• Title/Summary/Keyword: 진동성능평가

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Estimation of Dynamic Characteristics of Existing Dam Floodgate Using Ambient Vibration (상시 진동을 이용한 댐 수문의 동특성 추정)

  • Kim, Nam-Gyu;Lee, Jong-Jae;Bea, Jung-Ju
    • Journal of the Korean Society for Nondestructive Testing
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    • v.31 no.4
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    • pp.343-350
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    • 2011

  • Recently, as the catastrophic disasters due to earthquake happen frequently all over the world, it draws lots of attention to seismic capacity evaluation and/or structural integrity assessment of deteriorated civil infra-structures. However, there have been few studies on the existing dam flood gates, expecially in Korea. In this study, a proper vibration testing method applicable to a dam flood gate has been suggested, since the dynamic characteristics of a darn flood gate can be fundamental data for seismic capacity evaluation or structural integrity assessment. The frequency domain decomposition technique has been incorporated for modal parameter identification. Two kinds of vibration tests using an impact hammer and ambient vibration sources were carried out on two types of dam floodgates with different shapes. Through the field tests, the effectiveness of the ambient vibration tests were verified.

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Development of silencer for apartment floor between bathroom noise (공동주택 화장실 층간 소음 저감기 개발)

  • Kim, Young-Su;Lee, Jae-Kuck;Kim, Chang-Yeol
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.11a
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    • pp.715-721
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    • 2008

  • 공동주택에서의 음환경 성능은 실내환경의 질과 연관시켜 설계단계부터 충분한 검토가 필요한 성능항목이다. '국토해양부'는 '공통주택 성능등급 표시제도'에서 Air Duct를 통해 상하층간 전파되는 소음을 제어하기 위한 대책을 요구하고 있다. 이에 화장실에 적합한 구조 및 재질로 소음 저감기를 개발하고, 소음기 성능평가 장치를 구성하여 이론과 비교평가하고, 실제 현장에 설치 시 적용효과를 분석하였다.

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Shaking Table Test for Seismic Performance Evaluation of Non-Seismic Designed Wall-Type Apartment (내진설계 되지 않은 공동주택의 진동대 실험에 의한 내진성능 평가)

  • Chung, Lan;Lee, Joung-Woo;Park, Tae-Won
    • Journal of the Korea Concrete Institute
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    • v.18 no.6 s.96
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    • pp.721-728
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    • 2006

  • Earthquakes are reported thai building structures have been colossal damaged, but before 1988 designed structures which were not applicate seismic design code have no seismic performance. Especially, for the apartment structures were indicated that it have no resist wall element of earthquake before 1988 designed structures. We have to evaluate for seismic performance this structures, therefore it will be retrofitted for seismic index sufficient structures. We performed seismic performance evaluation for model structures by MIDAS which is general structure analysis software. In this study, it was performed shaking table test to evaluate model structure which is reinforcement concrete and 5 floors for seismic performance index. We made specimens by similar's law and tested shaking table test. In the shaking table test it is not performed prototype model test because of space and equipment condition. So we had made scale-down model for 1/5 by similar's law. That's why it needs for the evaluation of performance. However, it is not possible to do an experiment of prototype owing to the shortage of space and the limit of an experimental instrument in the shaking table test. Then, modeling and reducing the part of prototype do the experiment. In this experiment a shaking table test is done and seismic performance of model structures is evaluated by using similitude laws for scale down specimen. As a result it is proved that non-seismic design structures need to retrofit since seismic performance shows life safe grade in 0.12g of an earthquake.

  • https://doi.org/10.4334/JKCI.2006.18.6.721 인용 PDF KSCI