• Title/Summary/Keyword: Outrigger System

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Lateral Behavior of Vierendeel Outrigger System in High-rise Building (초고층 비렌딜 아웃리거 구조시스템의 수평거동)

  • Kim, Hyong-Kee
    • Journal of the Architectural Institute of Korea
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    • v.37 no.10
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    • pp.199-210
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    • 2021
  • The study aimed to understand the lateral behavior of vierendeel outrigger system in high-rise building. For this goal, a structure analysis and design of 60 stories building was performed by using MIDAS-Gen. And the main factors of this research were the types of outrigger system, the stiffness of outrigger and the location of outrigger system. Based on the analysis results, we analyzed and studied the lateral behavior of structure members such as slab, outrigger and exterior columns in vierendeel and general outrigger system. The study results showed that the types and the stiffness of outrigger system had an any influences on lateral behavior in vierendeel outrigger system of tall building. Also the results of analysis research can be very useful in getting the significant engineering materials for the structural design of vierendeel outrigger system in high-rise building.

The Evolution of Outrigger System in Tall Buildings

  • Ho, Goman W.M.
    • International Journal of High-Rise Buildings
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    • v.5 no.1
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    • pp.21-30
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    • 2016
  • The structural efficiency of tall buildings heavily depends on the lateral stiffness and resistance capacity. Among those structural systems for tall buildings, outrigger system is one of the most common and efficient systems especially for those with relatively regular floor plan. The use of outriggers in building structures can be traced back from early 50 from the concept of deep beams. With the rise of building height, deep beams become concrete walls or now in a form of at least one story high steel truss type of outriggers. Because of the widened choice in material to be adopted in outriggers, the form and even the objective of using outrigger system is also changing. In the past, outrigger systems is only used to provide additional stiffness to reduce drift and deflection. New applications for outrigger systems now move to provide additional damping to reduce wind load and acceleration, and also could be used as structural fuse to protect the building under a severe earthquake condition. Besides analysis and member design, construction issue of outrigger systems is somehow cannot be separated. Axial shortening effect between core and perimeter structure is unavoidable. This paper presents a state-of-the-art review on the outrigger system in tall buildings including development history and applications of outrigger systems in tall buildings. The concept of outrigger system, optimum topology, and design and construction consideration will also be discussed and presented.

Investigation of Optimal Location for Two-Outrigger System in High-rise Building (두개의 아웃리거가 설치된 초고층건물에서 최적 아웃리거 구조 위치에 대한 탐색)

  • Kim, Hyong-Kee
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.30 no.6
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    • pp.3-10
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    • 2014
  • This research aimed to grasp the optimal location for two-outrigger system in high-rise building by using MIDAS-Gen. In this study, the main variables of structural analysis research were the outrigger location, the outrigger spacing and the stiffness of primary structural members such as outrigger systems, exterior columns connected in outrigger system, shear walls and frames. For the purpose of investigating the optimal position for two-outrigger system in tall building, we compared and examined the lateral displacement in top floor of 80 stories high-rise building. In the results of this analysis research, it is showed that the outrigger location, the outrigger spacing and the stiffness of primary structural members such as outrigger systems, exterior columns connected in outrigger system and shear wall had an impact on the optimal location of two-outrigger system. Furthermore, it is indicated that the study results can provide assistance in getting the structural design data for searching the optimal location of two-outrigger system in tall building.

Comparative Analysis on Influence of Structure Elements on Optimal Location of One-Outrigger System (단일 아웃리거 구조시스템의 최적위치에 미치는 구조요소의 영향에 대한 비교분석)

  • Kim, Hyong-Kee
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.2
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    • pp.22-32
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    • 2015
  • This study intended to analyze an influence of the structure elements on the optimal location for one-outrigger system in tall building by using MIDAS-Gen. In this investigation, the analysis parameters were the outrigger position and the stiffness of main structure elements such as shear walls, outrigger systems, exterior columns connected in outrigger system and frames not to be connected in outrigger system. For the objective of finding out the optimal location for one-outrigger system in high-rise building, we studied the lateral displacement in top level of 80 stories building. The results of this study indicated that the outrigger location and the stiffness of main structure elements such as shear walls, outrigger systems, exterior columns connected in outrigger system and frames not to be connected in outrigger system had an influence on the optimal location of one-outrigger system. In addition, it is showed that the research results can be very useful in obtaining the structure design data for looking for the optimal location of one-outrigger system in high-rise building.

Analysis of Lateral Behavior in Core and Offset Outrigger System (코어 및 오프셋 아웃리거 구조시스템의 수평거동에 대한 분석)

  • Kim, Hyong-Kee
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.25 no.4
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    • pp.1-11
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    • 2021
  • The research intended to understand the lateral behavior in core and offset outrigger system. To achieve this goal, a structural analysis and design of 70 stories building was carried out by making use of MIDAS-Gen. And the primary parameters of this analysis were the stiffness of outrigger and the location of outrigger in plan. On the basis of the analysis results, we analyzed the lateral behavior of structural elements such as slab, outrigger and exterior columns in core and offset outrigger. In this analysis research, it is indicated that the stiffness of outrigger and the outrigger location in plan had an any impact on lateral behavior in outrigger system of tall building. Specially, slab stresses in core outrigger system were highly distributed in the slab near the outrigger system to connect shear walls and exterior columns while slab stresses in offset outrigger system were highly distributed in the slab between the outrigger system and shear walls. Also the study results can be of significant help to obtaining the engineering data for the reasonable structure design of the high-rise outrigger system.

Performance Evaluation of Outrigger System in Tall Buildings with Eccentric Core (편심코어를 가진 초고층 건축물의 아웃리거 시스템 성능 평가)

  • Park, Ji-Hyeong;Kim, Tae-Ho;Kim, Ook-Jong;Lee, Do-Bum
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.561-566
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    • 2009
  • The outrigger system with a core is widely used for lateral load resisting system of tall building. Recently, structural systems in tall building are adopted to eccentric core and offset outrigger or one-armed outrigger system by trends in planning buildings of irregular type. Therefore, the performance of outrigger system with eccentric core in tall building is evaluated by 50-stories examples which are analyzed for variables such as layout of core and outrigger, arm length of outrigger and depth of outrigger and belt wall.

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Optimal Design of Outrigger Damper using Multi-objective Genetic Algorithm (다목적 유전자 알고리즘을 이용한 아웃리거 댐퍼의 최적설계)

  • Kim, Hyun-Su;Yoon, Sung-Wook;Kang, Joo-Won
    • Journal of Korean Association for Spatial Structures
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    • v.14 no.4
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    • pp.97-104
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    • 2014
  • Recently, a concept of damped outrigger system has been proposed for tall buildings. Structural characteristics and design method of this system were not sufficiently investigated to date. In this study, control performance of damped outrigger system for building structures subjected to seismic excitations has been investigated. And optimal design method of damped outrigger system has been proposed using multi-objective genetic algorithm. To this end, a simplified numerical model of damped outrigger system has been developed. State-space equation formulation proposed in previous research was used to make a numerical model. Multi-objective genetic algorithms has been employed for optimal design of the stiffness and damping parameters of the outrigger damper. Based on numerical analyses, it has been shown that the damped outrigger system control dynamic responses of the tall buildings subjected to earthquake excitations in comparison with a traditional outrigger system.

Modified Proposal for Optimal Location of Offset Outrigger System in High-rise Building (초고층 오프셋 아웃리거 구조의 최적 위치에 대한 수정제안)

  • Kim, Hyong-Kee
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.24 no.5
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    • pp.37-44
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    • 2020
  • This research aimed to propose the more proper equation than the leading and existing equations to predict the optimum location of offset outrigger. In this study, a 79 existing models of offset outrigger system were examined. And the key factors in the existing offset outrigger models were the stiffness of shear wall and offset outrigger system, the stiffness of exterior column connected in offset outrigger, the frame stiffness, the ratios of lateral stiffness of frame in shear wall-frame structures, and all that. This paper proposed the modified equation of predicting the optimal location of offset outrigger system. Additionally, the findings of this study provided the important structure engineering materials of the optimal offset outrigger position in tall building.

Stiffness-Based Optimization for the Lateral Drift Control of Outrigger System (아웃리거시스템의 횡변위제어를 위한 강성최적화 기법)

  • Lee, Han-Joo;Park, Young-Sin;Nam, Kyung-Yun;Lee, Seong-Su;Shin, Hyo-Bum;Kim, Ho-Soo
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2008.04a
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    • pp.210-215
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    • 2008
  • This study presents an effective stiffness-based optimal technique to control quantitatively lateral drift and evaluates the structural behavior characteristics and efficiency for tall outrigger system subject to lateral loads. To this end, displacement sensitivity depending on behavior characteristics of outrigger system is established and approximation concept that can efficiently solve large scale problems is introduced. Specifically, under the 'constant-shape' assumption, resizing technique of member is developed. Two types of 60 story frameworks are presented to illustrate the features of the quantitative lateral drift control technique proposed in this study.

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Optimal Design of Smart Outrigger Damper for Multiple Control of Wind and Seismic Responses (풍응답과 지진응답의 다중제어를 위한 스마트 아웃리거 댐퍼의 최적설계)

  • Kim, Hyun-Su;Kang, Joo-Won
    • Journal of Korean Association for Spatial Structures
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    • v.16 no.3
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    • pp.79-88
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    • 2016
  • An outrigger damper system has been proposed to reduce dynamic responses of tall buildings. In previous studies, an outrigger damper system was optimally designed to decrease a wind-induced or earthquake-induced dynamic response. When an outrigger damper system is optimally designed for wind excitation, its control performance for seismic excitation deteriorates. Therefore, a smart outrigger damper system is proposed in this study to make a control system that can simultaneously reduce both wind and seismic responses. A smart outrigger system is made up of MR (Magnetorheological) dampers. A fuzzy logic control algorithm (FLC) was used to generate command voltages sent for smart outrigger damper system and the FLC was optimized by genetic algorithm. This study shows that the smart outrigger system can provide good control performance for reduction of both wind and earthquake responses compared to the general outrigger system.