Smart Structures and Systems

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Damage localization and quantification in beams from slope discontinuities in static deflections

  • Ma, Qiaoyu (Department of Continuum Mechanics and Structural Analysis, Escuela Tecnica Superior de Ingenieria, Universidad de Sevilla) ;
  • Solis, Mario (Department of Continuum Mechanics and Structural Analysis, Escuela Tecnica Superior de Ingenieria, Universidad de Sevilla)
  • Received : 2018.03.20
  • Accepted : 2018.07.03
  • Published : 2018.09.25
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Abstract

This paper presents a flexibility based method for damage identification from static measurements in beam-type structures. The response of the beam at the Damaged State is decomposed into the response at the Reference State plus the response at an Incremental State, which represents the effect of damage. The damage is localized by detecting slope discontinuities in the deflection of the structure at the Incremental State. A denoising filtering technique is applied to reduce the effect of experimental noise. The extent of the damage is estimated through comparing the experimental flexural stiffness of the damaged cross-sections with the corresponding values provided by analytical models of cracked beams. The paper illustrates the method by showing a numerical example with two cracks and an experimental case study of a simply supported steel beam with one artificially introduced notch type crack at three damage levels. A Digital Image Correlation system was used to accurately measure the deflections of the beam at a dense measurement grid under a set of point loads. The results indicate that the method can successfully detect and quantify a small damage from the experimental data.

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References

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