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Discrete Optimum Design of Semi-rigid Steel Frames Using Refined Plastic Hinge Analysis and Genetic Algorithm  

Lee, Mal Suk (경북대학교 대학원 건축공학부)
Yun, Young Mook (경북대학교 토목공학과)
Kang, Moon Myoung (경북대학교 건축공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.16, no.2, 2004 , pp. 201-213 More about this Journal
Abstract
A GA-based optimum design algorithm and a program for plane steel frame structures with semi-rigid connections are presented. The algorithm is incorporated with the refined plastic hinge analysis method wherein geometric nonlinearity is considered by using the stability functions of beam-column members, and material nonlinearity, by using the gradual stiffness degradation model that includes the effects of residual stresses, moment redistribution through the occurrence of plastic hinges, semi-rigid connections, and geometric imperfection of members. In the genetic algorithm, the tournament selection method and micro-GAs are employed. The fitness function for the genetic algorithm is expressed as an unconstrained function composed of objective and penalty functions. The objective and penalty functions are expressed as the weight of steel frames and the constraint functions, respectively. In particular, the constraint functions fulfill the requirements of load-carrying capacity, serviceability, ductility, and construction workability. To verify the appropriateness of the present method, the optimal design results of two plane steel frames with rigid and semi-rigid connections are compared.
Keywords
refined plastic hinge analysis; genetic algorithm; optimum design; semi-rigid steel frame;
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