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- 저자 : Mohammadhosein Talebpour (검색결과 1 건)
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Amirhosein Mohajer,Vahidreza Kalatjari,Mohammadhosein Talebpour 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.1
This study aims to optimize the weight of steel frames (as the objective function) to satisfy the legal constraints (inter-story drift and strength). The ultimate goal was to select an optimal arrangement and coordinate the two types of convergent bracing (multi-story X-bracing and X-bracing) in low, mid, and high-rise steel frames with specifi c dimensions and spans. In the end, an optimal weight design will be presented for the frames under the design constraints (by LRFD method), frequency, drift, and position of braces in frame height, and the amount of the tensile force of braces. Since the frequency constraints in design variables are highly nonlinear and non-convex, it is cumbersome to use them in optimization problems. In this research, the frames have been optimized using the connection between two software OPENSEES and MATLAB based on a multi meta-heuristic optimization algorithm with discrete variables (a new, mixed-method based on parallel island model with four islands). The fi ndings of this research include the optimal position of braces, sections, and convergence history for the frames under a multi meta-heuristic optimization algorithm. The diagrams of convergence history were also provided for the particle swarm algorithm in mid-rise frames. The results show the superiority of the multi meta-heuristic search algorithm in the convergence speed and the quality of the optimal response compared to the particle swarm optimization algorithm. Optimizing with the multi meta-heuristic algorithm reduces the impact of parameters and the relations governing the operation. Finally, the optimal design is obtained. According to the results, the multi-story X-bracing frames (the combination of inverted V-Bracing and V-Bracing) have more optimized weight and, thus, better structural response than the X-bracing frames. Placing braces in the middle spans of frames and adjacent to each other was the optimal design and position for all frames.
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