earticle

영어

Usually there are a lot of uncertainties about the error of assumed load, material properties, member size and structure analysis in structure, and then directly it may have an influence on qualities of optimal design of structures. Probabilistic analysis is rapidly developing into a desirable processes and structural reliability analysis is an increasingly important tool that assists engineers to consider uncertainties during the design, construction and life a structure in order to calculate its probability of failure. Incorporating probabilistic with optimization of structures is a step towards improving many current deterministic design systems. After recognizing the uncertainty in the parameters such as material, loading, geometry and so on in contrast with the conventional optimization, the optimization concept considering structural uncertainties has become more meaningful to perform an economical design implementation, which includes a reliability analysis and an optimization algorithm. A demonstration of an example Beam-to-column connections under reliability constraints. Connections are very important in steel structure buildings, and have direct effect on safety and economic efficiency of the buildings. Especially, they have rigidity and ductility that are necessary for behavior and stress transmission of buildings. And it also needed for them to carry the ability of strength and strain with easy construction. This paper deals with applications of two optimization techniques it solve reliability based optimization problem of structures. The reliability based optimization problem is formulated as minimization of structural volume subject to the constraints on the values of componential reliability index determined by AFOSM approach. This presented method may be useful tool for the reliability-based design optimization of structures.

한국어

본 연구에서는 구조물 응답의 불확실성을 발생시키는 여러 요인들 중에서 수치적으로 정량화에 적합한 구조매개 변수와 하중조건에 의한 불확실성으로 국한하여 연구를 수행한다. 불확실성을 고려하는 방법으로 확률통계적인 사항을 고려한 신뢰도지수와 파괴확률을 계산한다. 여기서 계산된 신뢰도지수를 최적설계 문제에 적용하는데 적용방법으로는 최적화 과정 중 제약조건식으로 적용하여 구조물의 최적설계를 실시하여 수렴횟수, 최소비용을 산출하였다. 본 연구에서 개발한 프로그램을 검증하기 위한 해석 모델로는 불확실량이 가장 많이 내재된 부재 중 하나인 보-기둥 접합부를 설정하였고 확률·통계 및 최적화 이론에 필요한 함수를 내장하고 있고 미·적분이 용이한 Matlab 프로그램을 이용하여 프로그램을 개발하였다.