Computational & Technology Resources
an online resource for computational,
engineering & technology publications
PROCEEDINGS OF THE FOURTH INTERNATIONAL CONFERENCE ON CIVIL AND STRUCTURAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Optimum Design of Steel Frames with Stability Constraints
Department of Civil Engineering, University of Bahrain, Bahrain
M.P. Saka, "Optimum Design of Steel Frames with Stability Constraints", in B.H.V. Topping, (Editor), "Proceedings of the Fourth International Conference on Civil and Structural Engineering Computing", Civil-Comp Press, Edinburgh, UK, pp 141-155, 1989. doi:10.4203/ccp.9.16.3
Optimum design algorithms based on the optimality criteria approach are proven to be efficient and general. They have the flexibility of accommodating variety of design constraints such as displacement, stress, stability and frequency in the design problem. Yet. The design methods developed recently, although considers one or more of these constraints lack the necessity of referring to any relevant design code. The algorithm presented for the optimum design of steel frames implements the displacement and combined stress limitations according to AISC. The recursive relationship for design variables in the case of dominant displacement constraints is obtained by the optimality criteria approach. The combined stress inequalities which include in-plane and lateral buckling of members are reduced into nonlinear equations of design variables. The solution of these equations gives the values of bounds for the variables in the case where the stress constraints are dominant in the design problem. The use of effective length in the combined stress constraints makes it possible to study the effect of the end rigidities on the final designs.
The design procedure is simple and easy to program which makes it particulary suitable for microcomputers. Number of design examples are considered to demonstrate the practical applicability of the method. It is also shown that the design procedure can be employed in selecting the optimum topology of steel frames.
purchase the full-text of this paper (price £20)