Optimal layout for intermediate steel moment resisting frames with special chevron braces

Abstract

Background: Topology and shape of structures are very important in weight and cost optimization. Regarding structural performance, dual structural system of steel moment resisting frames with chevron braces has many applications in the world and Iran. Methods/Statistical Analysis: In this paper, construction cost optimization of this system is investigated for the different number of floors, span lengths, and the soil types. In total, 18 building models are examined and estimated for costs, which they are defined regarding to the architectural requirements for parking areas and codes regulations for design. Storey heights are assumed to be 3.5meters for all models and the construction site is in Tehran with very high earthquake risk. Construction cost is estimated based on the current Iranian price list. Findings: The obtained results are compared with each other, regardless of the land price and then optimal ratio between the land price and construction costs is calculated for the optimal model. The findings show that 5-storey structures with shorter span length (5.6meters) are more economical. However, in the case of 10 and 14-storey structural models, 7.5meters span for parking of three vehicles, is more economical. In the other words, by increasing the height of the building the optimum span length increases. In addition, the type of soil is more effective in the total structural cost by increasing the height of the structure. Application/Improvements.