• Title/Summary/Keyword: 전단력전달

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Influence of Column Aspect Ratio on the Hysteretic Behavior of Slab-Column Connection (슬래브-기둥 접합부의 이력거동에 대한 기둥 형상비의 영향)

  • Choi, Myung-Shin;Cho, In-Jung;Ahn, Jong-Mun;Shin, Sung-Woo
    • Journal of the Korea Concrete Institute
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    • v.19 no.4
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    • pp.515-525
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    • 2007
  • In this investigation, results of laboratory tests on four reinforced concrete flat plate interior connections with elongated rectangular column support which has been used widely in tall residential buildings are presented. The purpose of this study is to evaluate an effect of column aspect ratio (${\beta}_c={c_1}/{c_2}$=side length ratio of column section in the direction of lateral loading $(c_1)$ to the direction of perpendicular to $c_1$) on the hysteretic behavior under earthquake type loading. The aspect ratio of column section was taken as $0.5{\sim}3\;(c_1/c_2=1/2,\;1/1,\;2/1,\;3/1)$ and the column perimeter was held constant at 1200mm in order to achieve nominal vertical shear strength $(V_c)$ uniformly. Other design parameters such as flexural reinforcement ratio $(\rho)$ of the slab and concrete strength$(f_{ck})$ was kept constant as ${\rho}=1.0%$ and $f_{ck}=40MPa$, respectively. Gravity shear load $(V_g)$ was applied by 30 percent of nominal vertical shear strength $(0.3V_o)$ of the specimen. Experimental observations on punching failure pattern, peak lateral-load and story drift ratio at punching failure, stiffness degradation and energy dissipation in the hysteresis loop, and steel and concrete strain distributions near the column support were examined and discussed in accordance with different column aspect ratio. Eccentric shear stress model of ACI 318-05 was evaluated with experimental results. A fraction of transferring moment by shear and flexure in the design code was analyzed based on the test results.

Vertical Load Transfer Mechanism of Bucket Foundation in Sand (사질토 지반에 설치된 버킷기초의 수직 하중전이 특성)

  • Park, Jeong-Seon;Park, Duhee;Yoon, Se-Woong;Jang, Hwa-Sup
    • Journal of the Korean Geotechnical Society
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    • v.31 no.7
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    • pp.29-39
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    • 2015
  • The vertical load imposed on the bucket foundation is transferred from the soil inside the bucket to the bottom of the foundation, and also to the outer surface of the skirt. For the design of a bucket foundation installed in sand, the vertical load transfer characteristics have to be clearly identified. However, the response of bucket foundations in sand subjected to a vertical load has not been investigated. In this study, we performed two-dimensional axisymmetric finite element analyses and investigated the vertical load transfer mechanism of bucket foundation installed in sand. The end bearing capacity of bucket foundation is shown to be larger than that of the shallow foundation, whereas the frictional resistance is smaller than that for a pile. The end bearing capacity of the bucket foundation is larger than the shallow foundation because the shear stress acting on the skirt pushes down and enlarges the failure surface. The skin friction is smaller than the pile because the settlement induces horizontal movement of the soil below the tip of the foundation and reduces the normal stress acting at the bottom part of the skirt. The calculated bearing capacity of the bucket foundation is larger than the sum of end bearing capacity of shallow foundation and skin friction of pile. This is because the increment of the end bearing capacity is larger than the reduction in the skin friction.

Design of Flat Plate Systems Using the Modified Equivalent Frame Method (수정된 등가골조법을 이용한 플랫플레이트 시스템의 설계)

  • Park, Young-Mi;Oh, Seung-Yong;Han, Sang-Whan
    • Journal of the Korea Concrete Institute
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    • v.20 no.1
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    • pp.35-41
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    • 2008
  • In general, flat plate systems have been used as a gravity load resisting system (GLRS) in building. Thus, this system should be constructed with lateral force resisting system (LFRS) such as shear walls and brace frames. GLRS should retain the ability to undergo the lateral drift associated with the LFRS without loss of gravity load carrying capacity. And flat plate system can be designed LFRS as ordinary moment frame with the special details. Thus, flat plate system designed as GLRS or LFRS should be considered internal forces (e.g., unbalanced moments) and lateral deformation generated in vicinity of slab joints render the system more susceptible to punching shear. ACI 318 (2005) allows the direct design method, equivalent frame method under gravity loads and allows the finite-element models, effective beam width models, and equivalent frame models under lateral loads. These analysis methods can produce widely different result, and each has advantage and disadvantages. Thus, it is sometimes difficult for a designer to select an appropriate analysis method and interpret the results for design purposes. This study is to help designer selecting analysis method for flat plate system and to verify practicality of the modified equivalent frame method under lateral loads. This study compared internal force and drift obtained from frame methods with those obtained from finite element method under gravity and lateral loads. For this purposes, 7 story building is considered. Also, the accuracy of these models is verified by comparing analysis results using frame methods with published experimental results of NRC slab.

Experiments on Interfacial Properties Between Ground and Shotcrete Lining (지반과 숏크리트 라이닝의 인터페이스 특성에 관한 실험적 연구)

  • 장수호;이석원;배규진;최순욱;박해균;김재권
    • Journal of the Korean Geotechnical Society
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    • v.20 no.5
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    • pp.79-86
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    • 2004
  • Interfacial properties between rock mass and shotcrete play a significant role in the transmission of loads from the ground to shotcrete. These properties have a major effect on the behaviours of rock mass and shotcrete. They, however, have merely been considered in most of numerical analyses, and little care has been taken in identifying them. This paper aimed to identify interfacial properties including cohesion, tension, friction angle, shear stiffness, and normal stiffness, through direct shear tests as well as interface normal compression tests for shotcrete/rock cores obtained from a tunnel sidewall. Mechanical properties such as compressive strength and elastic modulus were also measured to compare them with the time-dependent variation of interfacial properties. Based on the experiments, interfacial properties between rock and shotcrete showed a significant time-dependent variation similar to those of its mechanical properties. In addition, the time-dependent behaviours of interfacial properties could be well regressed through exponential and logarithmic functions of time.

Visualization and Image Processing for Measurement of Propagational Velocity of Shear Front (유동장의 이동속도측정을 위한 가시화 및 영상처리 방안)

  • Kim Jae-Won;Han Sang-Hoon;Ahn Eun-Young
    • Journal of Korea Multimedia Society
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    • v.8 no.10
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    • pp.1322-1328
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    • 2005
  • The circulation flows passing through the Ekman boundary layer on the rotating disk and transfer the angular momentum into the interior region of the container. Consequently, the circulation enhances the momentum transfer and the interior fluid is divided by a propagating shear front. This investigation focuses on computer vision and image processing technique for analysis of Non-Newtonian Fluids. To visualize marching velocity shear front for the transient flow, a particular shaped particles and light are used. To validate the proposed method, quantitative image are compared with the optical data acquired by a direct measurement of LDV (Laser Doppler Velocimetry).

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Forces and Displacements of Highrise Braced Frames with Facade Riggers (여러개의 파사드리거를 갖는 고층구조물의 응력과 변위)

  • Yuk, Min-Hye;Jung, Dong-Jo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.18 no.2
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    • pp.181-190
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    • 2005
  • 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.

Development of Finite Element Analysis Program for the Concrete Pavement (유한 요소법에 의한 콘크리트 포장도로의 구조해석 프로그램개발)

  • 조병완
    • Computational Structural Engineering
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    • v.3 no.2
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    • pp.89-95
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    • 1990
  • As modern industry go further, a rigid concrete pavement has been widely constructed. The load carrying capacity of the flexible asphalt pavements is brought about by a layered system, distributing the load over the subgrade, rather than by the bending action of the slab. On the other hand, the rigid pavement, because of its rigidity and high modulus of elasticity, tends to distribute the traffic load over wide subbases, and its capacity of the strength is supplied by the slab itself. Thus, it is necessary to study the structural behavior of concrete slab under the variations of temperature changes and applied traffic loads. It reguires the development of finite element analysis program for the concrete highway pavement, which provides better understanding of concrete pavement behavior and effective design data to highway engineers.

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The Properties for Structural Behavior of Beam-Column Joint Consisting of Composite Structure (혼합구조로 이루어진 보-기둥 접합부의 구조적 거동 특성)

  • Lee, Seung Jo;Park, Jung Min;Kim, Wha Jung
    • Journal of Korean Society of Steel Construction
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    • v.12 no.4 s.47
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    • pp.445-455
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    • 2000
  • This study proposed to beam-column joint model consisting of different type structural member to develop new structural system in the structural viewpoint as to a method to overcome various problem according to change of construction environment. This study promoted rigidity and capacity to stiffen reinforced concrete for steel structure end to increase rigidity of long spaned steel beam, and welt to steel flange to anchor U-shaped main bar of SRC structure end to easy stress flow between the different type structure. Through the series of experiments, proposed to possibility of this joint model, and investigated joint rigidity and capacity.

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Effects of Intermeshing Rotor for Dispersion of Silica Agglomerates in SBR/BR Compound (Intermeshing Rotor의 구조가 SBR/BR 합성고무 복합소재의 실리카 분산에 미치는 영향의 비교)

  • Kim, Sung-Min;Kim, Kwang-Jea
    • Polymer(Korea)
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    • v.36 no.5
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    • pp.637-642
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    • 2012
  • The effects of mixing geometry (intermeshing vs. tangential rotor) for the dispersion and distribution of silica agglomerates in SBR/BR compound were investigated. Silica dispersion and distribution were found to be better with the intermeshing rotor compared to the tangential rotor. It was concluded that the intermeshing rotor compared to the tangential rotor delivered a higher shear stress due to interlocked rotor geometry to silica agglomerates leading to better dispersity and distribution of silica in the agglomerates.

Cyclic Seismic Performance of Reduced Beam Section Steel Moment Connections: Effects of Panel Zone Strength and Beam Web Connection (패널존 강도 및 보 웨브 접합방식이 RBS 철골 모멘트접합부의 내진거동에 미치는 영향)

  • Lee, Cheol-Ho;Jeong, Sang-Woo;Kim, Jin-Ho
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2003.03a
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    • pp.337-348
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    • 2003
  • 본 연구는 8개의 RBS (reduced beam section) 내진 철골모멘트접합부의 실물대 실험결과를 요약한 것이다. 본 실험의 주요변수는 보 웨브 접합법 및 패널존 강도를 택하였다. 균형 패널존 시험체는 접합부의 내진성능을 감소시키지 않으면서, 보와 패널존이 함께 균형적으로 지진에너지를 소산시키도록 설계하여 값비싼 패널존보강판(doubler plates)의 수요를 줄이고자 시도한 것이다. 보 웨브를 용접한 시험체는 모두 특별 연성모멘트골조에서 요구되는 접합부 회전능력을 충분히 발휘하였다. 반면 보 웨브를 볼트접합한 시험체는 조기에 스캘럽을 가로지르는 취성파단이 발생하는 열등한 성능을 보였다. 보 그루브 용접부 자체의 취성파괴가 본 연구에서와 같이 양질의 용접에 의해 방지되면, 스켈럽 부근의 취성파단이 다음에 해결해야 할 문제로 대두되는 경향을 보인다. 보 웨브를 볼팅한 경우에 접합부 취성파단의 빈도가 월등히 높은 이유를 실험 및 해석결과를 토대로 제시하였다 측정된 변형도 데이터에 의할 때, 접합부의 전단력 전달메카니즘은 흔히 가정하는 고전 휨이론에 의한 예측과 전혀 다르다. 이는 전통적 보 웨브 설계법을 재검토할 필요가 있음을 시사하는 것이다. 아울러, 본 연구의 제한된 실험자료 및 접합부에서 요구되는 바람직한 거동기준을 근거로 균형 패널존의 강도범위에 대한 예비적 추정치를 제시하였다.

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