Application of genetic algorithm to optimization of buckling restrained braces for seismic upgrading of existing structures

Authors:
Fadi Farhat;Shozo Nakamura;Kazuo Takahashi
Affiliations:
Graduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan;Faculty of Engineering, Department of Civil Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan;Faculty of Engineering, Department of Civil Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
Venue:
Computers and Structures
Year:
2009

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Abstract

A systematic methodology is proposed for determining the optimal cross-sectional areas of buckling restrained braces used for the seismic upgrading of structures against severe earthquakes. Single-objective and multi-objective optimization problems are formulated. The objective for the former is cost and those for the latter are cost and damage. The constraint is the minimum structural performance required. A genetic algorithm is employed to solve both types of problem. Performance is estimated by conducting nonlinear dynamic analysis. A preliminary procedure based on static analysis is adopted to improve the search efficiency. Both approaches are applied to the strengthening of a multi-storey frame.