Structural Engineering and Mechanics

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Nonlinear analysis based optimal design of double-layer grids using enhanced colliding bodies optimization method

  • Kaveh, A. (Center of Excellence For Fundamental Studies in Structural Engineering, School of Civil Engineering, Iran University of Science and Technology) ;
  • Moradveisi, M. (Road, Housing and Urban Development Research Center)
  • Received : 2015.12.29
  • Accepted : 2016.03.03
  • Published : 2016.05.10
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Abstract

In this paper an efficient approach is introduced for design and analysis of double-layer grids including both geometrical and material nonlinearities, while the results are compared with those considering material nonlinearity. Optimum design procedure based on Enhanced Colliding Bodies Optimization method (ECBO) is applied to optimal design of two commonly used configurations of double-layer grids. Two ranges of spans as small and big sizes with certain bays of equal length in two directions are considered for each type of square grids. ECBO algorithm obtains minimum weight grid through appropriate selection of tube sections available in AISC Load and Resistance Factor Design (LRFD). Strength constraints of AISC-LRFD specifications and displacement constraints are imposed on these grids.

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