Abstract
This chapter deals with performance design of buckling-restrained braced frames (BRBF) using different variants of colliding bodies optimization (CBO) algorithms. To fulfill this aim and improve present CBO-based methods, a new opposition-based CBO is also developed and compared with the other CBO-based methods containing standard, enhanced, and two-dimensional CBO. Structural responses at seismic performance levels are obtained by using a nonlinear pushover analysis. The minimum structural weight is selected as the main objective function and design constraints contain the interstory drift, plastic displacement of buckling-restrained braces, as well as plastic rotation of beam and column members. Three examples are presented to evaluate the capabilities of the CBO-based algorithms for performance-based optimum deign of BRBFs. A layout optimization of selected structures is also performed.
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