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손수덕(Shon, Su-Deok),유미나(Yoo, Mi-Na),이승재(Lee, Seung-Jae) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.10
This paper investigates minimum weight structural design of sinusoidal corrugated web girder and characteristics of optimum cross-section in accordance with structural design codes. To do an optimum design, we consider objective function as minimum weight of the girder, use the constraint functions as slenderness ratio, stress and the girder deflection, and adopt the design variables concerning cross-section of the girder. We also choose EN 1993-1-5 and DASt-R015 to compare shear design codes of sinusoidal corrugated web. With this, we adopt a simply supported girder as mathematical model, and carry out genetic algorithm simulation to investigate the characteristics of minimum weight and cross-section of the girder. The result of the investigation shows that optimum cross-section area of EN 1993-1-5 is smaller than that of DASt-R015 and can be designed in more slenderness. A yield strength increase brings the decrease in the optimum cross-section area in the simple beams under concentrated load and uniform load. The minimum weight design of sinusoidal corrugated web shows a tendency to increase design variables with load increase. Besides, corrugated web thickness shows a tendency of stable increase regardless the yielding strength of corrugated web girder, and shows a similarity in the increase of optimal cross-section area.
멀티스테이지 호모토피 섭동법을 이용한 얕은 정현형 아치의 근사-해석적 해
손수덕(Shon, Su-Deok),이승재(Lee, Seung-Jae) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.4
The purpose of this study is to investigate the applicability of multistage homotopy perturbation method (MHPM) to shallow sinusoidal arches in order to obtain a semi-analytical solution. For this research purpose, a nonlinear governing equation of the arches was formulated and a homotopy equation was derived using the formulated differential equation. The result of a dynamic analysis on a symmetric mode and an asymmetric one was compared with the classical homotopy perturbation method and the 4<SUP>th</SUP> order Runge-Kutta method. From the comparison results, it was found that the dynamic response by MHPM concurred with the numerical results. Besides, the pattern of the response and the attractor by semi-analytical solution could delineate the dynamic snapping of the arches under excitations, and the attraction of the model in consideration of damping reflected the convergence and asymptotic stability well.
트러스 구조물의 최소중량설계를 위한 양자기반 화음탐색 알고리즘의 개발
손수덕(Shon, Su-Deok),이승재(Lee, Seung-Jae) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.10
With the development of quantum computer, the quantum-inspired search method applying the features of quantum mechanics, i.e. indetermination, superposition, entanglement, etc, and its application to engineering-problems have emerged as one of the most interesting research topics. Unlike the study of the quantum computer, the quantum-inspired search algorithms have been developed based on the application of the existed meta-heuristic algorithm and the information superimposed quantum-bit approached via through quantum gate. In this process, it appears that the balance between the two features of exploration and exploitation, and continually accumulates evolutionary information. Thus, this study is to propose a quantum-inspired harmony search algorithm and to solve the structural optimization problem by the algorithm. For the optimization, we suggest the mathematical modeling of the truss which is possible to minimum weight design. In its model, the cost function is minimum weight and constraint function consists of the stress. To trace the accumulative and convergence process of evolutionary information, 3-bar and 10-bar truss are chosen as the numerical examples, and their results are analyzed. The optimized design result in the numerical examples shows it has better result in minimum weight design, compared to those of the other search methods. It is also observed that more accurate optional values can be acquired as the result by accumulating evolutionary information.