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

Architectural Institute of Korea (대한건축학회)
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Pipe Crack Identification of Elastically Restrained Cantilever-type Beam

탄성지지된 원형강관 캔틸레버형 보의 균열탐지기법

  • Lee, Jong-Won (Department of Architectural Engineering, Namseoul University)
  • 이종원 (남서울대학교 건축공학과)
  • Received : 2017.01.19
  • Accepted : 2017.03.29
  • Published : 2017.05.30
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Abstract

A method to detect location and size of a pipe crack in elastically restrained cantilever-type beam using changes in natural frequencies is presented. Modal properties of elastically restrained cantilever-type beam 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 elastically restrained cantilever-type thin-walled pipe, which has a through-the-thickness crack, subjected to bending. Then, numerical simulations are carried out to construct a set of training patterns of a neural network, and committee of neural networks is employed to identify the crack. Crack identifications are carried out for the 4 damage cases experimentally, and the identified crack locations and sizes agree reasonably well with the exact values.

Keywords

Acknowledgement

Supported by : 남서울대학교

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