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충격반향법에서의 타격 도구에 따른 발생 주파수 최대 범위 분석

Title
충격반향법에서의 타격 도구에 따른 발생 주파수 최대 범위 분석
Other Titles
Frequency Range Analysis due to the Impact Devises at Impact Echo Method
Author
박두희
Keywords
impact echo method; Resonance frequency; Impact hammer; Steel ball
Issue Date
2015-09
Publisher
한국지반환경공학회
Citation
2015년 한국지반환경공학회 정기총회 및 학술발표회, Page. 301-304
Abstract
Impact echo method (IEM), which is one of the concrete healthiness test method, is progressive method to measure the rear side cavity of concrete. When measuring IEM, the maximum frequency range generated by the impact devise is determined by its contact time between impact devise and concrete surface. It is known that the maximum frequency range is one of the key parameters to perform IEM precisely and if the frequency range is smaller than the resonance frequency, the result will not be accurate. In this study, the relationship between contact time of impact devises and maximum frequency range was analysed by performing IEM. For the impact devises, impact hammer and steel balls with diameter of 9 mm and 5.9 mm were used. In case of impact hammer, contact time was relatively long and not proper for the thin concrete plate. In case of steel balls, it is observed that the maximum frequency range increases as the diameter of steel ball decreases. It is therefore shown that impact devises should be chosen considering the resonance frequency of the impact object.
URI
http://www.dbpia.co.kr/Journal/ArticleDetail/NODE06515320?TotalCount=1&Seq=1&q=((%5B%EC%B6%A9%EA%B2%A9%EB%B0%98%ED%96%A5%EB%B2%95%EC%97%90%EC%84%9C%EC%9D%98%20%ED%83%80%EA%B2%A9%20%EB%8F%84%EA%B5%AC%EC%97%90%20%EB%94%B0%EB%A5%B8%20%EB%B0%9C%EC%83%9D%20%EC%A3%BC%ED%8C%8C%EC%88%98%20%EC%B5%9C%EB%8C%80%20%EB%B2%94%EC%9C%84%20%EB%B6%84%EC%84%9D%C2%A7coldb%C2%A72%C2%A751%C2%A73%5D))&searchWord=%EC%A0%84%EC%B2%B4%3D%5E%24%EC%B6%A9%EA%B2%A9%EB%B0%98%ED%96%A5%EB%B2%95%EC%97%90%EC%84%9C%EC%9D%98%20%ED%83%80%EA%B2%A9%20%EB%8F%84%EA%B5%AC%EC%97%90%20%EB%94%B0%EB%A5%B8%20%EB%B0%9C%EC%83%9D%20%EC%A3%BC%ED%8C%8C%EC%88%98%20%EC%B5%9C%EB%8C%80%20%EB%B2%94%EC%9C%84%20%EB%B6%84%EC%84%9D%5E*&searchWordCondition=%EC%9E%90%EB%A3%8C%EC%9C%A0%ED%98%95%3D%5E%24%EC%A0%84%EC%B2%B4%5E*&Multimedia=0&isIdentifyAuthor=0&Collection=0&isFullText=0&specificParam=0&SearchMethod=0&Sort=1&SortType=desc&Page=1&PageSize=50http://hdl.handle.net/20.500.11754/27462
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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