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PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Optimum Design of RC Columns According to Effective Length Factor in Buckling
S.M. Nigdeli and G. Bekdas
Department of Civil Engineering, Istanbul University, Avcilar, Istanbul, Turkey
S.M. Nigdeli, G. Bekdas, "Optimum Design of RC Columns According to Effective Length Factor in Buckling", in , (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 231, 2014. doi:10.4203/ccp.106.231
Keywords: reinforced concrete, slenderness, columns, optimization, metaheuristic methods, harmony search..
In this paper, an optimum design methodology is proposed for slender reinforcedconcrete (RC) columns by employing harmony search (HS). In slender RC columns, second order effects must be taken into account. ACI 318 demonstrates a simplified method for slender columns. In this method, the flexural moment of the column is multiplied with a moment magnification factor. As an optimization application, this study investigates optimum design for different effective length factors in buckling. This factor is varied between 0.5 (the element with fixed support at both ends) and 2.0 (the element with fixed support at bottom and free at upper end) increments of 0.1. The method is shown to be successful in finding the optimum design with minimum cost and slenderness of the columns are effective if the effective length factor in buckling exceeds a value.
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