronic Resource
English
| British Library Conference Proceedings | 2014
Axial load capacity of cold-formed steel built-up stub columns
| Online Contents | 2017