Steel and Composite Structures

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Truss structure damage identification using residual force vector and genetic algorithm

  • Nobahari, Mehdi (Department of Civil Engineering, University of Sistan and Baluchestan) ;
  • Ghasemi, Mohammad Reza (Department of Civil Engineering, University of Sistan and Baluchestan) ;
  • Shabakhty, Naser (School of Civil Engineering, Iran University of Science and Technology)
  • Received : 2016.10.10
  • Accepted : 2017.08.09
  • Published : 2017.11.20
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Abstract

In this paper, damage detection has been introduced as an optimization problem and a two-step method has been proposed that can detect the location and severity of damage in truss structures precisely and reduce the volume of computations considerably. In the first step, using the residual force vector concept, the suspected damaged members are detected which will result in a reduction in the number of variables and hence a decrease in the search space dimensions. In the second step, the precise location and severity of damage in the members are identified using the genetic algorithm and the results of the first step. Considering the reduced search space, the algorithm can find the optimal points (i.e. the solution for the damage detection problem) with less computation cost. In this step, the Efficient Correlation Based Index (ECBI), that considers the structure's first few frequencies in both damaged and healthy states, is used as the objective function and some examples have been provided to check the efficiency of the proposed method; results have shown that the method is innovatively capable of detecting damage in truss structures.

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