• Title/Summary/Keyword: 강재 이력댐퍼

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Experimental Study on the Characteristics of Steel Hysteretic Dampers with E-Shape Elements (E-Shape 강재이력댐퍼의 거동 분석)

  • 김인배;강형택;이민구;서주원
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2003.03a
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    • pp.457-464
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    • 2003
  • 최근 교량의 건설에 있어서 내진설계가 주요문제로 부각되면서, 구조물의 진동응답을 제어 하는 갖가지 형태의 진동제어 기법이 적용되고 있다. LRB(Lead Rebbe. Bearing), LUD(Lock Up Device)등 다양한 지진격리장치가 설계에 적용되고 있으며 특히, 설계변경 .내진보수보강과 같이 제약 조건이 있는 상황에서 유용한 면진방법으로 사용되고 있다. 이러한 지진격리장치는 기본적인 설계특성인 수평강성, 감쇠성능에 대한 검증을 필요로 한다. 특히, 지진과 같은 동적하중에 대하여 하중속도, 수직력, 변형률 등에 대한 의존성과 내구성의 검토가 필요하며 유사장치에 대하여 검증실험기준의 정립이 진행 중에 있다. 강재이력댐퍼인 E-Shape 댐퍼는 지진격리장치로서 교각의 고정단에 교좌장치로 설치되어 상시에는 탄성영역 내에서 거동하는 고정단의 역할을 하다가, 지진발생시에는 E-Shape형태의 강재댐퍼가 소성변형을 통한 이력거동으로 에너지 소산기능을 가진 교좌장치이다. 최근 LRB에 대하여는 다양한 특성실험이 수행되고 있으나 상대적으로 강재이력댐퍼에 대하여는 이러한 검증실험이 수반되지 않고 사용되고 있다. 본 실험연구에서는 E-Shape 강재이력댐퍼에 대하여 연직하중, 수평변형률, 수평속도에 패한 동적특성을 평가함으로서 강재이력댐퍼를 이용한 지진격리설계의 타당성과 면진성능을 평가해 보았다.

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Structural Performance Evaluations of Steel Hysteretic Damper in Series for High-Rise Shear Wall System (고층 전단벽시스템 적용을 위한 직렬 연결형 강재이력댐퍼의 구조성능평가)

  • Oh, Sang-Hoon;Choi, Kwang-Yong;Ryu, Hong-Sik
    • Journal of Korean Society of Steel Construction
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    • v.24 no.4
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    • pp.371-382
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    • 2012
  • Existing shear wall system may cause ductility fallen to the structure which it is on because relatively weak concrete core would easy to be damaged. In this study, steel hysteresis dampers whose stiffness is higher than existing coupling beam and whose strength is easy to change depending on design load was used in coupling beam. The steel hysteresis damper was proposed for the shape connected in double in series, from this, several static test were conducted to verify structural performance of the damper. FEM analysis was also performed, then design equation were suggested.

Structural Behavior of Joints between the Hysteretic Steel Damper Connector and RC Wall Depending on Connection Details (강재판형 이력댐퍼 연결부재와 RC벽체의 접합상세에 따른 구조거동)

  • Kang, In-Seok;Hur, Moo-Won
    • Journal of the Korea Concrete Institute
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    • v.24 no.6
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    • pp.737-744
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    • 2012
  • Hysteretic steel damper has been applied mainly to steel buildings. However, the usage in RC buildings is rapidly increasing recently. In order to apply the steel hysteretic damper in RC buildings, supporting elements of the damper should have sufficient strength and stiffness suitable for transferring damper forces to beams and walls. But due to the inevitable damage in reinforced concrete elements due to cracking, identification of the load transfer mechanism from damper to supporting element and hysteretic characteristics of the supporting element are extremely important in evaluating the damper behavior. Experiments were carried out on connection details between RC walls and supporting elements of the steel plate typed damper such as EaSy damper. The test results showed that fracture patterns of all specimens were almost identical except in the crack number and pattern associated with shear loading condition. Among the specimens, HD-3 shoed a well distributed cracks patterns along with good performance with respect to energy dissipation capacity, stiffness deterioration, and strength degradation.

A Study on Base Isolation Performance and Phenomenological Model of E-Shape Steel Hysteretic Damper (E-Shape 강재이력댐퍼의 수치모델과 기초격리구조물의 지진응답)

  • Hwang, Inho;Ju, Minkwan;Sim, Jongsung;Lee, Jong Seh
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.5A
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    • pp.685-690
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    • 2008
  • Recently, as large structures become lighter and more flexible, the necessity of structural control for reducing excessive displacement and acceleration due to seismic excitation is increased. As a means to minimize seismic damages, various base isolation systems are adopted or considered for adoption. In this study, a base isolation system using hysteretic damper is shown to effectively protect structures against earthquakes. A mechanical model is determined that can effectively portray the behavior of a typical E-shape device. Comparison with experimental results for a hysteretic damper indicates that the model is accurate over a wide range of operating conditions and adequate for analysis. The seismic performance of hysteretic dampers are studied and compared with the conventional systems as a base isolation system. A five-story building is modeled and the seismic performance of the systems subjected to three different earthquake is compared. The results show that the hysteretic damper system can provide superior protection than the other systems for a wide range of ground motions.

Hysteretic Behavior of Steel Slit Damper (강재 슬릿댐퍼의 이력특성)

  • Choi, Ki-Sun;Son, Young-Seon;Cho, Hae-Jin;You, Young-Chan;Kim, Keung-Hwan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.65-66
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    • 2009
  • An experiment was carried out to evaluate energy dissipation capacity and hysteretic behavior of the steel slit damper. From the experiment, it was found that the steel slit damper showed a stable hysteretic behavior with excellent energy dissipation capacity.

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An Experimental Study on the Seismic Performance of RC Frames with Steel Dampers (강재댐퍼로 보강된 철근콘크리트 골조의 내진성능 실험 연구)

  • Park, Ji-Young
    • Land and Housing Review
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    • v.1 no.1
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    • pp.43-50
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    • 2010
  • In this study, the influences of steel dampers on the behavior of RC frames were investigated using the experimental approach to suggest the installation methods of steel dampers using K-barces. The performances of RC frames with dampers can be evaluated by superposition the load-displacement curves of RC frames and steel dampers with regard to the influences of K-braces. Three specimens are tested to investigate the cyclic behavior of RC frames with dampers. The performances of RC frames with dampers with respect to strength, rigidity, and hysteretic performance are examined. It was found that test results demonstrates the effect of seismic retrofit on RC frames with steel dampers(D-RCF-KBSF, D-RCF-KBSP) compared with RC frames(N-RCF). An approximate design curves may not be good agreement with those of the tests, it is conservative enough so that you can design of RC frames with steel damper with regard to the influences of K-braces.

Hybrid Damper of Steel Strip and Spring (강재 스트립과 스프링의 혼합형 댐퍼)

  • Kim, Dong-Baek;Lee, In-Duk;Lee, Jae-Won;Kim, Jong-Hoon
    • Proceedings of the Korean Society of Disaster Information Conference
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    • 2022.10a
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    • pp.299-300
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    • 2022
  • 구조물의 내진보강방법 중에서 가장 널리 이용되는 방법인 강재 이력형 감쇠장치는 수평하중에 대한 응력-변위 곡선을 이용하여 지진 에너지를 소산시키는 방법인데, 이 경우 편심하중 등에 의해서 부재가 면 외 방향으로 거동하여 응력-변위곡선이 불규칙하여 그 결과의 신뢰성이 떨어지는 경우가 있다. 이러한 형상을 방지하기 위해서는 별도의 채널(Channel)을 시공하는 불편함을 감수해야 하며, 또한 수평력이 반복적으로 작용할 때 그 효과를 장담할 수 없는 문제점이 있다. 본 연구에서는 강재 스트립과 스프링을 결합한 댐퍼를 고안하여 스프링은 탄성변형을, 강재 스트립은 소성변형을 받게 하는 혼합형 댐퍼를 개발하고자한다. 여기서, 스프링은 복원력으로 작용하여 반복하중에 대한 저항성을 키우고 강재 스트립의 하중변위 곡선을 규칙적으로 하는 역할을 수행하게 되며 에너지 소산량을 계산할 때 편리함과 정확도를 높이고자 한다. 강재 스트립의 폭과 길이는 일정하지만 두께를 변화시켜서 5종류를 선택하였으며, 댐퍼 1개당 3개의 스트립을 정삼각형 형태로 배치하고 그 중심에 상당한 강성을 갖는 스프링을 갖는 형태로 제작하였다. 댐퍼 시험체는 5개를 제작한 후, 이 댐퍼를 구조물에 배치하였을 때의 지진에 대한 에너지 소산량과 부재력을 검토하여 댐퍼의 안전성(Safety)를 검증하고자 한다.

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Mitigating Seismic Response of RC Framed Apartment Building Using Isotropic Hysteretic Steel Dampers (등방성 이력형 강재댐퍼를 이용한 RC 라멘조 아파트건물의 지진응답 개선)

  • Chun, Young-Soo;Bang, Jong-Dae
    • Land and Housing Review
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    • v.5 no.2
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    • pp.107-114
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    • 2014
  • Passive energy dissipation systems for seismic applications have been under development for a number of years with a rapid increase in implementations starting in the mid-1990s in many countries. A metallic hysteretic damper has most commonly been used for seismic protection of structures in domestic area because they present high energy-dissipation potential at relatively low cost and easy to install and maintain. This paper presents an analytical case study of the effectiveness of isotropic hysteretic metallic damper(IHMD) called Kagome as a passive dissipative device in reducing structural response during seismic excitation. An eighteen-story RC framed apartment building is studied with and without IHMD. Results demonstrate the feasibility of these techniques for seismic mitigation. The inclusion of supplemental passive energy dissipation devices in the form of IHMD proved to be a very effective method for significantly reducing the seismic response of the building investigated.

Experimental Study on Structural Performance of Steel Slit Damper According to Restrained Out-of-plane Deformation (면외변형 구속에 따른 강재슬릿댐퍼의 구조성능에 관한 실험적 연구)

  • Jin-Woo Kim;U-Jin Kwon;Kwang-Yong Choi;Young-Ju Kim;Hae-Yong Park
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.27 no.1
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    • pp.86-94
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    • 2023
  • In this study, a supplementary detail capable of restraining out-of-plane deformation was proposed for steel slit dampers, and a constant amplitude cyclic loading test was performed with the application of the proposed detail and the shape ratio of the damper as variables. Repeated hysteresis and cumulative plastic deformation according to the test results were analyzed. Repeated hysteresis of the slit damper with the proposed detail showed a stable spindle-shaped hysteresis within the set variable range, and no out-of-plane deformation of the damper was observed until ultimate state. It was confirmed that the restraining panel effect through the application of the proposed details is effective in terms of both the strength and deformation capacity of the damper. In addition, experimental parameters for the fatigue curve evaluation of slit dampers were derived in this study. Based on the results, it is judged that quantitative comparison of structural performance with various types of seismic devices will be possible in the future.

Metallic Damper Shape and Cyclic Behavior for the Seismic Capacity Improvement of Building Structures (건축구조물의 내진성능 향상을 위한 강재댐퍼 형상 및 이력 거동)

  • Lee, Hyun-Ho;Kim, Seh-Il
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.3
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    • pp.123-130
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    • 2010
  • The aim of this paper is a seismic performance evaluation of metallic damper devices which are efficient in workability and installation process. For this V shape and S shape dampers is considered. The strut figures of dampers are V shape and S shape and, the research parameters are strut height and angle of the dampers. ABAQUS program is used for nonlinear finite element analysis. The analysis is performed with the hysteretic curve that has maximum displacement with 50mm and has increased progressive. As a results of evaluating the yield strength, maximum strength and energy dissipation capacity of each device, V and S shape have a good strength capacity and the devices with strut angle $60^{\circ}$ and strut height 140 and 200mm are evaluated stable in seismic behaviors. The response of S shape is more efficient than that of V shape. In the yield strength estimation process, proposed formula can not estimate the yield strength of V and S shape dampers. Even though, the formula can not consider the variation of strut heights and strut angles. Finally the S shape damper is recommended in seismic performance than V shape damper.