• Journal of the Computational Structural Engineering Institute of Korea
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• v.22 no.3
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• pp.211-221
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• 2009

With recent trends of super-tallness, atypical plan shapes and zoning constructions in high-rise buildings, a structural stability of the building under construction is arising as a key issue for design and construction plan. To ensure the structural stability under construction, the differential column shortening of vertical members, the lateral displacement of tower frames, and differential settlement of raft foundation by unbalanced distributions of a tower self-weight before the completion of a lateral load resisting system should be checked by construction sequence analysis, which should be performed by systematic combinations with structural health monitoring, construction compensation program, and construction panning. This paper presents the scheme of zone-based construction sequence analysis by using the existing commercial analysis program, to check the stability of high-rise building under construction. This scheme is applied to 3-dimensional structural analysis for a real high-rise building under construction. The analysis includes real construction zoning plans and schedules as well as creep and shrinkage effects and time-dependent properties of concrete. The simplified construction sequence and assumed material properties were continuously updated with the change on construction schedule and correlations with in-situ measurement data.

• Journal of the Korea Concrete Institute
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• v.16 no.1 s.79
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• pp.36-42
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• 2004

Although steel-reinforced concrete(SRC) is widely used in a high-rise building, a methods used to predict the column shortening of SRC structural members has many problems in applying a theoretical equation which considers only the material characteristics of reinforced concrete. In this study, the degree of accuracy of the existing method calculating the column shortening of a high-rise building is examined. For this, first, the actual measurement data are chosen about the column shortening of a high-rise building established with SRC structural members. Then the column shortening of a SRC structural member is calculated through computer program. Finally, the comparison between the measurement data and the analytical ones is executed. According to this study, it can be concluded that there is little difference between the former and the latter. Therefore, the existing method can be used to evaluate the column shortening of a high-rise building using a SRC structural members.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.26 no.1
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• pp.89-97
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• 2013

With regard to complex-shaped tall buildings whose plans and constructions have been gradually on the increase, this study was aimed to analyze their structural behaviors during construction by applications of construction sequences analyses to prototype models. For twisted tall buildings, total 18 models of with three conditions of a lateral load-resisting system, a twisting angle, and a construction method were selected. A diagrid system and a braced tube system were applied as a lateral load-resisting system. For each lateral load-resisting system, three types of plan with $0^{\circ}$, $1^{\circ}$, and $2^{\circ}$ twisting angles and three construction methods with construction sequences of exterior tube and interior frame were assumed. The structural performances of tall buildings under constructions were analyzed with results of lateral displacements from construction sequence analyses. Also, construction performances of the construction period and the maximum lift weight were compared.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.22 no.4
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• pp.349-354
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• 2009

To rationally secure and maintain the safety and serviceability of a high-rise building, monitoring of structural responses of members is necessary. As such health monitoring of large-scale building structures has received growing attention by researchers in recent years. However, due to a very large number of members complexity of structural responses of a high-rise building structure, practical difficulties exist in selection of structural members to be sensored for assessment of structural safety of a structure. In this paper, a selection technique for active members for safety monitoring of a high-rise building based on displacement participation factor and strain energy density of a member is investigated.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2009.04a
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• pp.484-487
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• 2009

초고층구조물의 경우 중저층 구조물과 다르게 설계시 중력하중과 풍하중의 크기가 매우 크므로 이를 제어하는 구조물의 코어에 강성이 큰 전단벽을 설치하고 최상층에 아웃리거나 벨트트러스를 설치하는 방법을 많이 적용한다. 그리고 홍콩의 IFC와 같이 초대형기둥과 아웃리거를 설치하여 횡하중에 저항하는 구조시스템도 제시되고 있다. 이러한 초고층구조물에서 연쇄붕괴가 발생할 경우 세계무역센터의 붕괴에서 나타나듯이 상상을 초월하는 피해를 초래할 수 있다. 따라서 본 연구에서는 이러한 초고층 구조시스템의 연쇄붕괴저항능력을 Pushdown해석을 이용하여 평가하였다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.20 no.4
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• pp.453-462
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• 2007

The purpose of this study is to predict the ratios of increase in lateral stiffness for preliminary structural design of tall buildings. For this, the basic models of tall buildings with 60 stories are generated. The basic models have typical floor plan of Box or T type. And the factors for increase in lateral stiffness are selected as follows; the addition of outriggers, increase in material strength, and increase in member size of core walls, outrigger columns, and outrigger walls. Then these factors are applied to the basic models and their effects are investigated using the results of structural analysis. Finally, based on the investigation, the ratios of increase in lateral stiffness for preliminary structural design of tall buildings are proposed and applied to examples of tall building for verification of the ratios.

• Journal of the Korea Concrete Institute
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• v.20 no.2
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• pp.249-256
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• 2008

With consideration of the ongoing construction of high-rise buildings, it is becoming increasingly important to be able to accurately predict the behavior of them on the stage of design, construction and service. Even though many researchers have developed the analysis method to predict the behavior of high-rise buildings, their studies were based on the two dimensional frame structures composed of line elements such as beams and columns. Recently the high-rise buildings with flat-plate system is widely used because of its advantages. In this study a three dimensional analysis method is developed to analyze the behavior of the high-rise buildings with flat-plate system since it is difficult to model the structural systems reasonably with the existing two dimensional analysis method. The analysis method considered the construction sequence including the temporary work such as installation of form, removal of form, installation of shore, and removal of shore. Line elements were used to describe columns, beams, and shores and plate elements were used to model slabs. The creep and drying shrinkage of concrete were also considered to account for the inelastic behavior of concrete.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.186-193
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• 2003

최근 설계 및 시공되고 있는 국내 초고층 주거복합건물들의 유형과 구조설계내용들을 재점검하고 더 안전하고 경제적인 초고층 주거복합건물을 설계하기 위한 향후 과제로서 고강도 콘크리트 사용의 범용화와 구조적으로 유리한 기둥 배치계획과 횡력저항 요소로서의 Tubular 구조 및 Flat slab 등가골조 적용 등을 추가로 제시하며 또한 P.O.E의 구조적 측면에서의 도입자 인건비상승 및 후분양제도실시로 인한 공기단축등을 대비하는 철골조 아파트에 대한 지속적 상세연구가 필요하다고 판단된다. 또한 기둥의 부등축소문제, 내구성증대 및 거주성 향상문제 등도 관련 전문가들과 계속적 연구와 혐의가 필요한 것으로 생각된다.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.05a
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• pp.483-486
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• 2003

사무소는 물론 초고층 아파트에까지 철골구조에 의한 공사가 시행되고 있다. 이처럼 상업용 사무소 건물의 경우 초고층 일 수밖에 없으며, 철골구조공사는 필수적이다. 공사공정 및 잠재위험은 그만큼 증대 될 수밖에 없다.(중략)

• 건축구조
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• v.12 no.4
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• pp.80-81
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• 2005

고층화의 최대 장점은 과밀한 수평 밀집 환경을 건축물의 수직적 확장으로 과밀 현상에서 다층 보행자 시스템으로 대지의 공지를 활용하는데 있다. 이러한 초고층 건물은 특성상 건물의 강도, 강성, 안전성 등을 고려하여 설계가 이루어졌고, 이러한 특성으로 인해 비교적 건물 내의 대공간 확보와 평면의 자유를 얻기 힘들었다. 그래서, 이런 단점을 보완하기 위해서 그 대안으로 SAC조와 현수교 구조(Cable)를 제안하고자 한다.