고유치문제로 정식화된 텐세그러티 구조물의 형상탐색

정미루,이재홍,Jung, Mi-Roo,Lee, Jae-Hong 한국공간구조학회 2010 한국공간구조학회지 Vol.10 No.2

본 논문은 고유치문제로 정식화된 텐세그러티 구조물의 형상탐색에 대하여 제시하고자 한다. 텐세그러티 구조물의 안정을 위해서는 형상탐색을 수행하여야한다. 형상탐색을 위한 해석 방법은 내력밀도법과 일반역행렬을 이용한 방법, 이 두 가지가 널리 알려져 있다. 본 연구는 새롭게 형상을 탐색하는 방법을 제시하여 텐세그러티 구조물의 자기평형 응력을 얻었다. 제시한 방법은 기존의 방법을 기본으로 한 모든 절점의 평형 방정식을 고유치 문제로 정식화하였다. 이를 증명하기 위해 몇 가지 예제(텐세그러티 구조물)를 기존의 방법과 비교 하였다. 본 연구에서 제시된 방법은 기존의 방법과 같은 결과가 나왔으며, 나아가 해답을 얻는 과정이 훨씬 간단하였다. Form-Finding of tensegrity structures by eigenvalue problem is presented, In ardor to maintain the structures stable, "Form-Finding" should be performed. The types of analytical methods are known to solve this phenomenon: One is to use force density method, and the other is to apply so called, generalized inverse method. In this paper, new form finding methods are presented to obtain the self-equilibrium stress of the tensegrity structures. This method is based on the equilibrium equation of the all of the joint and the governing equation is formulated as eigonvalue problem. In order to verify this approach, numerical example(tensegrity structures) are compared with others calculated by previous methods. The solution by present method is shown identical results. Furthermore, the developed process to find the results is more efficient than previous approaches.

장려상-초고층건물

정미루,김병훈,안진영,Jeong, Mi-Ru,Kim, Byeong-Hun,An, Jin-Yeong 한국건축구조기술사회 2007 건축구조 Vol.14 No.3

초고층 전단벽-메가컬럼 아웃리거 구조시스템의 비선형 해석

정미루(Jung Mi-Roo),김연태(Kim Yeon-Tae),이재홍(Lee Jaehong),이기학(Lee Kihak),안남식(Ahn Nam-Shik) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)

In this paper, the behavior of shear wall-frame systems is analyzed. the governing equations of the wall-frame systems with outrigger truss are formulated through the continuum approach and the whole structure is idealized as a sheart-flexural cantileverwith rotation spring. The effect of shear deformation and flexural deformation of the wall-frame and outrigger trusses are considered and incorporated in the formulation of the governing equations. Nonlinear analysis of the wall-frame structures with and without ouriggers are compared by using finite element analysis incorporated with Newton-raphson method. Pilot project model, which is constructed shear wall-mega column system is compared with the finite element package MIDAS. The proposed method is found to be simple and efficient, provides reasonably accurate results in early design stage of tall building structures.

고유치해석을 이용한 케이블 돔 구조물의 자기평형 응력 모드 해석

정미루(Jung Mi-Roo),이재홍(Lee Jae-Hong) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4

Self-equilibrium stress mode analysis of cable dome structures by eigenvalue analysis is presented, In order to maintain the structures stable, "state of self-equilibrium stress" should be introduced. The types of analytical methods are known to solve this phenomenon: One is to use force density method, and the other is to apply so called, generalized inverse method. In this paper, new form finding method is presented to obtain the self-equilibrium stress of the cable dome structures. This method is based on the equilibrium equation of the all of the joint and the governing equation is formulated as eigenvalue problem. In order to verify this approach, numerical examples(2,3-dimensional cable dome structure, tensegrity, tridimensional octahedral structure) are compared with others calculated by generalized inverse method. The solution by present method is shown identical results. Furthermore, the developed process to find the results is also simpler than previous solution.

고유치문제로 정식화된 멀티 스테이지 텐세그러티 구조물의 자기평형 응력 모드 해석

정미루(Jung Mi-Roo),이수현(Lee Su-Hyun),이재홍(Lee Jae-Hong) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)

Self-equilibrium stress mode analysis of multi-stage tensegrity structures by eigenvalue problem is presented, In order to maintain the structures stable, "state of self-equilibrium stress" should be introduced. The types of analytical methods are known to solve this phenomenon: One is to use force density method, and the other is to apply so called, generalized inverse method. In this paper, new form finding methods are presented to obtain the self-equilibrium stress of the tensegrity structures. These methods are based on the equilibrium equation of the all of the joint and the governing equation is formulated as eigenvalue problem. In order to verify this approach, multi-stage tensegrity structures based on results of unit module are compared with others calculated by previous methods. The solution by present method is shown identical results. Furthermore, the developed process to find the results is more efficient than previous approaches.

건축용 막재의 인장강도 시험을 근거로 한 이중막 구조의 압력실험

정미루(Jung, Mi-Roo),백기열(Baek, Ki-Youl),김종수(Kim, Jong-Soo),고광웅(Ko, Kwang-Woong) 대한건축학회 2010 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.30 No.1(구조계)

복합재료 패널로 보강된 철근 콘크리트 보의 휨 실험

김진만,정미루,이재홍,윤광섭,Kim, Jin-Man,Jung, Mi-Roo,Lee, Jae-Hong,Yoon, Kwang-Sup 한국공간구조학회 2010 한국공간구조학회지 Vol.10 No.2

본 논문은 복합재료 패널로 보강된 철근 콘크리트 보의 휨 실험과 해석을 통하여 패널의 보강효과에 대하여 알아보고자 한다. FRP 복합재료 패널은 전통적인 재료인 강재와 콘크리트에 비해 단위 무게당 강도 및 강성이 크고 부식에 대한 높은 저항성, 절연성, 고내구성 및 낮은 열전도성 등 우수한 물성으로 유지관리 측면에서 매우 유리하여 최근 많은 연구가 이루어지고 있다. 따라서 본 연구에서는 범용 유한요소 해석 프로그램인 ABAQUS를 이용하여 복합재료 패널로 보강된 철근 콘크리트 보의 극한 하중을 예측하고 실험을 수행하여 그 보강효과에 대한 고찰하였다. 복합재료 패널은 복합재료 패널 층의 유리섬유직조 형태에 따라 LT, DB, DBT로 구분하고 복합재료 패널의 층 개수에 따라 2ply, 3ply로 구분하였다. 실험을 수행한 결과, 해석과 일치하였으며 복합재료 패널로 보강한 철근 콘크리트 보가 극 한강도 측면에서 효율적이었다는 결론도 얻었다. Experiment on flexural analysis of RC beams strengthened with composite material panel is presented. Recently, the strengthening of reinforced concrete structures using advanced fiber reinforced plastic (FRP) composites, and in particular the behavior of FRP-reinforced concrete structure is topic that has become very popular because of good corrosion resistance and easy for site handling due to their light weight. In this study, an efficient computational analysis using ABAQUS to predict the ultimate moment capacity of reinforced concrete beams strengthened with FRP is presented. Test parameters in this study are the shape of fiber arrangement (LT, DB, DBT) and the number of carbon fiber sheets (2ply, 3ply). When comparing with results of the analytical model, results of the experiments show similar values. Furthermore, reinforced concrete beam with FRP obtains improved effects for ultimate strength.

아치 트러스 및 공간 트러스 구조의 비탄성 비선형 거동해석

김광중,정미루,김연태,백기열,이재홍,Kim, Kwang-Joong,Jung, Mi-Roo,Kim, Yeon-Tae,Baek, Ki-Youl,Lee, Jae-Hong 한국공간구조학회 2008 한국공간구조학회지 Vol.8 No.5

대공간 구조는 형태저항구조로서, 기둥-보로 구성되는 일반적인 건축골조구조가 설계외력에 대해 휨 및 전단으로 저항되는 것에 반해, 구조물의 내부에 기둥이 없는 공간을 내포하는 대공간 구조는 축력 및 면내 단면력에 의해 저항되는 경우가 대부분이다. 이러한 특성상 공간구조에는 일반적으로 장스팬이 사용되는 경우가 많으며, 그 결과 일반적인 골조와는 달리, 부재에 발생하는 변형도가 작은 경우에도 큰 변형이 발생하는, 즉 대변형 혹은 유한변형을 동반하게 된다. 일반적으로 수치해석에 있어 비선형 해석이란 기하학적 비선형 및 재료적 비선형, 또는 이 두 가지를 동시에 고려한 복합 비선형 해석을 들 수가 있다. 본 논문에서는 유한요소법으로 기하학적 비선형을 고려한 비선형 평형방정식을 적용하고, 부재의 응력-변형률 관계를 이용하여 재료적 비선형성도 함께 고려하였다. 사용된 수치해석 기법은 불안정 경로의 해를 찾아갈 수 있는 호장법을 적용하여 하중-변위 곡선을 추적하였다. 또한, 해석 결과는 범용 유한요소 프로그램인 ABAQUS를 이용하여 비교 검토하였다. 본 연구의 수치 해석결과 제시한 평면 및 공간 트러스의 비탄성 비선형 거동을 정확하고 효율적으로 예측 가능한 것으로 나타났다. Spatial structure is an appropriate shape that resists external force only with in-plane force by reducing the influence of bending moment, and it maximizes the effectiveness of structural system. With this character of the spatial structure, generally long span is used. As a result, large deflection is accompanied from the general frame. the structure is apt to result in a large deflection even though this structure experiences a small displacement in absence. Usually, nonlinear analysis in numerical analysis means geometric nonlinearity and material nonlinearity and complex nonlinearity analysis considers both of them. In this study, nonlinear equation of equilibrium considering geometric nonlinearity as per finite element method was applied and also considered the material nonlinearity using the relation of stress-strain in element. It is applied to find unstable result for tracing load-deflection curve in the numerical analysis tech. especially Arc-length method, and result of the analysis was studied by ABAQUS a general purpose of the finite element program. It is found that the present analysis predicts accurate nonlinear behavior of plane and space truss.

텐서그리티형 케이블 돔의 형상에 따른 형상 탐색

이수현(Lee Su-Hyun),정미루(Jung Mi-Roo),이재홍(Lee Jae-Hong) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)

This paper presents the form-finding procedure of cable dome structures. This structure is much more economical system than typical structures since it is possible that using fewer materials is able to gain as same strength with others. Moreover, these structures cannot become local due to vibrating easily by transferring loads rapidly. Therefore, Tensegrity system is effective way in area where earthquakes are a problem. However, these structures system has some disadvantages such as lack of design, analysis techniques, fabication complexity and relatively high deflections. In this study, investigated the efficiency of Tensegrity system through demonstrating stability by confirming self stable state according to prestresses and external force.

복합재료 패널로 보강된 철근 콘크리트 보의 휨 해석

김진만(Kim Jin-Man),정미루(Jung Mi-Roo),이재홍(Lee Jae-Hong),윤광섭(Yoon Kwang-Sup) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)

Recentry, because of good corrosion resistance and ease for site handling due to their light weight, the strengthening of reinforced concrete structures using advanced fiber reinforced plastic(FRP) composites, and in particular the behavior of FRP-reinforced concrete structures is topic that has become very popular. In this study, an efficient computational analysis to predict the ultimate moment capacity of reinforced concrete beams strengthened with FRP is presented. Test parameters in this study are the shape of fiber arrangement (LT, DB, DBT) and the number of carbon fiber sheets (2ply, 3ply). It is using the ABAQUS that is common finite element method for analysis of RC beam with composite material panel.