Design Approach of Cold-formed Steel Portal Frames

다국어 초록 (Multilingual 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

참고문헌 (Reference)

1 Dundu, M, "Strength requirements of single cold-formed channels connected back-to-back" 62 : 250-261, 2006

2 "Steel structures for buildings- Limit states design"

3 "Steel Structures"

4 "Southern African Steel Construction Handbook"

5 "South Africa standard code of practice for the structural use of steel, Part 2-Limit states design of cold-formed steelwork"

6 "South Africa standard code of practice for the general procedures and loadings to be adopted in the design of buildings"

7 "South Africa Standard Code of Practice for the Structural use of Steel, Part 1-Limit States Design of Hot-rolled Steelwork"

8 Woolcock, S. T, "Portal frame deflections" 20 (20): 2-10, 1986

9 Dundu, M, "Plastic and flexural behaviour of single cold-formed channels connected back-to-back" ASCE 132 (132): 1223-1233, 2006

10 De Clercq, H, "Mini-Factories-Providing Accommodation for Entrepreneurs" Southern Africa Institution of Steel Construction 1991

11 Lim,J.B.P, "Joint effects in cold-formed steel portal frames" University of Nottingham 2001

12 "Design of Steel Structures: Part 1.1- General Rules and Rules for Buildings"

13 SCI Advisory Desk, "Deflection Limits for Pitched Roof Portal Frames" Steel Construction Institute 203-, 1991

14 Dundu, M, "Column-angle cleat base connections" 593-598, 2008

15 Kemp, A. R, "Bearing capacities and modes of failure in single-bolt lap joints" 43 (43): 13-18, 2001

16 Dundu, M, "Angle cleat base connections" 2010