• Title/Summary/Keyword: Pseudo dynamic earthquake response test

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Pseudo Dynamic Earthquake Response Tests on Steel Frames with Slit Plate Damper (슬릿형 댐퍼를 부착한 철골조 시스템의 가동적 지진응답실험)

  • Lee, Seung-Jae;Park, Jae-Seong;Oh, Sang-Hoon;Ryu, Hong-Sik
    • Proceeding of KASS Symposium
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    • 2008.05a
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    • pp.145-150
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    • 2008
  • The purpose of this study is to propose damper system which is easy to design, which can ensure against risks, and to verify earthquake response characteristics. For this study, the pseudo dynamic earthquake response tests carried out for steel frames with two types of seismic and vibration control device. As a result, in case of using the slit plate damper as a vibration control device proposed by this study, the damper having higher stiffness than main-structure turned to the state of plasticity by little displacement has been proved to be able to absorb earthquake energy.

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A Study on the Earthquake Response Characteristics of Steel Frames with Metallic Damper (강재 댐퍼를 부착한 철골조의 지진응답특성에 관한 연구)

  • Lee, Seung-Jae;Park, Jae-Seong;Oh, Sang-Hoon
    • Journal of Korean Association for Spatial Structures
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    • v.11 no.2
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    • pp.119-127
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    • 2011
  • The purpose of this study is to propose damper system which is easy to design, which can ensure against risks, and to verify earthquake response characteristics. For this study, the pseudo dynamic earthquake response tests carried out for steel frames with metallic damper. As a result, in case of using the metallic damper as a vibration control device proposed by this study, the damper having higher stiffness than main-structure turned to the state of plasticity by little displacement has been proved to be able to absorb earthquake energy.

On-line Tests on Collapse Mode Controlled Steel Frame (붕괴모드 컨트롤형 철골조 시스템의 온라인 지진응답실험)

  • Lee, Seung-Jae;Oh, Sang-Hoon
    • Journal of Korean Association for Spatial Structures
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    • v.9 no.1
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    • pp.47-52
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    • 2009
  • In this study, it is demonstrated by a pseudo dynamic earthquake response tests that combination of semi-rigid partial-strength using the high performance-high strength bolts and inter-story hysteretic damper system creates a fairly good structural system that satisfies not only the serviceability requirement under moderate earthquakes but unexpected failure of damper system.

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Correction of Pseudo-Dynamic Test by Equivalent Energy Compensation (등가에너지 보상을 통한 유사동적 실험의 보정)

  • Kim, Nam Sik;Lee, Sang Soon;Chung, Woo Jung;Lee, Dong Guen
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.12 no.4_1
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    • pp.77-85
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    • 1992
  • The Pseudo-dynamic test is a new experimental technique for simulating the earthquake response of structures or structural components in the time domain. It is especially efficient for testing specimens that are too large, heavy or strong to be tested on a shaking table. But, in general, the responses obtained in the Pseudo-dynamic test can be distorted by the experimental errors inevitably during control and measurement procedures. The studies are to investigate the effects of the experimental errors on the Pseudo-dynamic responses and apply a correction method to the Pseudo-dynamic testing algorithm. It is shown that the corrected responses using the equivalent energy compensation method are in a good correlation with the theoretical ones. Thus, the corrected Pseudo-dynamic responses could be reliable for evaluating the seismic performance of structural systems.

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The Seismic Performance for Concrete-filled Steel Piers (콘크리트 충전 강교각의 내진 성능)

  • 정지만;장승필;인성빈
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2002.09a
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    • pp.189-196
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    • 2002
  • The capacity of CFS piers has not been used to a practical design, because there is no guide of a seismic design for CFS piers. Therefore, the guide of a seismic design value is derived from tests of CFS piers in order to apply it to a practical seismic design. Steel piers and concrete-filled steel piers are tested with constant axial load using quasi-static cyclic lateral load to check ductile capacity and using the real Kobe ground motion of pseudo-dynamic test to verify seismic performance. The results prove that CFS piers have more satisfactory ductility and strength than steel piers and relatively large hysteretic damping in dynamic behaviors. The seismic performance of steel and CFS piers is quantified on the basis of the test results. These results are evaluated through comparison of both the response modification factor method by elastic response spectrum and the performance-based design method by capacity spectrum and demand spectrum using effective viscous damping. The response modification factor of CFS piers is presented to apply in seismic design on a basis of this evaluation for a seismic performance.

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Forced Vibration Test of a Real-Scale Structure and Design of HMD Controllers for Simulating Earthquake Response (실물 크기 구조물의 강제진동실험 및 지진응답 모사를 위한 HMD제어기 설계)

  • Lee, Sang-Hyun;Park, Eun-Churn;Youn, Kyung-Jo;Lee, Sung-Kyung;Yu, Eun-Jong;Min, Kyung-Won;Chung, Lan;Min, Jeong-Ki;Kim, Young-Chan
    • Journal of the Earthquake Engineering Society of Korea
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    • v.10 no.6 s.52
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    • pp.103-114
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    • 2006
  • Forced vibration testing is important for correlating the mathematical model of a structure with the real one and for evaluating the performance of the real structure. There exist various techniques available for evaluating the seismic performance using dynamic and static measurements. In this paper, full scale forced vibration tests simulating earthquake response are implemented by using a hybrid mass damper. The finite element (FE) model of the structure was analytically constructed using ANSYS and the model was updated using the results experimentally measured by the forced vibration test. Pseudo-earthquake excitation tests showed that HMD induced floor responses coincided with the earthquake induced ones which were numerically calculated based on the updated FE model.

The Evaluation of Seismic Performance for Concrete-filled Steel Piers (콘크리트 충전 강교각의 내진 성능 평가)

  • 정지만;장승필;인성빈
    • Journal of the Earthquake Engineering Society of Korea
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    • v.6 no.5
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    • pp.53-58
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    • 2002
  • A recent development, a concrete-filled steel(CFS) pier is an alternative to a reinforced concrete bridge pier in an urban area, because of its fast construction and excellent ductility against earthquakes. The capacity of CFS piers has not been used to a practical design, because there is no guide of a seismic design for CFS piers. Therefore, the guide of a seismic design value is derived from tests of CFS piers in order to apply it to a practical seismic design. Steel piers and concrete-filled steel piers are tested with constant axial load using quasi-static cyclic lateral load to check ductile capacity and using the real Kobe ground motion of pseudo-dynamic test to verify seismic performance. The results prove that CFS piers have more satisfactory ductility and strength than steel piers and relatively large hysteretic damping in dynamic behaviors. The seismic performance of steel and CFS piers is quantified on the basis of the test results. These results are evaluated through comparison of both the response modification factor method by elastic response spectrum and the performance-based design method by capacity spectrum and demand spectrum using effective viscous damping. The response modification factor of CFS piers is presented to apply in seismic design on a basis of this evaluation for a seismic performance.

Evaluation of the Application and Analysis Method at Seismic Design of Dam (댐의 내진설계시 해석방법과 그 적용성 평가)

  • Hwang, Seong-Chun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.9
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    • pp.4239-4249
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    • 2011
  • In the country with frequent earthquakes like Japan, resistance to earthquake is assessed on the basis that Dam body's Face slab is destroyed by concentrated stress. In our country this kind of modeling and analysis is not yet definitely established. This paper performed pseudo static analysis and dynamic analysis for CFRD and evaluated reliability with the results of Shaking Table Test. The Seismic coefficient method, modified seismic coefficient method, Newmark method of Pseudo-static analysis and frequency domain response analysis, time domain history analysis of dinamic analysis were used. The analysis results were differ between analysis method, but the trends of acceleration and displacement were good agreement with the results of shaking table test.

Seismic Performance Evaluation of R/C Frame Apartment Strengthened with Kagome Truss Damper External Connection Method by Pseudo Dynamic Test (유사동적실험에 의한 외부접합형 카고메 트러스 제진장치가 설치된 RC 라멘조 공동주택의 내진성능 평가)

  • Heur, Moo-Won;Chun, Young-Soo;Hwang, Jae-Seung;Lee, Kang-Seok
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.1
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    • pp.23-34
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    • 2015
  • Recently a new damper system with Kogome truss structure was developed and its mechanical properties were verified based on the laboratory test. This paper presents a Kagome truss damper external connection method for seismic strengthening of RC frame structural system. The Kagome external connection method, proposed in this study, consisted of building structure, Kagome damper and support system. The method is capable of reducing earthquake energy on the basis of the dynamic interaction between external support and building structures using Kagome damper. The pseudo-dynamic test, designed using a existing RC frame apartment for pilot application of LH corporation, was carried out in order to verify the seismic strengthening effects of the proposed method in terms of the maximum load carrying capacity and response ductility. Test results revealed that the proposed Kagome damper method installed in RC frame enhanced conspicuously the strength and displacement capacities, and the method can resist markedly under the large scaled earthquake intensity level.

Fragility Analysis of A Scaled Model of Reinforced Concrete Column in Accordance with Similitude Law (상사법칙이 적용된 철근콘크리트 기둥 축소모형의 지진 취약도 분석)

  • Park, Dong Uk;Jeon, Bub Gyu;Kim, Nam Sik;Park, Jamin;Cho, Jae-Yeol
    • Journal of the Earthquake Engineering Society of Korea
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    • v.21 no.2
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    • pp.87-93
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    • 2017
  • Many studies are conducted in several fields for fragility analysis of structures or elements which is a probabilistic seismic safety analysis in consideration with uncertainty of seismic loading. It is hard to directly conduct fragility analysis for an infrastructure with social importance due to its size. Therefore, a fragility analysis for an infrastructure mainly conducted in element level or conducted with scaled model built in accordance with similarity law. In this article, fragility analysis for prototype and scaled model of reinforced concrete column was conducted with numerical models which had been updated by the results of shaking table test and pseudo dynamic test. As a result, response stress from the numerical analysis result of prototype model was higher than that from scaled model due to different stiffness ratios between steel and concrete. However, the probability of failure for scaled model was higher than that for prototype model because failure criteria for scaled model was down due to similarity law. Also it was evaluated that probability of failure by using log normal standard deviation of response stresses by spectrum matched accelerograms was more reliable than probability of failure by using existing coefficient of variation normally used.