Local buckling studies of cold-formed steel compression members at elevated temperatures

Load tests were carried out on 36 stub column samples of cold-formed steel studs having 38.1 mm wide × 44.5 mm long holes punched through their webs, steel thicknesses of 1.21–2.01 mm, and overall section depths of 63–204 mm. Based on these tests a best-fit equation for the effective width of the unstiffened portion of the web beside the holes has been developed. Suggested design equations have been proposed. The test results support the present equation for the average yield stress [Formula: see text] in Canadian Standards Association Standard S136-1974 but the present code equations for unstiffened plates are unduly conservative when applied to the design of the web adjacent to openings of the size considered.

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Compression Test on Cold-Formed Steel Built-Up Back-to-Back Channels Stub Columns

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.201-203.2900 ◽

2011 ◽

Vol 201-203 ◽

pp. 2900-2903 ◽

Cited By ~ 5

Author(s):

Chui Huon Tina Ting ◽

Hieng Ho Lau

Keyword(s):

Compression Test ◽

Failure Modes ◽

Local Buckling ◽

Effective Width ◽

Test Results ◽

Direct Strength Method ◽

Cold Formed Steel ◽

Stub Column ◽

Hot Rolled ◽

Stub Columns

Built-up sections are used to resist load induced in a structure when a single section is not sufficient to carry the design load for example roof trusses. In current North American Specification, the provision has been substantially taken from research in hot-rolled built-up members connected with bolts or welds [1]. The aim of this paper is to investigate on built-up back-to-back channels stub columns experimentally and theoretically using Effective Width Method and Direct Strength Method. Compression test was performed on 5 lipped channel and 5 back-to-back channels stub columns fabricated from cold-formed steel sheets of 1.2mm thicknesses. The test results indicated that local buckling is the dominant failure modes of stub columns. Therefore, Effective Width Method predicts the capacity of stub columns compared to Direct Strength Method. When compared to the average test results, results based on EWM are 5% higher while results based on DSM are 12% higher for stub column.

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Experimental Study on Mechanical Behavior of Cold-Formed Steel Three Limbs Built-up Section Members

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.163-167.651 ◽

2010 ◽

Vol 163-167 ◽

pp. 651-654

Author(s):

Tian Hua Zhou ◽

Shao Feng Nie ◽

Xiang Bin Liu ◽

Guang Yi Li

Keyword(s):

Experimental Study ◽

Mechanical Behavior ◽

Axial Compression ◽

Local Buckling ◽

Distortional Buckling ◽

Torsional Buckling ◽

Failure Characteristics ◽

Compression Load ◽

Cold Formed Steel ◽

Flexural Torsional Buckling

18 specimens of cold-formed steel three limbs built-up section members are tested under axial compression load in this paper. The section forms are divided into two categories: A and B. Load-displacement (P-Δ) curves and failure characteristics of specimens are obtained. The results show that: As to section A members, the failure characteristics of LC, MC and SC series of specimens are flexural-torsional buckling, torsional buckling and distortional buckling, local buckling and distortional buckling. As to section B members, the failure characteristics of LC, MC series of specimens are flexural buckling, while local buckling and distortional buckling for members of SC series.

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