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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 48
INNOVATION IN CIVIL AND STRUCTURAL ENGINEERING
Edited by: B.H.V. Topping and M.B. Leeming
Paper V.3

Optimum Shape Design of Cold Formed Thin Walled Steel Sections

S. Al-Mosawi and M.P. Saka

Civil Engineering Department, University of Bahrain, Bahrain

Full Bibliographic Reference for this paper
S. Al-Mosawi, M.P. Saka, "Optimum Shape Design of Cold Formed Thin Walled Steel Sections", in B.H.V. Topping, M.B. Leeming, (Editors), "Innovation in Civil and Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 215-228, 1997. doi:10.4203/ccp.48.5.3
Abstract
The algorithm presented in this study obtains the optimum cross-sectional dimensions of cold formed thin-walled steel beams subjected to general loading. It has the flexibility of considering different cross-sectional shapes such as symmetrical or unsymmetrical channel or lipped channel or Z sections. The algorithm treats the cross-sectional dimensions such as width, depth and wall thickness as design variables and considers the displacement as well as stress limitations. The presence of torsional moments causes warping of thin-walled sections. The effect of warping in the calculation of normal stresses is included using Vlasov theorems. These theorems require the computation of sectorial properties of cross-sections. A general numerical procedure is presented for obtaining these properties. The optimum design problem of thin walled open sections subjected to combined loading turns out to be highly nonlinear problem. It is shown that optimality criteria method can effectively be used to obtain its solution. Number of design examples are presented to demonstrate the application of the algorithm.

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