Comparación de la respuesta dinámica de estructuras aporticadas de hormigón armado utilizando los métodos modal espectral (Nec 2015) y tiempo historia de aceleraciones (Pedernales 2016)

Abstract

In this investigation will be carried out a comparison of the dynamic responses of different regular structures frame of reinforced concrete (2, 5 and 10 floors), using linear models of Force-based Design (DBF), the spectral Modal method established by the Ecuadorian Standard of the Construction (NEC-2015), derivatives from the history of accelerations of Pedernales 2016 and nonlinear time-history analysis of accelerations. Through SAP2000 program, the modeling of the different structures proposed was carried out based on the pre-designs and through the results obtained for each method of analysis carried out, it was possible to quantify the extent to which drifts was exceeded, increase of the solicitations in the different structural elements, solicitations in the foundation and floor shears. The performed analysis in different edifications, allows to conclude that derived solicitations from nonlinear time-history analyzes exceed the calculate forces from the spectral modal analyzes indicated in the NEC-15 and to the one obtained from the Acelerogram measured in Pedernales (SEISMOSIGNAL) when using a factor of response reduction of 8, so it is suggested to make changes in both, in response reduction factor R and in the surface acceleration value z, in order to approximate the spectral modal analyzes to the more rigorous analysis (nonlinear time-history) and avoiding to exceed the 2,5 % drift established as a condition of collapse of buildings according to Vision 2000.