Optimal Design of the Diagrid Structural Systems using Improved Genetic Algorithm

One of the new structural systems utilized in high-rise structures is diagrid structural systems. In this type of structural system, the columns are removed and the diagrid members are replaced. In other words, in addition to carrying gravity loads, the diagrid members also control lateral loads and there is no need to design a lateral load-bearing system for the structure. The buildings built with this system, in addition to innovation in the structural system, have a beautiful and unique architectural design. One of the most important and effective design parameters in diagrid structures is determining the angle of diagrid members. This angle directly affects the weight of the structure. In the present research, the angle of diagrid members has been studied and evaluated. For this purpose, a 24-storey building has been analyzed and optimized. In order to optimize the structure, an improved genetic algorithm has been used. In this regard, using the genetic algorithm, the optimal weight of the frame at different angles for the diagrid structural system as well as the structural system with mega bracing is determined and the optimal weight is presented. The weight of the diagrid structure was compared with the weight of the mega bracing system. The results show that the optimal angle of the diagonal members in the mega bracing system is approximately 36 degrees, while this angle is approximately 65 degrees for the diagrid system.