Abstract
In this paper, performance-based optimization design of steel concrete composite moment resistance frames is presented using a chaotic optimization algorithm based on Chebyshev chaotic map. The strategy is applied to two examples of an 8-story frame and a 20-story frame. The structure is designed to respond to different levels of seismic hazard levels for the minimization of total weight. To achieve this goal, three main steps are conducted. In the first step, the five best designs for each of the frames were obtained by solving the optimization problem. Nonlinear pushover analysis was conducted to arrive at each performance level. In the next step, the fragility curves are plotted for five selected designs for each frame, and finally, damage margin ratios were calculated for each damage level and the best design for each frame was selected based on the damage margin ratio values. Results illustrate a desirable performance of the algorithms in both obtaining lower weight and selecting the best design based on the seismic behavior of the structure.
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