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有限要素法에 의한 軸對稱 回轉쉘의 應力解析 프로그램 開發에 관한 硏究
姜文明,金勝德,朴起弘 경북대학교 산업기술연구소 1994 産業技術硏究誌 Vol.22 No.-
Shell structures provide a very efficient structural shape because of their ability to support significant loads with a minimum material. The accurate stress-deformation analysis of reinforced concrete thin shells of revolution is very difficult usally. But it is almost impossible to calculate the exact solution because of the complexity of mechanics of shells. The purpose of this study is to devlope a computer program for stress-deformation analysis of thin shells of revolution. A numerical stress and deformation analysis of shell structures are performed by using FEM(Finite Element Method). For efficient use of computer's memory, user can easily change the array number of this program to save the memory at any time. And also this program have some subroutines so that user can add other subroutine which made by user instantly. So in this paper, stress, strain and displacement of shells will be approximated by using the curved shell element. As the result, it is shown that this numerical computer program nearly approximate to the exact solution.
Long-Term Performance of High Strength Concrete
강문명,최열 한국콘크리트학회 2004 콘크리트학회논문집 Vol.16 No.3
This paper describes an experimental investigation of how time-dependent deformations of high strength concretes are affected by maximum size of coarse aggregate, curing time, and relatively low sustained stress level. A set of high strength concrete mixes, mainly containing two different maximum sizes of coarse aggregate, have been used to investigate drying shrinkage and creep strain of high strength concrete for 7 and 28-day moist cured cylinder specimens. Based upon one-year experimental results, drying shrinkage of high strength concrete was significantly affected by the maximum size of coarse aggregate at early age, and become gradually decreased at late age. The larger the maximum size of coarse aggregate in high strength concrete shows the lower the creep strain. The prediction equations for drying shrinkage and creep coefficient were developed on the basis of the experimental results, and compared with existing prediction models.
建築物 外部 디자인에 關한 硏究 : 窓의 視覺的 效科를 中心으로 In the Center of Visual effectivenss of Window
姜文明,金正在 慶北大學校 1975 論文集 Vol.20 No.-
In the environment of the modern City, the external apearance of building is the most unavoidable element in forming environment of the urban roadside. The windowes together with the surface of wall are a great deal of the factor in formation of the outward show of building, and the question establishing windowes of building is to be such a very important part as the element of aesthetics design in connection with function. This is a major purpose of the paper. 1. The area of the research is Seoul City. 2. The windowes, towards, human by day and by night, through the four Seasons, and in every moment, forms such expression as if giving muted discussion. 3. The rythm due to the proportion of both wall and windowes afford the regulation and accuracy which should be able to find in the order for which the human excert themselves to create. 4. An adeguate variation of windowes in high-building, it should raise the municipal scene. 5. In a particular building, the shape of window should exercise the role of expressing the symbol of building.
球形 Shell에 對한 Hete´nyi近似解의 常數 K에 관한 硏究
姜文明 慶北大學校 1975 論文集 Vol.20 No.-
This paper obtained, instead of formulas(2) of Hete´nyi, the approximations(3) by the Series. The constants k, used in the stresses analysis of the spherical shells, are calculated very rapidly by the approximations(3). This paper has made the graphs about λ and the tables about k. A comparison of the approximations(3) with formulas(2) shows excellent agreement.
姜文明,朴文浩 慶北大學校 1978 論文集 Vol.25-26 No.-
Slab-Band floor have been primarily associated with apartment house construction. A numerical analysis of the stress for this system used simpson's rule, and this method was compared with solutions by the slope-deflection method. In the results of a comparison, it was found that results of simpson's rule was almost same as that of the slope-deflection method. This paper had seen that Slab-Band Floor system was more economical about 5%∼10% than two-way slab system.
極限强度設計法에 의한 Slab-Band Floor의 最適設計
姜文明 慶北大學校 1983 論文集 Vol.36 No.-
In this paper Slab-Band Floor for doubly reinforced concrete was analyzed by applying Ultimate Strength Design Method. And Slab-Band Floor was divided into column strip and middle strip. Thus each part was optimized by Lagrange's Multiplier method and differential calculus. In this paper objective function means cost function contained steel cost, concrete cost and form cost. Also design variables are steel ratio and effective thickeness of each portion. And constraint was considered by ultimate bending moment, minimum tickness for deflection and minimum steel ratio.
鐵筋콘크리트 構造에 대한 庶民아파트 骨組의 最適設計硏究
姜文明,金勝德 경북대학교 산업기술연구소 1994 産業技術硏究誌 Vol.22 No.-
This paper descrides on the optimum design of low-income apartment. The procedures of this study have the following steps : * For the structural analysis, the 15th storey frame systems were composed on the basis of a unit plan which is arranged with four household. * By ETABS-program, the bearing wall system and slab-band system were analyzed elastically. * The optimal problems were made by considering the objective function which minimize the construction cost of frame. * Constraints are the design limits defined by the ultimate flexural strength, the ultimate shear strength, the minimum thickness, and the minimun ratio of steel in accordance with ACI 318-89 Code. * Optimization is conducted by GINO ( General Interactive Optimizer) in case Utimate Strength Design (USD). * For the optimum Design of underground parking lots in the low-income apartment,the results of rahmen frame system were compared with those of slab-band system.