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Advances in Civil Engineering
Volume 2011, Article ID 932871, 24 pages
http://dx.doi.org/10.1155/2011/932871
Research Article

Multiobjective Design Optimization of Grillage Systems according to LRFD-AISC

High Vocational School of Kadirli, Osmaniye Korkut Ata University, 80000 Osmaniye, Turkey

Received 9 November 2010; Revised 18 May 2011; Accepted 29 May 2011

Academic Editor: Manolis Papadrakakis

Copyright © 2011 Tugrul Talaslioglu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Both the entire weight and joint displacements of grid structures are minimized at the same time in this study. Four multiobjective optimization algorithms, NSGAII, SPEAII, PESAII, and AbYSS are employed to perform computational procedures related to optimization processes. The design constraints related to serviceability and ultimate strength of grid structure are implemented from Load and Resistance Factor Design-American Institute of Steel Constructions (LRFD-AISC Ver.13). Hence, while the computational performances of these four optimization algorithms are compared using different combinations of optimizer-related parameters, the various strengths of grid members are also evaluated. For this purpose, multiobjective optimization algorithms (MOAs) employed are applied to the design optimization of three application examples and achieved to generate various optimal designations using different combinations of optimizer-related parameters. According to assessment of these optimal designations considering various quality indicators, IGD, HV, and spread, AbYSSS shows a better performance comparatively to the other three proposed MOAs, NSGAII, SPEAII, and PESAII.