Development of an embedded wireless sensor node for post-tensioning tendon force monitoring inside pre-stressed concrete = 포스트텐셔닝 텐던 긴장력 모니터링을 위한 내장형 무선 센서노드 개발

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This study proposes an eddy-current-based tension-reduction-detection (ETRD) technique for a post-tensioning (PT) tendon in a pre-stressed concrete (PSC), and develops a ETRD wireless sensor node (ETRD-WSN) to achieve (1) automatic detection of tension reduction using low cost and low power consuming eddy current sensor (ECS), and (2) semi-permanent monitoring during the whole life-span of a bridge without direct access of human resource. An ECS is attached on PT anchorage holding a PT tendon, and the stress alteration on the PT anchorage is evaluated by investigating the eddy current response varying with its stress condition due to the magnetoelastic effect in a ferromagnetic material. The developed ETRD-WSN consumes only 6 W (12V, 500 mA), and its stable operation is possible under embedded condition by adopting wireless power and data transfer (WPDT) module. The performance of the developed ETRD-WSN is experimentally validated. In laboratory environment, a full-scale mono-strand PT tendon and a jacking instrument were prepared, and it successfully detects an excessive tension reduction over 20 % of initially-introduced tension. Then, the test results in detecting the complete disconnection of a 4.4 m-long bonded external PT tendon system demonstrated the successful performance of the ETRD-WSN. In addition, the actual field application to a 35 m-long PSC girder validated the feasibility of the ETRD-WSN.
Advisors
Sohn, Hoonresearcher손훈researcher
Description
한국과학기술원 :건설및환경공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 건설및환경공학과, 2018.2,[vii, 88 p. :]

Keywords

Eddy current testing▼aMagnetoelastic effect▼aPost-tensioning tendon▼aWireless sensor node▼aBridge health monitoring; 와전류탐상▼a자기탄성 효과▼a포스트텐셔닝 텐던▼a내장형 무선 센서노드▼a교량 건전서 모니터링

URI
http://hdl.handle.net/10203/264395
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=734221&flag=dissertation
Appears in Collection
CE-Theses_Ph.D.(박사논문)
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