KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Optimum Design of Plane Steel Frames Using Second-Order Inelastic Analysis and a Genetic Algorithm

2차 비탄성해석과 유전자 알고리듬을 이용한 평면 강골조 구조물의 최적설계

Yun, Young-Mook;Kim, Byung-Hun
윤영묵;김병헌

  • Published : 2004.01.31

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Abstract

A GA-based optimum design algorithm incorporated with a second-order inelastic analysis method are presented. In the second-order inelastic analysis method, the geometric nonlinearity is considered by using the stability functions of beam-column members, and the material nonlinearity is considered by using the gradual stiffness degradation model that includes the effects of residual stresses, moment redistribution by the occurrence of plastic hinges, and geometric imperfections of members. In the genetic algorithm, tournament selection method and micro-GAs are employed. The objective function is expressed as the total weight of steel frames. The requirements of load-carrying capacity, serviceability, ductility, and construction workability are used as the constraint conditions. The appropriateness of the proposed method is verified by conducting the optimum design of several plane steel frames.

본 논문에서는 2차 비탄성해석과 유전자 알고리듬을 이용한 평면 강골조 구조물의 이산최적설계 방법을 제시하였다. 2차 비탄성해석에서는 강골조 구조물의 기하학적 비선형성을 고려하기 위해 보-기둥 요소의 안정함수를 사용하였으며, 재료적 비선형을 고려하기 위해 잔류응력, 소성힌지, 그리고 기하학적 불완전성 등에 의한 점진적인 강성감소모델을 사용하였다. 유전자 알고리듬에서는 토너먼트 선택방법과 마이크로 유전자 알고리즘을 사용하였다. 목적함수로는 구조물의 총중량을 사용하였으며, 제약조건으로는 하중-저항능력, 사용성, 연성도, 그리고 시공성에 관한 기준을 고려하였다. 여러 평면 강골조 구조물의 최적설계를 수행하여 본 연구에서 제시한 방법의 적합성을 검증하였다.

Keywords

References

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