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Earthquakes are natural events, caused mainly due to the relative movement between tectonic plates (interplate earthquakes) and in faults between rocky blocks (intra-plate earthquakes), or induced by human activity. It is possible to observe a relation between the regions located in areas with greater seismicity and the areas that are close to several intraplate failures and shale gas reserves in Brazil. According to NBR 15421/2006, this condition results in a map of seismic accelerations characteristic of the design. Such accelerations can be used to estimate equivalent horizontal loads. However, it is not usual to consider these effects in the design of reinforced concrete buildings. Therefore, this work aims to evaluate the global stability of reinforced concrete buildings with different bracing systems, subject to seismic accelerations provided for in NBR 15421/2006. Initially, the global stability was verified considering the wind and vertical actions by the γz coefficient. Therefore, all the frames analysed in this paper behaved as non-sway structures (γz ≤ 1,10). Then the wind actions were replaced by seismic ones since it is improbable that both phenomena occur simultaneously. Finally, global stability was re-evaluated by means of the γz coefficient. Therewith, it was observed that all the buildings analysed started to behave as structures of mobile nodes (γz > 1,10), that is, susceptible to the second-order global effects.

Análise simplificada do efeito de ações sísmicas em edifícios de concreto armado dimensionados pela norma brasileira