• Title/Summary/Keyword: 강성 편심

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Analyses of Structural Behaviors According to Core Location in the Building with Symmetric Plan (대칭 평면형 건물에서의 코어위치에 따른 구조거동 분석)

  • Kim, Jung-Rae;Kim, Jae-Yo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.24 no.1
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    • pp.116-124
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    • 2020
  • In order to analyze the lateral-load resisting capability according to the core locations, three-dimensional structural analyses were performed for 20-story buildings with symmetric plan. Four analytical models for a center core, a single-axial eccentric core, and a double-axial eccentric core were constructed, and eigenvalue analyses, wind-load analyses, and earthquake-load analyses were performed. Torsion did not occur in the central core building, but the bending and torsion occurred in combination with the arrangement of the eccentric core, and the lateral-load resisting capability was degraded. The change in the wind load according to the eccentric core was small, but the maximum lateral displacement was found to increase greatly by the eccentric arrangement of the core. In addition, in case of the eccentric core, the seismic load was slightly reduced compared to the center core due to the decrease in the lateral stiffness, but it was found that the maximum story drift ratio increased significantly due to the torsional effect. Based on these results, the structural behavior according to the position of the core can be clearified and used as a guideline for core locations in the planning and design stage.

Structural Analysis Models to Develop Live Load Distribution Factors of Simply Supported Prestressed Concrete I-Girder Bridge (활하중 분배계수식 개발을 위한 I형 프리스트레스트 콘크리트 거더 교량의 구조해석 모델)

  • Lee, Hwan-Woo;Kim, Kwang-Yang
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.21 no.1
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    • pp.91-101
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    • 2008
  • Structural analysis models to develop live load distribution factors of simply supported prestressed concrete I-girder bridge should have the precision of the analysis results as well as modeling simplicity. This is due to the numerous frequency of structural analysis needed while developing live load distribution factors. In this study, an appropriate structural analysis model is selected by comparing previous researchs studies and models used in practical design. Also, the influence by the flexural stiffness of barrier and diaphragm on the live load distribution had been analyzed through comparing the numerical analysis and experimental tests. As a result, the model that the eccentric girder and the barrier and diaphragm are connected to the deck plate was appropriate in satisfying both accuracy and simplicity for structural analysis of simply supported prestressed concrete I-girder bridge. However, the barrier was analyzed to have insignificant influence on the live load distribution in spite of its variation of stiffness. The eccentric diaphragm showed little influence at 25% or higher of flexural stiffness. From the results, a model that the girder is rigidly connected to the deck plate in consideration of the eccentricity, the barrier is ignored and the whole section of diaphragm is supposed to be valid without eccentricity is decided as the most appropriate structural model to develop the live load distribution factors of simply supported prestressed concrete I-girder bridge in this study.

Axial Load Performance of Circular CFT Columns with Concrete Encasement (콘크리트피복 원형충전강관 기둥의 압축성능)

  • Lee, Ho Jun;Park, Hong Gun;Choi, In Rak
    • Journal of Korean Society of Steel Construction
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    • v.27 no.6
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    • pp.525-536
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    • 2015
  • An experimental study was performed to investigate the axial-flexural load-carrying capacity of concrete-encased and-filled steel tube (CEFT) columns. To restrain local buckling of longitudinal bars and to prevent premature failure of the thin concrete encasement, the use of U-cross ties was proposed. Five eccentrically loaded columns were tested by monotonic compression. The test parameters were axial-load eccentricity, spacing of ties, and the use of concrete encasement. Although early cracking occurred in the thin concrete encasement, the maximum axial loads of the CEFT specimens generally agreed with the strengths predicted considering the full contribution of the concrete encasement. Further, due to the effect of the circular steel tube, the CEFT columns exhibited significant ductility. The applicability of current design codes to the CEFT columns was evaluated in terms of axial-flexural strength and flexural stiffness.

Behavior Analysis of Eccentrically Loaded Restrained Reinforced Concrete Slender Columns (편심축하중을 받는 구속 RC장주의 거동 해석)

  • Park, Jai Oun;Choung, Kyoung Hee
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.10 no.4
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    • pp.11-24
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    • 1990
  • The effect of end restraints for adjoining members is the different variables influencing the column ultimate strength and the behavior. The propose of this study is to analyze eccentrically loaded reinforced concrete columns with the end restraind effect having rectangular cross-section and general boundary conditions. Accordingly, this investigation are to construct a typical analytical model of the reinforced concrete columns with general end boundary conditions. The mechanical components of the analytical model are to be rationally defined the actual behavior as possible, and the different variables influencing the behavior and the ultimate strength of the reinforced concrete columns are investigated by using a parametric study.

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Seismic Performance of Low-rise Piloti RC Buildings with Eccentric Core (편심코어를 가지는 저층 철근콘크리트 필로티 건물의 내진성능)

  • Kim, Sung-Yong;Kim, Kyung-Nam;Yoon, Tae-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.10
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    • pp.490-498
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    • 2020
  • In this study, the seismic performance of low-rise piloti buildings with eccentric core (shear wall) positions was analyzed and reviewed. A prototype was selected among constructed low-rise piloti buildings with eccentric cores designed based on KBC2005. The seismic performance of the building showed plastic behavior in the X-direction and elastic behavior in the Y-direction. The inter-story drift is larger than that of a concentric core case and has the maximum allowed drift ratio. The displacement ratio of the first story is much larger than that of upper stories, and the frame structure in the first story is vulnerable to lateral force. Therefore, low-rise piloti buildings with eccentric cores need to have less lateral displacement, as well as reinforcement of the lateral resistance capacity in seismic design and seismic retrofit.

Initial Imperfection Sencitivity in Stiffened Plates (보강판의 초기결함 민감성 연구)

  • 김천욱;원종진
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.8 no.3
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    • pp.264-273
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    • 1984
  • 초기경향이 있는 보강평판의 비선형 운동 방정식을 Galerkin method에 의하여 유도하였다. Runge Kutta method를 사용하여 step-load를 받고 있는 보강평판의 동적 좌굴문제의 수치해를 구하였다. 정적 좌굴실험에 의하여 좌굴하중을 결정함에 있어 동적 해석법을 응용할 수 있음을 입증하였으며, step-load를 받는 보강평판의 동적 좌굴해석으로 정적좌굴의 초기결함 민감성을 해 석하였다. 보강평판의 초기결함민강성은 평판보다 훨씬 낮으며 보강재의 편심비가 높을수록 민감 성은 둔화된다.

Stiffness and Load Matrix for Finite Parallelogrammic Plate Bending Element (평행사변형 유한요소의 강성 매트릭스와 하중 매트릭스)

  • 조병완
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1989.04a
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    • pp.28-32
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    • 1989
  • In the recent years, parallelogrammic shape structures were often introduced in the Civil Engineering. Especially parallelogrammic shape highway slabs, which were used in the portions of Interstate-75, U.S.A., were a unique one to result in only one wheel crossing the joint at any one time. In this reserch, major efforts were made to provide an appropriate subroutine program and to study an analytical behavior of paralleloqrammic plate bending element by developing the stiffness and load matrices.

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기초, 굴착

  • 정교철;오대열
    • Proceedings of the KSEG Conference
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    • 2004.03a
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    • pp.24001-24056
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    • 2004
  • 암반 기초에서 발생 가능한 파괴형태로는 $\circled1$전단파괴(Shear failure) $\circled2$관입파괴(punch failure) $\circled3$붕락(Collapse) $\circled4$균열파괴 (cracking) $\circled5$분쇄상파괴 (crushing) $\circled6$쐐기상파괴 (wedging)를 들 수 있다. 그림 2.4-1에서 (a)는 연암층 내에서의 전형적인 전단파괴를 나타내고, (b)는 소성암반 상부에 강성암반이 놓였을 때의 전단파괴를 보여준다. (c)는 2층으로 구성된 지반에서의 전단파괴 양상이며, (d)는 편심하중이 작용할 때의 전단파괴이다. (e)는 사면 상에서의 활동에 의한 파괴유형이다. (f)는 절리가 발달한 풍화된 암반내로 진행되는 관입파괴를 보여주고 있다. (e)는 연암지반 내부로 강성암반이 관입되어 파괴된 모습이다. (h)는 풍화된 화강암에서의 관입파괴 유형이다. (i)는 석회암층 내부의 지하공동에 의한 붕락현상을 보여주고 있으며, (j)는 지하수의 유동에 의해 형성된 공동으로 인한 붕락파괴를 나타낸다. (k)는 균열파괴, (l)은 분쇄상 파괴, (m) 쐐기상 파괴, (n)은 단층선을 따른 파괴 유형이다. (중략)

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An Experimental Study on Behavior of Box Girder considering Middle Diaphragm Shapes (중간격벽의 형상을 고려한 상자형 거동에 대한 실험적 연구)

  • 정희효;이승열
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.15 no.3
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    • pp.501-510
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    • 2002
  • The middle diaphragm of box girder is to prevent the deformation of the cross section of box girder, to distribute load produced at upper flange onto the both sides of web. But if inner space of box girder is barred by the middle diaphragm, it is impossible to use in inner space of box girder and it is felt constraint on maintenance-management. The effect of middle diaphragm of box girder is intended to be expressed by the stiffness of diaphragm in comparing the diaphragm with opening of box girder with diaphragm without opening of box girder through the experiment.

A Parametrical Study on the flexural strength of Concrete-Filled SHS Columns to Composite H-Beam Connections (충전각형강관 기둥-합성 H형강보 접합부 휨성능 결정요인에 관한 연구)

  • Lee, Jong Seok
    • Journal of Korean Society of Steel Construction
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    • v.11 no.4 s.41
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    • pp.385-395
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    • 1999
  • Square hollow section columns and H-section beams have recently been increasing1y used. Rigid column-beam connections cannot be made for the structural system and thus some measures to improve the rotational stiffness of connections should be developed. For this purpose, several types of connections. such as H-section beams connected to concrete-filled square hollow section columns, have been contrived and put to experiment. Since the experimental works are usually difficult and expensive. Particularly test of all the types of connections with similar behavior may not be feasible. Instead, the numerical analysis will be adopted predict the flexural stiffness of connections. In this work, FEM modeling techniques are examined and parametric analysis study has been carried out. The major parameters considered are concrete strength, thickness of steel column, magnitude and eccentricity of axial forces.

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