비틀림보강재의 강성변화에 따른 철근콘크리트 코아의 거동

정동조(Jung Dong-Jo),권명하(Kwon Moung-Ha) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.8

Based on the matrix approach, an investigation is made to get the forces and displacements of torsional loaded core<br/> structures with torsional reinforcements, and show the effect of torsional reinforcements on the behavior of the core structures.<br/> Using the boundary conditions at the reinforcement locations and the both ends of the core, the torsional rotation, St venant<br/> torsional moment, and bimoment are derived analytically. The optimum location of torsional reinforcements is obtained by<br/> maximizing the reduction of the torsional rotation at the top of core structures, and the effect of reinforcement stiffness on the<br/> optimum locations of torsional reinforcements is examined.<br/> Although the analysis presented herein is based on certain simplifying assumptions, it is believed that the results do provide<br/> sufficiently accurate information for determining the optimum location of torsional reinforcements in core structures. Significant<br/> reductions in core rotation can be obtained by judiciously selecting the locations.

여러 개의 파사드리거를 갖는 고층구조물에서 리거의 최적위치

정동조,육민혜,임병택,김석구,Jung, Dong-Jo,Yuk, Min-Hye,Lim, Byung-Taeg,Kim, Seok-Koo 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.2

구조물의 거동에 대한 파사드리거의 보강 효과를 검토하고 파사드리거의 최적위치를 추정할 수 있는 수치해석방법이 제시되었다. 구조물 상부의 수평변위를 최소화할 수 있는 파사드리거의 최적위치는 파사드리거의 구속효과에 의한 수평변위 감소량을 극대화함으로서 구할 수 있으며 가새골조와 파사드리거의 휨강성과 전단강성에 의해 크게 영향을 받는다. 본 연구에서는 3가지 형태의 하중, 즉 등분포하중과 삼각분포하중 그리고 구조물 상단에 작용하는 집중하중이 고려되었다. 파사드리거의 최적위치는 무차원 강성변수 ${\omega}$와 ${\beta}$의 함수로서 표현되었으며, 1개부터 4개의 파사드리거를 갖는 구조물을 대상으로 최적위치에 대한 도표를 작성하였다. 비록 본 연구에서 제시된 해석방법이 몇 가지의 가정을 기초로 유도되었으나 고층건물의 초기설계단계에서 파사드리거의 최적위치 결정을 위한 비교적 정확한 정보를 제공할 수 있다고 사료된다. Numerical analyses are performed to show the effect of stiffening facade riggers on the behavior of the structure and to investigate the optimum locations of facade riggers. Optimum locations of the facade riggers to minimize the drift at the top of the structure are obtained by maximizing the drift reduction caused by the facade riggers and are significantly influenced by the bending and shear stiffnesses of the braced frame and facade riggers. Three standard load cases of uniformal and triangularly distributed lateral loads as well as a lateral point load at the top of the structure are considered in this paper Optimum locations of facade riggers are plotted as functions of nondimensional relative stiffness parameters ${\omega}$ and ${\beta}$ for structures with one to four riggers. Although the analysis presented herein is based on certain simplifying assumptions, it is believed that the results do provide sufficiently accurate information for determining the optimum locations of facade riggers in highrise structures.

여러개의 파사드리거를 갖는 고층구조물의 응력과 변위

육민혜,정동조,Yuk, Min-Hye,Jung, Dong-Jo 한국전산구조공학회 2005 한국전산구조공학회논문집 Vol.18 No.2

파사드리거는 아웃리거 구조시스템에 rms거하는 것으로 구조물의 외곽에 설치되는 파사드리거는 구조물의 내부에 수직으로 설치된 가새골조로부터 분리되어 구조물의 외곽에 설치된다. 따라서 이 시스템은 중앙의 코아에 부착되는 아웃리거와는 달리 사재로 인한 내부 동선의 장애가 발생하지 않는 장점이 있다. 리거의 현재에 인접한 슬래브가 파사드리거와 가새골조 사이의 전단력을 전달하며 가새골조와 파사드리거를 지지하는 기둥 사이의 상호작용을 일으킨다. 이 논문에서는 등분포하중과 삼각분포하중, 그리고 구조물 상단에 집중하중이 작용하고 구조물의 외곽에 여러개의 파사드리거가 설치된 가새골조에 대한 근사해석방법을 제시하였으며, 구조모델들을 이용하여 MIDAS프로그램에 의한 결과와 비교하였고 만족할만한 결과를 얻었다. 본 연구에서 제시된 매트릭스 해석방법은 구조물 상단의 수평변위나 가새골조 하단의 전도모멘트와 같은 구조물의 거동에 대한 파사드리거의 영향을 신속하게 평가할 수 있으며 구조물 상단의 변위를 최소화할 수 있는 파사드리거의 최적위치 결정을 위해 유용하게 사용될 수 있을 것이다. In the conventional outrigger system, the outriggers are located in the planes of the core walls and this system has disadvantage of obstructing flexibility in the interior layout. But thc facade riggers in the structure uc located In the exterior frames in the direction of the lateral loading. The interaction between the traced frames and facade riggers is through the floor diaphragms adjacent to the chords of the riggers. This paper presents an approximate analysis technique lot preliminary analysis of multiple facade rigger stiffened braced frames in tall buildings subjected to uniformly and triangularly distributed loads as well as a lateral point load at the top of the structure. Comparisons with the results by the program MIDAS for the structural models have shown that this analysis can give reasonably accurate results for highrise braced frames with multiple facade riggers. The method allows a simple procedure for obtaining the optimum level of the facade riggers in addition to a rapid assessment of the influence of the facade riggers on the performance of the highrise structure such as the reduction in lateral deflection at the top and the overturning moment at the base of the braced frame.

고지혈증 동물모델에서 표고버섯(Lentinus edodes) 추출물이 항고지혈증에 미치는 영향

김계엽(Gye-Yeop Kim),정동조(Dong-Jo Jung),김은정(Eun-Jung, Kim) 한국약용작물학회 2013 한국약용작물학회 학술대회논문집 Vol.2013 No.1

지상 레이저 스캐닝을 이용한 보 구조물의 변위 및 변형 형상 계측을 위한 개선된 모델

이홍민(Lee Hong-Min),정동조(Jung Dong-Jo),이임평(Lee Im-Pyeong),박효선(Park Hyo-Seon) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.4

This paper presents an improved model to accurately measure displacements and deformed shapes of beam structures using terrestrial laser scanning (TLS). In comparison with previous model, this model is added of four components : 1) formulation of polynomial shape function, 2) application of boundary condition, 3) inducement of compatibility condition and 4) evaluation of error vector and determination of reasonable polynomial shape function. The proposed model is applied to displacement measurement of simply supported steel beams subjected to a point load. The performance of the proposed model is investigate by comparing the displacements obtained from the model and displacements directly measured from LVDTs.

여러 개의 아웃리거와 병렬전단벽을 갖는 구조물의 거동

정동조,이태희 전주대학교 공학기술종합연구소 2003 전주대학교 공학기술종합연구소 학술논문집 Vol.9 No.1

As the buildings have become high-rise, the lateral load resisting systems to support horizontal force have played very important roles to control the lateral drift of high-rise buildings. This paper presents an approximate analysis of multioutrigger-braced structures with a pair of coupled shear walls and investigates the behaviors of the structures according to the core location. Based on the certain simplified assumptions, the outrigger restraining moment, core moment, core axial force, column axial force, horizontal deflection are derived analytically. Comparison with the results by the MIDAS-GEN program for structural models has shown that the proposed approximate formulae can give reasonably accurate results for multioutrigger-braced structures with a pair of coupled shear walls.

개단면 전단벽구조물의 비틀림거동에 관한 연구

정동조,김병권 전주대학교 공학기술종합연구소 2000 전주대학교 공학기술종합연구소 학술논문집 Vol.6 No.1

This paper presents basic equations applicable in the analysis of a wide variety of complex shaped shear walls. Using these equations, a back-of-the-envelope type of calculations may be performed to get an idea of the maximum rotation at the top, and the maximum axial and shear stresses at the base of shear wall structures subjected to torsion. Three typical load cases, i.e. uniform torque, linearly varying torque and concentrated torque at the top of the structure, are considered in the analysis. Comparison with the results by the MIDAS program for structural models has shown that the proposed approximate formulae can give reasonably accurate results for shear wall structures with open sections. Formulae presented herein may be used to estimate the stresses and torsional rotations of structural systems consisting of open section cores in the preliminary design stage.

외부기둥과 아웃리거의 강성변화에 따른 아웃리거구조물의 응력과 변위

정동조 전주대학교 공학기술종합연구소 2000 전주대학교 공학기술종합연구소 학술논문집 Vol.6 No.1

The Objective of this study is to provide a guide to the member sizes of practical outrigger structures in the preliminary stages of design. A structure with two outriggers was taken for comparing of the behavior characteristics-especially horizontal resistance capacity. The variation of the Axial and flexural rigidities of exterior column and core effects the horizontal deflections, core axial force, core moment, column axial forces and outrigger restraining moments of outrigger structures.

여러개의 아웃리거를 갖는 구조물에서 아웃리거의 최적위치 결정

정동조,신순주 전주대학교 공학연구소 1998 전주대학교 공학기술종합연구소 학술논문집 Vol.4 No.1

Analysis of outrigger and belt truss structures with a linearly varying core and exterior columns, subjected to a triangular load distribution has been made. This is useful for considering graduated wind loading and static equivalent earthquake loading. Optimum levels of the outrigger and belt trusses for minimum top drift are obtained by maximizing the drift reduction caused by the outriggers and are plotted as a function of a nondimensional relative stiffness parameter ω, for structures with one to four outriggers and with variable stiffnesses of the core and outrigger system. The optimum levels for structures subjected to a triangularly distributed load, with its apex at the base, are 0.03H higher than for structures subjected to a uniformly distributed load.

벨트트러스의 최적위치결정에 관한 연구

정동조 전주대학교 공학연구소 1996 전주대학교 공학기술종합연구소 학술논문집 Vol.2 No.2

Analysis of outrigger and belt truss structures with a linearly varying core and exterior columns, subjected to a triangular load distribution has been made. This is useful for considering graduated wind loading and static equivalent earthquake loading. Optimum levels of the outrigger and belt trusses for minimum top drift are obtained by maximizing the drift reduction caused by the outriggers and are plotted as a function of a nondimensional relative stiffness parameter ω, for structures with two outriggers and with variable stiffnesses of the core and outrigger system. The optimum levels for structures subjected to a triangularly distributed load, with its apex at the base, are 0.02H - 0.03H higher than for structures subjected to a uniformly distributed load.