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

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 201-203)
• Pages: 2900-2903
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.201-203.2900
• Online since: February 2011
• Authors: Chui Huon Tina Ting, Hieng Ho Lau
• Keywords: Back-to-Back Channels, Cold-Formed Steel, Compression, Stub Column

References

[1] NAS: AISI Manual – Cold-formed Steel Design, American Iron and Steel Institute, Washington DC (2002).

[2] B. Young, and K.J.R. Rasmussen: Research Report No. R715 Compression Tests of Fixed-ended and Pin-ended Cold-formed Lipped Channels. Centre for Advanced Structural Engineering, School of Civil and Mining Engineering, The University of Sydney, Australia (2003).

[3] AS/NZS 1391: Methods of Tensile Testing of Metals, Australian Standard/ New Zealand Standards: 1391: 1991, Standards Australia, Australia (1991).

[4] NAS: North American Specification for the Design of Cold-formed Steel Structural Members, American Iron and Steel Institute, Washington DC (2001).

[5] AS/NZS 4600: Cold-formed Steel Structures, Australian Standard/New Zealand Standards: 4600: 1998, Standards Australia, Sydney, Australia (1998).

[6] NAS: Direct Strength Method (DSM) Design Guide, American Iron and Steel Institute (2006).