Comparative study between steel structures using restricted buckling braces (BRB) and dissipators (SLB)

Abstract

Ecuador is located in a high-risk seismic zone and, having been affected by large earthquakes, has opted for the implementation of new structural technologies, one of which is energy dissipators. For this reason, this article aims to perform a comparative analysis between SLB-type seismic dissipators and BRB-type buckling restrained braces, based on models from Yaguana et al., which have a metallic structural composition and essential occupancy. To visualize the effects of the aforementioned devices, a total of six buildings were modeled, divided into three for each dissipator, and then subjected to static and modal spectral analysis. Given that the dissipators operate in the nonlinear range, a pushover analysis was chosen, considering the FEMA and ASCE 41-13 regulations, in order to obtain the capacity curve and performance level. The results obtained demonstrate that SLB dampers have superior performance, achieving a 50% reduction in drift in a four-story building compared to BRB dampers, making this one of the most significant differences between the two dampers.