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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 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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