Feasibility of the algorithmic optimization of multistory buildings with steel frame

Abstract

The article describes the importance of choosing the optimal decision of structural scheme of multi-story commercial buildings in the preliminary design stage. The advantages of steel structures usage in the steel frames of multi-story office buildings are specified, as well as factors that cause influence to the total weight of steel frame. It is notable that practical implementation of structural optimization is difficult and not common because of complexity of the real modern projects. The search of optimal design solution of multi-story buildings should taking into account many factors and limitations. The goal of our research is to find optimal solutions for the office buildings structural frames up to 100m with a steel frame and central rigid core. The goal is achieved by developing an automated computer optimization system by combining in a single set all of the suitable existing software. Methods. The basis of the optimization system is a logical and graphical software processor Grasshopper 3D, which lets create a whole building frame with varying geometric and other parameters. The system also uses a number of interconnected existing programs: Rhino 3D; SAP2000; Excel and others. The object of research is the office buildings up to 100m height and has 25x25m..50x50m size in plane. Single level height is fixed 4,2m. Columns are placed around the perimeter of the building. Beams are hinged connected to the rigid core and to the columns. At the current stage of research the variable parameters are the topology and bay size of columns beams, as well as cross-sections of steel elements. Results. Developed system is able to automatically search of optimal frame geometry and topology solutions regarding to recalculation of stresses and cross-sections parameters in a way to find decision with the minimum of total weight of steel. The applicability of system is also investigated thoroughly. Scientific innovation. Research shows possibility to create computer system based on existing design and FEM programs for finding the optimal structural solution of high-rise office building steel frame. The practical importance. Optimal decision finding to the metal frame in early preliminary design stage can save considerable time and material resources.