Abstract: Steel structure with especial eccentric moment resisting steel frames is an efficient system in terms of convenient implementation, uncomplicated facilities, well-organized enforcements, in-site construction and assembly and the possibility of monitoring and precise control and is thus, widely employed in various countries around the world. Given the significance of construction costs and its association with selected structural system, number of the floors, beam span length, location of columns and the soil type, this study investigates the optimum values of these parameters. The aim of the present study is to find the optimal topology with respect to architectural and applicability considerations. To this end, models with structural hybrid systems and simple steel frames with eccentric bracing capable of formability especial for 5, 10 and 14 floors were selected. The selected models were assumed with equal area and two different soil types. In order to provide parking space based on the urban development regulations, models were considered with span length of 5.6, 7.5 and 11.2 m for 2, 3 and 4 car parks, respectively. Having analyzed the models and designed structural members and foundations, amount and cost of the building material were estimated based on the available rates and the results were compared using figures. The most economical structures were proposed for both soil types and the number of floors.
Mehdi Babaei and Foad Omidi, 2015. Determining the Optimum Spans for Special Steel Moment Resisting Frames with Special Eccentric Braces. Research Journal of Applied Sciences, 10: 474-478.