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International Journal of Civil Engineering

, Volume 15, Issue 2, pp 135–148 | Cite as

Seismic Optimum Design of Steel Structures Using Gradient-Based and Genetic Algorithm Methods

  • Jalal AkbariEmail author
  • Mohammad Sadegh Ayubirad
Research Paper

Abstract

Optimum design of structures under time-variable loadings is a difficult task. Time-dependent behavior of constraints and cost of gradients calculations could be mentioned when applying time history loadings in the optimization problems. To overcome these difficulties, the response spectra as a seismic demand are used instead of using time history acceleration in the structural modeling. In this paper, the P-Delta effects are considered in the finite-element modeling of the frames. Furthermore, many practical constraints are included in the optimization formulation according to the Iranian national building code (Standard N. 2800). The developed MATLAB-based computer program is utilized for optimization of the low, intermediate- and relatively high-rise braced and un-braced steel frames. The obtained results of sequential quadratic programing (SQP) method are compared with the results of genetic algorithm (GA) technique for guarantying the global optimal designs. Because of the inexpensive costs of SQP method in comparison with genetic algorithm technique, SQP method could be confidently applied for obtaining the global optimum designs of the steel frames.

Keywords

Seismic optimum design Steel frames Response spectrum analysis Sequential quadratic programming (SQP) Genetic algorithm (GA) 

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Copyright information

© Iran University of Science and Technology 2016

Authors and Affiliations

  1. 1.Department of Civil EngineeringMalayer UniversityMalayerIran

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