Abstract
A structural arrangement of a portal frame that is easy to fabricate and assemble is developed. The rafter and column members are formed from single cold-formed channel sections, which are bolted, back-to-back at the eaves and apex joints, and connected to the foundation through angle irons. Variables in the frames include the span, width of the channel flanges and the strength of the channels. The design of the frame members follows the traditional approach of applying the effective width method to control local buckling, followed by an assessment of cross-sectional and buckling requirements. However, the yield and overall buckling requirements are modified by a factor of 0.8 to account for stress concentrations, shear lag and bearing deformations in the connections. All deflections of the frames considered are found to be within the limits provided in the literature and by the two codes of practice. It is proposed that the frames of the structure should be provided in a kit form and erected in “meccano” fashion
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References
AS4100 (1990). Steel Structures. Standards Australia.
CAN/CSA-S16-01 (2001). Steel structures for buildings-Limit states design. Canadian Standards Association, Rexdale.
De Clercq, H. (1991). “Mini-Factories-Providing Accommodation for Entrepreneurs.” Conference on Trends in Steel Structures for Mining and Building, Southern Africa Institution of Steel Construction.
Dundu, M. and Kemp, A. R. (2006a) “Strength requirements of single cold-formed channels connected back-to-back.” Journal of Construction Steel Research, 62, pp. 250–261.
Dundu, M. and Kemp, A. R. (2006b) “Plastic and flexural behaviour of single cold-formed channels connected back-to-back.” Journal of Structural Engineering, ASCE, 132(8), pp. 1223–1233.
Dundu, M. and Kemp, A. R. (2008) “Column-angle cleat base connections.” 5th International Conference on Thin-Walled Structures, pp. 593–598.
Dundu, M. and Maphosa, S. (2010) “Angle cleat base connections.” 20 th International Specialty Conference on Cold-Formed Steel Structures.
Eurocode 3 (1996). Design of Steel Structures: Part 1.1-General Rules and Rules for Buildings. Brussels.
Kemp, A. R. (2001) “Bearing capacities and modes of failure in single-bolt lap joints.” Journal of the South African Institution of Civil Engineering, 43(1), pp. 13–18.
Lim, J. B. P. (2001). Joint effects in cold-formed steel portal frames. PhD Thesis, School of Civil Engineering, University of Nottingham.
SANS 0162-1 (2005). South Africa Standard Code of Practice for the Structural use of Steel, Part 1-Limit States Design of Hot-rolled Steelwork. South African Bureau of Standards, Pretoria.
SANS 10162-2 (2005). South Africa standard code of practice for the structural use of steel, Part 2-Limit states design of cold-formed steelwork. South African Bureau of Standards, Pretoria.
SANS 10160 (1989). South Africa standard code of practice for the general procedures and loadings to be adopted in the design of buildings. South African Bureau of Standards, Pretoria.
SAISC 10162-2 (2005). Southern African Steel Construction Handbook. Southern African Institute of Steel Construction.
SCI Advisory Desk (1991). Deflection Limits for Pitched Roof Portal Frames. Steel Construction Today, Steel Construction Institute, pp. 203.
Woolcock, S. T. and Kitipornchai, S. (1986). “Portal frame deflections.” Journal of Australian Institute of Steel Construction, 20(3), pp. 2–10.
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Dundu, M. Design approach of cold-formed steel portal frames. Int J Steel Struct 11, 259–273 (2011). https://doi.org/10.1007/s13296-011-3002-2
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DOI: https://doi.org/10.1007/s13296-011-3002-2