Performance-based optimum seismic design of steel structures by a modified firefly algorithm and a new neural network. (March 2015)

• Record Type: Journal Article
• Authors: Gholizadeh, Saeed
• Is Part Of: Advances in engineering software. Volume 81(2015)
• Page Start: 50
• Page End: 65
• Publication Date: 2015-03
• Subjects: Structural optimization -- Firefly algorithm -- Neural network -- Performance-based design -- Wavelet -- Earthquake; Computer-aided engineering -- Periodicals; Engineering -- Computer programs -- Periodicals; Engineering -- Software -- Periodicals; Periodicals; 620.0028553
• DOI: 10.1016/j.advengsoft.2014.11.003
• Languages: English
• ISSNs: 0965-9978

Abstract

Highlights: An efficient methodology is proposed for performance-based structural optimum design. Optimization task is achieved by a modified firefly algorithm. A new neural network model is proposed to predict the results of pushover analysis. Abstract: Structural optimization for performance-based seismic design (PBSD) in earthquake engineering aims at finding optimum design variables corresponding to a minimum objective function with constraints on performance requirements. In this study, an efficient methodology, consisting of two computational strategies, is presented for performance-based optimum seismic design (PBOSD) of steel moment frames. In the first strategy, a modified firefly algorithm (MFA) is proposed to efficiently find PBOSD at the performance levels. Because that for computing the structural responses at the performance levels a nonlinear static pushover analysis must be conducted, the overall computational time of optimization process is extremely large. In the second strategy, to reduce the computational burden, a new neural network model termed as wavelet cascade-forward back-propagation (WCFBP) is proposed to effectively predict the results of nonlinear pushover analysis during the optimization process. To illustrate the effectiveness of the proposed methodology, 3, 6 and 12 storey planar steel moment resisting frames are optimized for various performance levels. The results demonstrate the effectiveness of the proposed soft computing-based methodology for PBOSD of steel structures spending low computational cost.