Sensor-free stress estimation model for steel beam structures using a motion capture system

Jun Su Park, Byung Kwan Oh, Se Woon Choi, Hyo Seon Park

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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.

Original languageEnglish
Article number7384429
Pages (from-to)2701-2713
Number of pages13
JournalIEEE Sensors Journal
Issue number8
Publication statusPublished - 2016 Apr 15

Bibliographical note

Publisher Copyright:
© 2016 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering


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