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http://dx.doi.org/10.11112/jksmi.2014.18.1.138

Estimation Method of Strain Distribution for Safety Monitoring of Multi-span Steel Beam Using FBG Sensor  

Oh, Byung-Kwan (연세대학교 건축공학과)
Lee, Ji-Hoon (대림산업(주))
Choi, Se-Woon (연세대학교 건축구조헬스케어연구단)
Park, Hyo-Seon (연세대학교 건축공학과)
Kim, You-Sok (연세대학교 건축구조헬스케어연구단)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.18, no.1, 2014 , pp. 138-149 More about this Journal
Abstract
This study proposes an estimation method of strain distribution for multi-span steel beam structure under unspecific loading conditions. The estimation method in this paper employs the curve fitting using the least square method from measured strain data, not analytical method. To verify the proposed estimation method, a static loading test for multi-span steel beam on which distributed and concentrated loads act was conducted. The strain data for verification was measured by FBG sensors that have multiplexing technology. The analysis of the accuracy of strain estimation for distributed and concentrated loads and the errors by considering the number of measured points used in the estimation were conducted. In the maximum strain points, the strains could be estimated with the errors of 5.89% (loading step 1) and 6.26% (loading step 2). In case of decreasing the number of sensors, it was also confirmed that the errors increased (0.26~0.37%). Through the curve fitting method, it is possible to estimate the strain distribution (maximum strains and their locations) of multi-span beam for unspecific loads and go over the limit of the analytical estimation method which is suitable for specific distributed loads.
Keywords
Structural health monitoring; Strain estimation; Curve fitting; Multi-span beam; FBG sensors;
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Times Cited By KSCI : 2  (Citation Analysis)
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