Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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Crack Detection Method of Tapered Cantilever Pipe-type Beam with a Tip Mass

말단질량을 갖는 테이퍼 원형강관 캔틸레버 보의 균열탐지기법

  • Lee, Jong-Won (Department of Architectural Engineering, Namseoul University)
  • 이종원 (남서울대학교 건축공학과)
  • Received : 2015.12.29
  • Accepted : 2016.03.29
  • Published : 2016.04.30
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Abstract

A crack identification method using the change of natural frequencies for tapered cantilever pipe-type cracked beam is presented. Modal properties of tapered cantilever intact beam with a tip mass are identified by applying the boundary conditions to a general solution. An equivalent bending stiffness for cracked beam based on an energy method is used to identify natural frequencies of tapered cantilever thin-walled pipe with a tip mass, which has a through-the-thickness crack, subjected to bending. The identified natural frequencies of the cracked beam are used in constructing training patterns of neural networks. Then crack location and size are identified using a committee of the neural networks. Crack detection was carried out for an example tapered beam using the proposed method, and the identified crack locations and sizes agree reasonably well with the exact values.

Keywords

Acknowledgement

Supported by : 남서울대학교

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