As a new paradigm for safety assessment of beam structures, this paper proposes a sensor-free monitoring model to estimate the stress distribution of steel beam structures with uncertain loads. The model consists of three steps: 1) the use of a sensor- and wire-free measurement step using a motion capture system; 2) a deformed shape estimation step employing cubic smoothing spline interpolation; and 3) a stress distribution and maximum stress estimation step using the radius of curvature of the estimated deformed shape or a finite-element method. Therefore, unlike the conventional sensor-based structural health monitoring with lengthy cables, the model can determine the maximum stress in a non-contact manner without the deterioration of the measurement accuracy. The sensor-free stress estimation method was applied to estimate the stress distribution of a steel beam structure subjected to static loads applied at the mid-span of the beam by a hydraulic jack. The validity of the proposed method was confirmed by comparing the estimated stresses with stresses measured in static loading tests.
Bibliographical noteFunding Information:
Manuscript received November 25, 2015; revised January 13, 2016; accepted January 14, 2016. Date of publication January 18, 2016; date of current version February 24, 2016. This work was supported by the National Research Foundation of Korea within the Ministry of Science, ICT and Future Planning through the Korean Government under Grant 2011-0018360. The associate editor coordinating the review of this paper and approving it for publication was Prof. Subhas C. Mukhopadhyay. (Corresponding author: Hyo Seon Park.)
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All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering