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Sensors 2013, 13(8), 9909-9920; doi:10.3390/s130809909

A Strain-Based Load Identification Model for Beams in Building Structures

Department of Architectural Engineering, Yonsei University, 50 Yonsei-ro, Seoul 120-749, Korea
* Author to whom correspondence should be addressed.
Received: 26 June 2013 / Revised: 31 July 2013 / Accepted: 31 July 2013 / Published: 5 August 2013
(This article belongs to the Section Physical Sensors)
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A strain-based load identification model for beam structures subjected to multiple loads is presented. The number of sensors for the load identification model is the same as the number of load conditions acting on a beam structure. In the model, the contribution of each load to the strains measured by strain sensors is defined. In this paper, the longitudinal strains measured from multiplexed fiber Bragg grating (FBG) strain sensors are used in the load identification. To avoid the dependency on the selection of locations for FBG sensors installed on a beam structure, the measured strain is expressed by a general form of a strain sensing model defined by superimposing the distribution shapes for strains from multiple loads. Numerical simulation is conducted to verify the model. Then, the load identification model is applied to monitoring of applied loads on a 4 m-long steel beam subjected to two concentrated loads. In the experiment, seven FBG sensors and nine electrical strain gages (ESGs) were installed on the surface of the bottom flange. The experimental results indicate a good agreement between estimated loadings from the model and the loads applied by a hydraulic jack.
Keywords: strain sensing; load identification; structural health monitoring; steel beams strain sensing; load identification; structural health monitoring; steel beams
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hong, K.; Lee, J.; Choi, S.W.; Kim, Y.; Park, H.S. A Strain-Based Load Identification Model for Beams in Building Structures. Sensors 2013, 13, 9909-9920.

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