Análisis sísmico de edificaciones de mediana altura aplicando riostras Brb y comparación con sistema estructural convencional con pórtico resistente a momento

Abstract

Among the ways of controlling seismic events in structures and safeguarding human life, elements capable of reducing damage to buildings have been created. We will focus on one of the seismic dissipation systems, the Buckling Restrained Braces (BRB). The objective of this paper is to obtain cost-benefit feasibility results by making a comparison between a medium height structure (7 stories) in reinforced concrete and structural steel, for conventional portal frame structures and portal frame with Buckling Restrained Braces. In order to obtain these results, a pre-dimensioning of the structural elements was initially performed, according to the location of the project and type of soil, a seismic analysis was performed with the help of current regulations (NEC SE-SG, NEC SE-DS, NEC SE-AC), with the application of a commercial structural analysis software, the structures were modeled, Finally, beams, girders, columns, slabs and footings were designed using current standards (ACI-318-19, NEC-SE-HM, AISC-341-10, ACE-7-16, AISC-360-10, ASTM A36) and the corresponding structural plans were drawn in order to obtain quantities and costs. The same procedure was applied for the BRB portal frame structure. Regarding the comparison of total costs, an increase of 6 % and 2 % was obtained in the structures with BRB, being an irrelevant value related to the benefits provided by the application of these elements.