• Title, Summary, Keyword: 건물골조시스템

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Some Critical Problems in Seismic Design of High-Rise RC Building frame Systems (고층 RC 건물골조시스템의 내진설계상 몇 가지 주요 문제점)

  • Lee Han-Seon;Jeong Seong-Wook;Ko Dong-Woo
    • Journal of the Korea Concrete Institute
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    • v.17 no.5
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    • pp.727-734
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    • 2005
  • High-rise residential buildings these days tend to adopt a building frame system as primary earthquake resisting structural system for some architectural reasons. But there exist several ambiguities in designing such building frame systems according to current codes with regards to : the effective stiffness property of RC cracked section in static and dynamic analyses, analytical model to evaluate story drift ratio, and deformation compatibility requirements of frames. The comparative study for these issues by appling KBC 2005 to a typical building frame system shows that demands of member strength and story drift ratio can be different significantly depending on engineer's Interpretation and application of code requirements. And a building frame system can be noneconomical, compared with the dual system, because of higher demands on strength or ductility in both frames and shear walls.

Lateral Resisting Behavior of Reinforced Concrete Shear Wall and Flat Plate Column (철근콘크리트 전단벽과 무량판 기둥의 횡저항 거동)

  • Kim, Tae-Wan;Min, Chan-Gi
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.14-17
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    • 2010
  • 본 논문에서는 국내에서 주상복합건물에 주로 건설되는 철근콘크리트 전단벽과 무량판 골조 기둥 시스템의 횡저항 거동을 조사, 분석하였다. 이 시스템의 내진설계 시 건물골조시스템을 적용하게 되는데 전단벽 설계는 큰 어려움이 없으나 골조의 경우 변형의 적합성을 고려해야 할 경우에 상세하고 명확한 지침이 마련되어 있지 않아 그 적용이 쉽지 않다. 이를 해결하기 위하여 예제 건물을 선정하여 기준에 따라 설계한 후 비선형정적 해석을 수행하여 철근콘크리트 전단벽과 무량판 골조 기둥의 비선형 거동을 조사하였다. 그 결과 무량판 골조 기둥의 거동은 전단벽에 종속되었고 변형의 적합성을 고려하기 위해 골조의 모멘트를 증폭하더라도 기둥의 단면 변화가 크지 않으므로 실무적으로 큰 어려움이 없는 것으로 나타났다. 다만 강도뿐만 아니라 변형 능력에 대해서도 추가적인 연구가 필요하다.

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Development of Structural Analysis and Pre-post Program for Mega Frame System (초대형 골조시스템 전용 전후처리 및 해석프로그램의 개발)

  • Kim Hyun-Su;Lee Dong-Guen
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.19 no.3
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    • pp.283-293
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    • 2006
  • Recently, various types of structural systems for skyscrapers are studied as the height and size of the building structures rapidly increase due to social and economical needs. The mega frame system among them, which is the structural system developed recently, is known as a suitable structural system for skyscrapers because this structural system has sufficient stiffness against the lateral forces by combination of mega members which consist of many columns and girders. Since the mega frame structure has significant numbers of elements and nodes, it takes tremendous times and computer memories to analyze and design the structures. Therefore, the exclusive structural analysis program for mega frame system is developed to reduce the efforts and time required for the analysis and design of mega frame structure. To this end, an efficient modelling technique using the characteristics of mega frame structures and an efficient analytical model, which uses a few DOFs selected by the user using the matrix condensation method, are developed in this study. Static and dynamic analyses are conducted using an example structure. The effectiveness and accuracy of the developed program we verified by the comparison between the results of the proposed method and the conventional method.

Approximate Analysis of Shear Wall-Frame Structure For Seismic Design (전단벽-골조 시스템의 내진설계를 위한 근사해석법)

  • Yoo, Suk-Hyung
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.23 no.2
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    • pp.99-106
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    • 2019
  • A wall-frame structure resists horizontal load by the interaction between the flexural mode of the shear wall and the shear mode of the frame, which implies that the frame deflects only by reverse bending of the columns and girders, and that the columns are axially rigid. However, as the height of frame increases the shear mode of frame changes to flexural mode, which is due to the extension and shortening of the columns. An approximate hand method for estimating horizontal deflection and member forces in high-rise shear wall-frame structures subjected to horizontal loading is presented. The method is developed from the continuous medium theory for coupled walls and expressed in non-dimensional structural parameters. It accounts for bending deformations in all individual members as well as axial deformations in the columns. The deformations calculated from the presented approximate method and matrix analysis by computer program are compared. The presented approximate method is more accurate for the taller structures.

Transient Analysis of High-rise Wall-Frame Structures with Outriggers under Seismic Load (초고층 전단벽-골조 아웃리거 구조시스템의 지진하중에 대한 시간이력해석)

  • Kim, Jin Man;Choe, Eun Hui;Park, Dae Gyu;Lee, Jae Hong
    • Journal of Korean Society of Steel Construction
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    • v.20 no.2
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    • pp.303-312
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    • 2008
  • In this paper, the seismic behavior of shear wal-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 shear-flexural cantileverwith rotational 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 wall-frame structures with and without outriggers are compared by using finite element analysis incorporated with the Newmark-${\beta}$ method. Numerical results are obtained and compared with the finite element package MIDAS. The proposed method is found to be simple and efficient, and provides reason ably accurate results in the early design stage of tall building structures.

Plastic Shear Hinges for the Seismic Design for Steel Building Structures (철골 건축구조물의 내진설계를 위한 소성 전단 힌지)

  • 이승준
    • Computational Structural Engineering
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    • v.3 no.3
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    • pp.25-29
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    • 1990
  • 고층건축구조물의 내진설계에서는 강성, 강도와 연성사이의 균형이 적절하게 유지되어야 한다. 이 글은 철골고층건물의 대표적인 구조시스템인 모멘트 골조와 가새골조의 내진거동에 대한 이해를 넓히고자 최근 연구되어온 Panel Zone과 Link Beam의 거동에 대한 결과와 설계시 유의사항을 간략하게 소개하였다.

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Structural Cost Optimization Techniques for High-rise Buildings Frame Systems Using High-strength Steels (고강도강재를 사용한 건물골조방식 초고층건물의 구조비용 최적화)

  • Seo, Ji-Hyun;Kwon, Bong-Keun;Kim, Sang-Bum;Park, Hyo-Seon
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.22 no.1
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    • pp.53-63
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    • 2009
  • Use of high-strength steel members in building of high-rise buildings and large scale structures is expected to increase the effectiveness of structural design by reducing the weight and cost of structures. So far, high-strength steel members have been used in a very limited way because it is hard to select the proper strengths of steel members in a systematic way with the consideration of the structural cost. In this paper, therefore, a structural optimization technique based on Genetic algorithm is developed for effective use of high-strength steel members in structural design of high-rise buildings with the form of building frame system. The stability and efficiency of the technique is evaluated by using to a 35-story building. As a result, a stable and reliable optimal solution was obtained with a difference of 2.63% between individual and mean optimal structural costs.

Inelastic Dynamic Demands of a RC Special Moment Frame Building (철근 콘크리트 특수 모멘트 골조 건물의 비탄성 동적 요구값)

  • Kim, Tae-Wan
    • Journal of the Earthquake Engineering Society of Korea
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    • v.9 no.5
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    • pp.11-19
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    • 2005
  • Seismic design of a building is usually performed by using the linear static procedure. However, the actual behavior of the building subjected to earthquake is inelastic and dynamic in nature. Therefore, inelastic dynamic analysis is required to evaluate the safety of the structure designed by the current design codes. For the validation, a RC special moment resisting frame building was chosen and designed by IBC 2003 representing new codes. Maximum plastic rotation and dissipated energy of some selected members were calculated for examining if the inelastic behavior of the building follows the intention of the code, and drift demand were calculated as well for checking if the building well satisfies the design drift limit. In addition, the effect of including internal moment resisting frames (non lateral resisting system) on analyses results was investigated. As a result of this study, the building designed by IBC 2003 showed the inelastic behavior intended in the code and satisfied the design drift limit. Furthermore, the internal moment resisting frames should be included in the analytical model as they affect the results of seismic analyses significantly.

Seismic Performance Evaluation of a RC Special Moment Frame Building (철근 콘크리트 특수 모멘트 골조 건물의 내진 성능 평가)

  • Kim, Tae-Wan;Kim, Jin-Koo
    • Journal of the Earthquake Engineering Society of Korea
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    • v.11 no.2
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    • pp.39-45
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    • 2007
  • In this study the probability and the reliability-based seismic performance evaluation procedure proposed in the FEMA-355F was applied to a reinforced concrete moment frame building. For the FEMA procedure, which was originally developed for steel moment frame structures, to be applied to other structural systems, the capacity should be re-defined and the factors reflecting the uncertainties related to capacity and demand need to be determined. To perform the evaluation procedure a prototype building was designed per IBC 2003, and inelastic dynamic analyses were conducted applying site-specific ground motions to determine the parameters for performance evaluation. According to the analysis results, distribution of the determined capacities turned out to be relative]y smaller than that of the demands, which showed that the defined capacity was reasonable. It was also shown that the prototype building satisfied the target performance since the determined confidence levels exceeded the otjectives for both local and global collapses.

Seismic Retrofit of Old Reinforced Concrete Buildings (노후 RC 건물의 내진 보강)

  • Huynh, Chanh Trung;Park, Jong-Yeol;Kim, Jin-Koo
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.150-153
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    • 2010
  • 본 논문에서는 비내진 설계된 철근콘크리트 골조로 이루어진 저층의 노후공동주택의 내진성능을 향상시키기 위한 구조물의 보강방법에 대해 연구하였다. 이를 위하여 비선형 정적 해석과 시간 이력 해석을 수행하여 추가되는 철골 모멘트골조와 가새의 내진보강 효과를 검증하였다. 해석결과에 따르면 $H150{\times}150{\times}6{\times}8$로 구성된 철골 모멘트골조는 탄성구간에서는 하중의 약 1%, 구조물이 항복한 이후, 최대 3.5%까지 하중을 부담하여 자체적으로 지진하중에 대한 저항 성능은 크지 않았다. 그러나 철골 모멘트골조와 가새를 동시에 사용함으로써 접합부의 조기 파괴를 방지하고 구조물의 내진성능을 큰 폭으로 증진시킬 수 있는 것으로 나타났다.

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