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Identification of coexistent load and damage

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Abstract

Load reconstruction and damage identification are crucial problems in structural health monitoring. However, it seems there is not much investigation on identification of coexistent load and damage, although in practice they usually exist together. This paper presents a methodology to solve this problem based on the Virtual Distortion Method. A damaged structure is modeled by an equivalent intact structure subjected to the same loads and to virtual distortions which model the damages. The measured structural response is used to identify the loads, the distortions and to recover the stress-strain relationship of the damaged elements. This way both the damage type and extent are identified. The approach can be used off-line and online by repetitive applications in a moving time window. A numerical experiment of a truss with 5% measurement error validates that the two tested damage types (constant stiffness reduction and breathing crack) can be identified along with the loads.

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Authors and Affiliations

  1. School of Civil Engineering, Harbin Institute of Technology, P.O. Box 2546, 202 Haihe Road, Harbin, 150090, China

    Qingxia Zhang & Zhongdong Duan

  2. Smart-Tech Centre, Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5b, 02-106, Warsaw, Poland

    Qingxia Zhang & Łukasz Jankowski

Authors
  1. Qingxia Zhang
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  2. Łukasz Jankowski
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  3. Zhongdong Duan
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Correspondence to Łukasz Jankowski.

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Zhang, Q., Jankowski, Ł. & Duan, Z. Identification of coexistent load and damage. Struct Multidisc Optim 41, 243–253 (2010). https://doi.org/10.1007/s00158-009-0421-1

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  • DOI: https://doi.org/10.1007/s00158-009-0421-1

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