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

Architectural Institute of Korea (대한건축학회)
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Fault Detection Method of Tapered Cantilever Pipe-type Beam

테이퍼 원형강관 캔틸레버 보의 결함탐지기법

  • 이종원 (남서울대학교 건축공학과)
  • Received : 2014.09.27
  • Accepted : 2015.02.09
  • Published : 2015.02.28
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Abstract

A crack identification method using an equivalent bending stiffness for cracked beam and committee of neural networks is presented. Modal properties of tapered cantilever pipe-type beam is identified by applying the boundary conditions to a general solution for tapered beam. A bending stiffness for cracked beam based on an energy method is used to identify natural frequencies and mode shapes of tapered cantilever thin-walled pipe, which has a through-the-thickness crack, subjected to bending. The identified modal properties 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 beam using the proposed method, and the identified crack locations and sizes agree reasonably well with the exact values.

Keywords

Acknowledgement

Supported by : 한국연구재단

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