• Title/Summary/Keyword: slit damper

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Seismic Performance Evaluation of Structures Retrofitted with Viscoelastic-Slit Hybrid Dampers (점탄성-슬릿 복합댐퍼로 보강된 건물의 내진성능평가)

  • Kim, Minsung;Xu, Zhaodong;Kim, Jinkoo
    • Journal of the Earthquake Engineering Society of Korea
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    • v.22 no.7
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    • pp.361-367
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    • 2018
  • This study investigates the seismic performance of a hybrid seismic energy dissipation device composed of a viscoelastic damper and a steel slit damper connected in parallel. A moment-framed structure is designed without seismic load and is retrofitted with the hybrid dampers. The model structure is transformed into an equivalent simplified system to find out optimum story-wise damper distribution pattern using genetic algorithm. The effectiveness of the hybrid damper is investigated by fragility analysis of the structure with and without the dampers. The analysis results show that after seismic retrofit the probability of reaching damage states, especially the complete damage state, of the structure turn out to be significantly reduced.

A Study on Seismic Performance Evaluation of RC Frame Retrofitted by Masonry Infill Wall and Steel Damper (조적채움벽 및 강재댐퍼 보강 RC 골조의 내진성능 평가에 관한 연구)

  • Lee Jung Han;Yang Won Jik;Kang Dae Eon;Song Han Beam;Oh Sang Hoon;Yi Waon Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.129-132
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    • 2005
  • The primary purpose of this investigation is to find out the shear behavior and the shear capacity of RC bare frames, brick-infilled RC frames, and damper-retrofitted RC frames and to evaluate the average shear strength of brick--infill wall. The main variables art the absence of brick infill wall and steel plate slit damper. The test results show that the shear capacity of specimen IF-DR is 2.8 times as high as that of the specimen BF and it presents the fact that the retrofitting effect and the possibility of RC frame reuse with changing the slit damper is verified. And the average shear strength of the brick infill wall is figured to be at $5.0 kgf/cm^2$.

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Seismic performance evaluation of moment frames with slit-friction hybrid dampers

  • Lee, Joonho;Kim, Jinkoo
    • Earthquakes and Structures
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    • v.9 no.6
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    • pp.1291-1311
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    • 2015
  • This study investigates the seismic energy dissipation capacity of a hybrid passive damper composed of a friction and a hysteretic slit damper. The capacity of the hybrid device required to satisfy a given target performance of a reinforced concrete moment resisting frame designed with reduced design base shear is determined based on the ASCE/SEI 7-10 process, and the seismic performances of the structures designed without and with the hybrid dampers are verified by nonlinear dynamic analyses. Fragility analysis is carried out to investigate the probability of a specified limit state to be reached. The analysis results show that in the structure with hybrid dampers the residual displacements are generally reduced and the dissipated inelastic energy is mostly concentrated on the dampers. At the Moderate to Extensive damage states the fragility turned out to be smallest in the structure with the hybrid dampers.

Full-scale tests of two-story RC frames retrofitted with steel plate multi-slit dampers

  • Javidan, Mohammad Mahdi;Nasab, Mohammad Seddiq Eskandari;Kim, Jinkoo
    • Steel and Composite Structures
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    • v.39 no.5
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    • pp.645-664
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    • 2021
  • There is a growing need of seismic retrofit of existing non-seismically designed structures in Korea after the 2016 Gyeongju and 2017 Pohang earthquakes, especially school buildings which experienced extensive damage during those two earthquakes. To this end, a steel multi-slit damper (MSD) was developed in this research which can be installed inside of partition walls of school buildings. Full-scale two-story RC frames were tested with and without the proposed dampers. The frames had structural details similar to school buildings constructed in the 1980s in Korea. The details of the experiments were described in detail, and the test results were validated using the analysis model. The developed seismic retrofit strategy was applied to a case study school building structure, and its seismic performance was evaluated before and after retrofit using the MSD. The results show that the developed retrofit strategy can improve the seismic performance of the structure to satisfy a given target performance level.

Hysteretic Behaviors of Metallic Dampers with the Various Slit Shape (슬릿형상에 따른 강재댐퍼의 이력거동)

  • Lee, Hyun Ho;Kim, Seh Il
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.15 no.5
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    • pp.199-208
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    • 2011
  • The purpose of this study is to evaluate of the strength and deformation capacity of metallic dampers with the variable slit shape. For this purpose, 12 metallic damper specimens were prepared and shear testing was performed. According to the test results, the S shaped metallic damper with the strut height of 200mm and angle of $60^{\circ}$ shows better hysteretic performance than any other specimens. By making a comparison between the yield strength in test and the proposed strength formula, test results shows larger yield strength than calculation method.

Experimental Structural Performance Evaluation of Hybrid Damper Combining with High Damping Rubber and Steel Slit (고감쇠고무와 강재슬릿이 결합된 하이브리드 댐퍼의 실험적 구조성능평가)

  • Lee, Joon-Ho;Park, Byung-Tae;Kim, Yu-Seong
    • Journal of Korean Association for Spatial Structures
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    • v.22 no.4
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    • pp.23-30
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    • 2022
  • It is effective to apply hybrid damping device that combine separate damping device to cope with various seismic load. In this study, HRS hybrid damper(hybrid rubber slit damper) in which high damping rubber and steel slit plate are combined in parallel was proposed and structural performance tests were performed to review the suitability for seismic performance. Cyclic Loading tests were performed in accordance with criteria presented in KDS 41 17 00 and MOE 2019. As a result of the test, the criteria of KDS 41 17 00 and MOE2019 was satisfied, and the amount of energy dissipation increased due to the shear deformation of the high-damping rubber at low displacement. Result of performing the RC frame test, the allowable story drift ratio was satisfied, and the amount of energy dissipation increased in the reinforced specimen compared to the non-reinforced specimen.

Analysis of Design Parameter Characteristics for Automobile Passive Dampers (승용차용 Passive Damper의 설계변수에 관한 특성 분석)

  • Noh, DaeKyung;Jang, JooSup;Seo, WonJin
    • Tribology and Lubricants
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    • v.30 no.1
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    • pp.46-51
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    • 2014
  • In this study, we attempted to characterize the physical meaning of the design parameters used for automobile passive dampers by considering the slit, disc, and hole, which influence the pressure characteristics. We also analyzed the change in the pressure characteristics when mixing various slits and discs. Finally, we used a computer simulation to implement lag according to nitrogen gas and analyzed the dependence of frequency on the nitrogen gas pressure.

Development of Displacement Amplification Damping System for the Remodeling Buildings (리모델링 건축물을 위한 변위증폭형 제진시스템 개발)

  • Park, Young-Mi;Kim, Hye Won;Park, Ki-Hong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.10a
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    • pp.11-12
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    • 2016
  • Buildings which was constructed before 1988 were not satisfied seismic design code. Thus, most of these buildings have to retrofit for remodeling. This study proposed the steel slit damper system with displacement-amplification device. It could maximize the effectiveness of a damper system in controlling seismic response of a building by amplifying story drift induced to damper. In this study, the proposed system was verified the effect of displacement-amplification using the analytical and experimental study. From the analysis and experiment, it was found that the propsed damping system showed a stable hysteric behavior with excellent energy dissipation capacity. Therefore the proposed system will make a good seismic performance and economical benefits.

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Seismic Resistance Response of Railway Station Building Retrofitted by Metallic Dampers (강재댐퍼를 적용한 역사 건물의 내진 응답)

  • Lee, Hyun-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.2
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    • pp.82-88
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    • 2010
  • The purpose of this research is a seismic capacity evaluation and strengthening of existing railway station buildings, which were constructed before the seismic design code activated. The seismic capacity of 2nd story RC station building is evaluated by using nonlinear time-history analysis. Analysis results are checked by story drift ratio and story shear, which are described in design code. As a result, the story shears are exceeding the base shear of the design code, the appropriate seismic strengthening methods are needed. To improve the seismic capacity, metallic dampers are used. Evaluation parameters are metallic damper shape and damper installation methods. Dampers are installed in four places in X and Y directions of station buildings. By reviewing of time-history analysis results, the metallic damper, which is installed inverted K-brace type, shows a better seismic performance than other damper shape and installation methods.

Structural Behavior of Beam-to-Column Connections with Elasto-Plastic Hysteretic Dampers (탄소성 이력댐퍼를 구비한 접합부의 거동)

  • Oh, Sang-Hoon;Ryu, Hong-Sik;Kim, Young-Ju
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2005.03a
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    • pp.552-559
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    • 2005
  • The resistance of a structure against an earthquake is related to its ability to absorb the seismic input energy. The development of devices for dissipating the seismically induced energy on the structure is a subject that is receiving large attentionin the field of earthquake engineering. One example of these devices is the steel plate with slits. In this paper, a connection with a slit-type steel plate damper installed at each ends of wide-flange section beam, as an energy absorption element, was proposed. A series of experiment was performed to investigate their behavior and structural characteristic. The main parameters were the aspect ratio of the struts in slit plates, thickness of the struts and height of the vertical plates. Test results indicated that most of the energy was absorbed by plastic deformation of slit plate dampers.

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