• Title, Summary, Keyword: 강성

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Effect of Shear Wall Stiffness on Optimal Location of Core and Offset Outrigger Considering Floor Diaphragm (바닥 격막을 고려한 코어 및 오프셋 아웃리거 구조의 최적위치에 대한 전단벽 강성의 영향)

  • Kim, Hyong-Kee
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.23 no.5
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    • pp.37-47
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    • 2019
  • The study purposed to investigate the optimal location of core and offset outrigger system considering floor diaphragm. To accomplish this aim, a structure design of 70 stories building was performed by using MIDAS-Gen. And the leading factors of the analysis research were the slab stiffness, the stiffness of shear wall and the outrigger position in plan. Based on the analysis results, we analyzed and studied the influences of the shear wall stiffness and the slab stiffness on optimal location of core and offset outrigger considering floor diaphragm. The results of the analysis study indicated whether the slab stiffness, the stiffness of shear wall and the outrigger position in plan had an any impact on optimal location in outrigger system of tall building. Also the paper results can give help in getting the structural engineering materials for looking for the optimal position of outrigger system in the high-rise building.

A Study on Relationship between Track Impact Factor and Track Support Stiffness of Turnout System on Urban Transit (도시철도 분기기 궤도구조의 궤도지지강성과 궤도충격계수의 상관관계에 관한 연구)

  • Choi, Jung-Youl;Park, Jong-Yoon;Lee, Kyu-Yong;Chung, Jee Seung
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.2
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    • pp.461-466
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    • 2020
  • In this study, the relationship between the track support stiffness and the track impact factor for a sleeper floating track and a turnout system with wood ties currently employed in Korean urban transit was assessed by performing field tests using actual vehicles running along the service lines. Field tests were performed on four track systems (i.e., sleeper floating track, and point, lead and crossing sections of turnout system). The theoretically designed track impact factor and track support stiffness were compared with the corresponding track impact factor and track support stiffness measured through field tests for the target tracks on the service line. The track impact factor for the service line appeared to increase with the deviation of track support stiffness according to vehicle driving direction; therefore, it was inferred that the deviation of track support stiffness between each track section directly affected the track impact factor.

Equivalent Column Stiffness Equations for Design of RC Slender Columns under Later Loads (횡하중을 받는 철근콘크리트 장주설계를 위한 기둥의 등가강성식)

  • 이재훈
    • Magazine of the Korea Concrete Institute
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    • v.7 no.1
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    • pp.156-164
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    • 1995
  • P-${\Delta}$ analysis by use of the equivalent colurnn stiffness determined by Momcnt curvature-Thrust curves provides relatively precise analytical results for unbraced reinforced concrete columns, however it needs a complicated arialytical procedure. Equ~valent col~rnn stiffness equations are proposed for a simple analytical procedure which are ckterrnined by the Moment-Curvature Thrust curves of the practically useable sections. Thc proposed stiffness equations are appiled to P-${\Delta}$ analysis and rnornent magnifier method to compare with the selected test result. Use of the proposed stiffness equations may slrnplify the P-${\Delta}$ i.rialvtica1 procedure and improve the accuracy of moment magnifier niethod.

Stiffness analysis of leaf type holddown spring assemblies (판형 홀드다운 스프링 집합체의 강성해석)

  • 송기남;임현태
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.1
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    • pp.215-222
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    • 1993
  • A general method is proposed for stiffness analysis of the leaf springs only using the geometric data and Young's modulus of the leaf springs. In this method, an engineering beam theory and Castigliano's theory are applied for the derivation of the stiffness of the leaf springs. To show realiability and effectiveness of this method, the stiffness from the proposed method is compared with the results for various types of leaf springs. From these comparisons the proposed method has been proved to be effective and reliable to estimate the stiffness of the leaf springs.

An Analytical Study on Flexural Behaviors of CFT Girder (CFT 거더의 휨 거동 평가를 위한 해석적 연구)

  • Ko, Hee Jung;Moon, Jiho;Lee, Hak Eun
    • 한국방재학회:학술대회논문집
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    • pp.35-35
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    • 2011
  • CFT가 갖는 다양한 구조적 이점으로 인해, 축력이 지배적인 기둥 구조물에만 주로 적용되던 CFT 요소가 점차 거더에 적용되어 가고 있다. 그러나, 현재 CFT 요소에 대한 설계 기준은 축력이 지배적인 보-기둥 구조물에 대한 것으로 제한되어 있으며, 휨이 지배적인 보 구조물에 대한 현행 설계 기준의 적용성을 검토해야 할 필요가 있다. 현행 설계기준에서 제시하고 있는 CFT 요소의 극한 강도 평가방법은 소성응력분배법 및 변형률적합법으로 구분되어지며, 각 방법을 이용한 극한 강도의 평가결과를 기존 연구자들의 CFT 요소 휨 실험결과와 비교 분석하였다. 휨 강성 평가에 대한 타당성을 검증하기 위해 AISC에서 제시하는 휨 강성 평가식을 기존 실험 연구와 비교 검토하였으며, 아울러 압축력에 따라 휨 강성을 보정할 수 있도록 수정된 Roeder et al.의 제안식을 함께 검토하였다. 검토 결과, 강도 평가에 있어서는 설계 기준에서 제안하는 두 방법 모두 CFT 거더의 휨 강도를 적절히 평가할 수 있었으며, 강성 평가에 있어서는 설계 기준의 제안식이 휨 초기 강성을 적절히 평가하는 반면 사용 단계에서의 휨 강성은 Roeder et al.의 수정된 강성 평가식에 의해 적절히 평가할 수 있음을 확인하였다.

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A study on the Accurate Comparison of Nonlinear Solution Which Used Tangent Stiffness Equation and Nonlinear Stiffness Equation (접선 강성방정식과 비선형 강성방정식을 이용한 비선형 해의 정확성 비교에 관한 연구)

  • Kim, Seung-Deog;Kim, Nam-Seok
    • Journal of Korean Association for Spatial Structures
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    • v.10 no.2
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    • pp.95-103
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    • 2010
  • This paper study on the accuracy improvement of nonlinear stiffness equation. The large structure must have thin thickness for build the large space structure there fore structure instability review is important when we do structural design. The structure instability of the shelled structure is accept it sensitively by varied conditions. This come to a nonlinear problem with be concomitant large deformation. Accuracy of nonlinear stiffness equation must improve to examine structure instability. In this study, space truss is analysis model Among tangent stiffness equation and nonlinear stiffness equation is using nonlinearity analysis program. The study compares an analysis result to investigate accuracy and convergence properties improvement of nonlinear stiffness equation.

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The Element Stiffness Ratio and Outrigger Locations for Optimum Design Model in Preliminary Design of Outrigger Structures by G.A. (G.A.를 이용한 아웃리거 시스템의 초기설계단계에서 부재 강성비 및 아웃리거 위치 최적화에 관한 연구)

  • Lee, Eun-Seok;Choi, Se-Woon;Park, Hyo-Seon
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.721-724
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    • 2010
  • 아웃리거 시스템은 고층건물의 구조설계 시에 횡변위를 제어하기 위해 사용되는 가장 효율적이고 널리 사용되는 구조시스템 중 하나이다. 아웃리거는 설치 위치의 최적성에 따라 횡변위 제어효과에 상당한 차이가 있으며, 1970년대 이후부터 아웃리거의 최적위치에 관한 연구가 활발히 진행되어 왔다. 아웃리거의 최적위치는 구조물의 전단벽, 아웃리거, 외각기둥의 요소간 강성비에 따라 변하는 값이므로, 아웃리거 시스템의 횡변위는 요소간 강성비와 아웃리거 위치 모두에 의해 영향을 받는다. 따라서 초기구조설계 단계에서 아웃리거의 위치에 대한 결정과, 각 요소간 강성비의 선택은, 전체 구조 시스템의 효율성에 상당한 영향을 미치게 된다. 하지만 아웃리거 시스템의 최적 효율을 보장하면서, 구조물의 초기 설계 시에 참고할 수 있는, 아웃리거의 최적위치와 요소간 강성비에 대한 연구는 미흡한 실정이다. 따라서 본 연구에서는 GA(genetic algorithm)을 이용하여 초기 설계 시에 참고할 수 있는 고층건물의 횡변위를 최소로 하는, 아웃리거의 최적 위치 및 요소간 강성비에 대한 연구를 진행하고자 한다. 이를 위해 시공된 예제 건물에 적용을 통해 그 효과를 검증해 본다.

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Stiffness Prediction of Spatially Reinforced Composites (공간적으로 보강된 복합재료의 강성예측)

  • 유재석;장영순;이상의;김천곤
    • Composites Research
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    • v.17 no.5
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    • pp.25-38
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    • 2004
  • In this study, the stiffness of spatially reinforced composites (SRC) are predicted by using superposition of a rod and matrix stiffnesses in an arbitrary direction. To confirm the predicted values, the material properties of SRC are measured. The predicted values from the volume average of stiffness matrix are consistent with the tested values in a rod direction, but are inconsistent in an off-rod direction while reverse is true fur the volume average of compliance matrix. Therefore, the harmony function from superposition of stiffness and compliance matrix is introduced. The predicted values from the harmony function are consistent with the tested values in both the rod and the off-rod directions.

Mode Characteristics of Spur Gears and Ball-Bearing Stiffness (볼 베어링의 강성과 스퍼기어 계의 모드 특성)

  • Park, Chan IL
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.40 no.5
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    • pp.489-495
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    • 2016
  • This study focuses on a detailed ball-bearing model for spur gears. The nonlinear ball-bearing stiffness with radial clearance is derived and calculated. The bearing stiffness is used to the 3-degree-of-freedom (DOF) spur gear system model. The mode characteristics of the gear system model are analyzed and verified by performing finite-element analysis (FEA). From the results, the bearing stiffness on the radial clearance was more sensitive under low-load conditions compared to high-load conditions. The bearing stiffness significantly affected the gear dynamics in the low-frequency region, while the mesh stiffness affected the high natural frequency.

Analytic Study on Rigid Beam Resting on Winkler Foundation (Winkler 지반상에 놓인 강성보의 해석)

  • Lee, Seung-Hyun;Kwon, Oh-Soon;Jang, In-Sung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.11
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    • pp.5300-5305
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    • 2011
  • Displacement, contact pressure and moment which are developed in rigid beam on the Winkler foundation and 2 parameter Winkler foundation were derived. It can be seen that moment distribution along with rigid beam on the Winkler foundation are regardless of spring constant and the moments calculated from assuming linear spring constant were greater than those from assuming constant spring constant. Simple calculation revealed that the maximum moment developed in the rigid beam on the 2 parameter Winkler foundation was larger than that developed in the rigid beam on the Winkler foundation.