Variación de la respuesta sísmica en edificios de pórticos de hormigón armado arriostrados con diagonales de cables de acero

Abstract

This study was born due to the little information currently available on the behavior of reinforced concrete buildings braced with diagonals of steel cables. The purpose of this investigation is to determine how this type of bracing affects seismic effects. To achieve this was made the model of 10 buildings, 5 of 4 floors and 5 of 6 floors. This was done in Etabs by means of a spectral modal seismic analysis with the parameters of the Ecuadorian Construction Standard NEC15. In addition, a proposal is proposed for calculating diagonal anchorage to the reinforced concrete elements of the porticos, to be applied in new and existing buildings. The change of response of the buildings when being braced with steel cables was evaluated, comparing the dynamic properties, shear forces and moment, and finally the drift of mezzanines, with the unbraced buildings. From this study it can be concluded that this bracing system is capable of changing the fundamental period of the structures, mitigate the cutting and moment efforts, and in turn reducing the drift of the mezzanines by up to 50%. The presence of the cables produces a significant variation of the seismic response especially in the buildings of 4 floors.