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A Study on the Influence Factors on Flexural and Thickness Modes in the Impact-echo Test

충격반향기법에서의 휨 모드 및 두께 모드의 영향인자에 대한 연구

  • Oh, Tae-Keun (Department of Safety Engineering, Incheon National Univ.) ;
  • Park, Jongl-Il (Department of Safety Engineering, Seoul National Univ. of Science and Technology) ;
  • Byun, Yoseph (Korea Infrastructure Safety and Technology Corporation) ;
  • Lee, Young-Hak (Department of Architecture Engineering, Kyung Hee Univ.)
  • 오태근 (인천대학교 안전공학과) ;
  • 박종일 (서울과학기술대학교 안전공학과) ;
  • 변요셉 (한국시설안전공단 시설안전연구소) ;
  • 이영학 (경희대학교 건축공학과)
  • Received : 2015.10.08
  • Accepted : 2015.11.03
  • Published : 2015.12.29

Abstract

In this paper, various influence factors on the impact-echo test which is an effective method in characterizing defects such as such as the delamination in the concrete structures were studied. The side to thickness ratio(a/h), the relative position of impacting and sensing points over the delamination that have great effects on the flexural and impact-echo(thickness) modes were investigated and examined by the parametric finite element analysis. As a result, the flexural modes dominate in the case of a/h > 2 and the thickness mode was more evident when a/h < 2. With regard to the relative position of impact source and sensing point to the defect, the flexural modes dominate even when either the loading or sensing point was over the delamination defect. However, the thickness mode prevails when both the impacting and sensing points are over the solid region beyond the delamination area.

Acknowledgement

Supported by : 한국연구재단

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