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김승덕,이신우,Kim, Seung-Deog,Lee, Shin-Woo 한국공간구조학회 2010 한국공간구조학회지 Vol.10 No.2
막 구조물의 비선형 문제는 많은 연구자들에 의해 연구가 있었고 현재 또한 많은 연구가 이루어지고 있다. 막 구조물은 해석방법에 따라 그 수렴성이 민감하게 반응하기 때문이다. 이러한 비선형 문제는 매우 복잡하고 정교한 연구가 수반되어야 하며 고도의 기술을 필요로 하기 때문에 해석방법에 대한 접근이 초기형상결정단계부터 어려운 실정이다. 따라서 본 논문에서는 해석할 때에 발생하는 해의 발산과 면재의 쏠림 현상에 대한 해결책으로 막 구조물 설계 시에 많이 사용되는 삼각형 평면요소에 대해서 선재로 치환하여 해석하는 방법을 제안하고, 카테나리 예제를 대상으로 해석을 수행하여 해의 수렴성 및 신뢰도를 고찰한다. Nonlinear problems for membrane structures are very sensitive in convergence procedure in nonlinear iterations. Therefore many researchers have suggested a lot of ideas in published papers. In this study, authors are trying to get easier solution for taking membrane shape by initial stresses from substitution of the membrane to line elements. To obtain nonlinear stiffness, the nonlinear finite element method is used for both membrane and cable elements, and only geometric nonlinear terms are taken for shape analysis. By some examined models, we can find that the substituted models show better results to get, initial shape in which the concentrating phenomenon is removed at edge parts.
스텝하중을 받는 얕은 정현형 아치의 연속 응답 스펙트럼에 의한 동적 좌굴 특성 분석
김승덕,윤태영,손수덕(KIm Seung-Deog),Yun Tae-Young,Shon Su-Deok 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.10
Many researches have been performed for investigating dynamic instability of shell-like structures under STEP excitations, but most of them do not deal with the essential phenomenon of dynamic buckling by phase plane to investigate for occurrence of chaos. Dynamic buckling process in a phase plane is very important issue for understanding why unstable phenomena are sensitively originated in nonlinear dynamic by various initial conditions.<br/> Fundamental mechanisms of the dynamic instability are studied when the sinusoidally shaped arch structures are subjected to sinusoidally distributed excitations with pin-ends. Especially the mechanisms of dynamic indirect snapping of shallow arches are investigated under STEP function excitations. The dynamic nonlinear responses are obtained by the numerical integration of the geometrically nonlinear equation of motion.<br/> Finally, nonlinear displacement responses are obtained using Newmark - β method and the characteristics of dynamic instability are analyzed through the running response spectrum by FFT(Fast Fourier Transform)
김승덕,주석범,장명호,이정현,Kim, Seung-Deog,Chu, Seok-Beom,Jang, Myung-Ho,Lee, Jeong-Hyun 한국공간구조학회 2017 한국공간구조학회지 Vol.17 No.4
In this paper, uniaxial tensile tests of ETFE films with three kinds of thicknesses(100, 200, $250{\mu}m$) and two kinds of directions(machine direction & transverse direction) are performed and the tensile strength, the tensile strain at break and the Young's modulus of ETFE films are compared for two kinds of specimen types(2 & 5). It could be figured out that there are no significant difference between tensile strengths of two specimen types but the tensile strain at break and the Young's modulus of ETFE films are affected by the specimen types. And it is concluded that the uniaxial tensile test of specimen type 2 are more reliable than that of specimen type 5.
Hybrid 구조물의 비선형 불안정 거동에 관한 연구(I) -초기형상 불완전에 의한 정적 면내비틀림 좌굴 특성-
김승덕,손수덕,김형석,강문명,Kim, Seung Deog,Son, Su Deok,Kim, Hyung Seok,Kang, Moon Myung 한국강구조학회 2001 韓國鋼構造學會 論文集 Vol.13 No.5
연속체 쉘을 이산화한 구조시스템은 돔형 구조물을 만들기 위해 많이 이용되고 있으며, 이러한 구조물은 하중레벨이 어느 임계값에 도달하면 구조물의 형상에 따라 뜀좌굴(snap-through) 또는 분기좌굴(bifurcation)에 의한 불안정 현상이 일어난다. 케이블 돔의 구조거동 특성은 초기장력 및 외력에 다라 비선형성이 강하게 나타나며 또한 초기조건에 매우 민감하게 반응한다. 본 연구에서는 케이블 돔의 불안정 문제를 파악하기 위해 Geiger 모델을 대상으로 하여 초기 장력도입에 의한 형상결정 문제를 다루고 이를 이용하여 완전형상 및 초기형상 불완전을 도입하여 외력에 의한 불안전성현상을 규명한다. The structural system that discreterized continuous shells is frequently used to make dome-type structures and these structures show the unstable phenomena by snap-through or bifurcation when a load level reaches certain critical value. The characteristic structural behaviour of a cable dome shows a strong nonlinearity and very sensitive according to the initial imperfection. In this study the shape finding problem by applying initial tension stress is investigated and using this the unstable phenomena of perfectly shaped and initially imperfected shape model by external forces are examined to grasp the unstable behavior of cable dome using the Geiger-type model.
김승덕,권숙준,Kim, Seung-Deog,Kwon, Suk-Jun 한국공간구조학회 2010 한국공간구조학회지 Vol.10 No.4
복합적층판은 다른 금속재료에 비해 높은 비강도, 비강성 등의 우수한 역학적 특성을 지니므로, 최근 다양한 분야에서 사용하고 있다. 그러나 이러한 복합적층판은 충격에 약하다는 단점이 있다. 그리하여 복합적층판의 충격거동에 대한 많은 연구가 이루어지고 있다. 충격거동을 조사하기 위해서는 우선 충격체와 복합적층판사이의 접촉력을 계산하여야 한다. 접촉력을 알기 위해서는 운동방정식, 복합적층판의 운동방정식 그리고 압입량에 관한 관계식을 동시에 풀어야 한다. 본 연구에서는 고전적인 헤르츠식, 썬식, 썬&양식 그리고 썬&탄식을 포함한 유한요소프로그램을 이용하여 복합적층판의 저속충격거동을 조사한다. Laminated composite plates have shown their superiority over metals in applications requiring high specific strength, high specific modulus, and so on. Therefore, they have used in various industry. However, they have poor resistance to impact compared to typical metal materials. So, many researchers have investigated about impact behavior of laminated composite plate. To investigate impact behavior of laminated composite plate, we have to calculate contact force between impactor and laminated composite plate at the first. Impactor's equation of motion, plate's equation of motion and correlations for indentation were solved to know the contact force at the same time. In this study, low velocity impact behavior of composite plate was investigated using the finite element program which is involved the classical Hertzian law, Sun's law and Sun & Yang's experimental law and Sun & Tan's experimental law considering the stacking method.
ETFE 필름의 2축 인장특성 및 텐션방식 막구조물의 응력완화 거동에 관한 실험적 연구
김승덕,정을석,카와바타 마사야,Kim, Seung-Deog,Jeong, Eul-Seok,Kawabata, Masaya 한국공간구조학회 2016 한국공간구조학회지 Vol.16 No.1
Until recently, almost all ETFE film structures that have been erected is the cushion type because there are problems at lower allowable strength under elastic range and viscosity behaviour such as creep and relaxation of ETFE films under long-term stresses. But the number of tension type structures is currently increasing. This paper proposes the stretch fabrication of ETFE film to verify the applicability of ETFE films to tensile membrane structures. First of all, to investigate the possibility of application on tensile membrane structures, the stretch fabrication test is carried out, and it is verified that it is possible to increase the yield strength of the film membrane structures. After simulating the experiment also carries out an analytical investigation, and the effectiveness of the elasto-plastic analysis considering the viscous behavior of the film is investigated. Finally, post-aging tension measurement is conducted at the experimental facilities, and the viscosity behavior resulting from relaxation is investigated with respect to tensile membrane structures.
김승덕,이경수,Kim, Seung-Deog,Lee, Kyoung-Su 한국공간구조학회 2016 한국공간구조학회지 Vol.16 No.4
This paper is a study on Development of polyhedral surfaces Quasicrystal System. Quasicrystal is the quasi-crystalline material, which is the intermediate material of the crystalline material and non-crystalline material. Quasicrystal is a structures that is ordered but not periodic, the basic form is a rhombus. These studies in the field of chemistry will proceed actively studied, in the field of construction a situation that still insufficient research. Therefore, in this paper, we presents the analysis of Quasicrystal system, and the research on the applicability of as dome structures. This paper described some examples of polyhedron form, and method of applying Quasicrystal system.