Advances in Computational Design

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Seismic response analysis of mega-scale buckling-restrained bracing systems in tall buildings

  • Gholipour, Mohammadreza (Department of Civil Engineering, Shahid Rajaee Teacher Training University) ;
  • Mazloom, Moosa (Department of Civil Engineering, Shahid Rajaee Teacher Training University)
  • Received : 2017.12.13
  • Accepted : 2018.01.19
  • Published : 2018.01.25
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Abstract

Tall buildings are categorized as important structures because of the large number of occupants and high construction costs. The choice of competent lateral load resisting systems in tall buildings is of crucial importance. Bracing systems have long been an economic and effective method for resisting lateral loads in steel structures. However, there are some potential adverse aspects to bracing systems such as the limitations they inflict on architectural plans, uplift forces and poor performances in compression. in order to eliminate the mentioned problems and for cost optimization, in this paper, six 20-story steel buildings and frames with different types of bracing, i.e., conventional, mega-scale and buckling-restrained bracing (BRB) were analyzed. Linear and modal push-over analyses were carried out. The results pointed out that Mega-Scale Bracing (MSB) system has significant superiority over the conventional bracing type. The MSB system is 25% more economic. Some other advantages of MSB include: up to 63% less drift ratio, up to 38% better performance in lateral displacement, up to 100% stiffer stories, and about 50% smaller uplift forces. Moreover, MSB equipped with BRB attests even a better seismic behavior in the aforementioned parameters.

Keywords

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