Efectos de aislamiento de base elastoméricos en las aceleraciones de piso de una estructura para componentes no estructurales

Abstract

Nowadays in Latin America, non-structural components (NSC) do not get as much importance as they should within seismic design codifications. This added to the lack of seismic protection systems, increase the probability of damage on NSCs during an earthquake. In the past, during the events of USA (1994), Japan (1995) and Chile (2010), neglecting the NSCs from seismic designs led to significant economic losses. This losses were due to primarily: 1) the cost of inoperativeness post-event and 2) the replacement of expensive equipment. For this reason and in order to prevent a similar scenario, this thesis has the goal to quantify the effectiveness of using an elastomeric base-isolation system on floor accelerations for NSC within the structure, compared to a non-isolated structure. Floor accelerations are the base input to calculate demands on rigid and flexible NSCs. To calculate demands on flexible and rigid NSCs, the Floor Response Spectrum (FRS) and Peak Floor Acceleration (PFA) methods were used respectively, both consist of a time-history analysis. This analysis was performed considering an elastic and inelastic behavior of the isolated and non-isolated structure. The results obtained show a reduction in acceleration of 87% when comparing the isolated and non-isolated elastic models, meanwhile a reduction of about 81% when comparing the inelastic models respectively. From the results obtained, it is concluded that the inclusion of isolation on the structure decreases in more than an 80% the demands of acceleration that affect NSCs within the structure. This also proves the effectiveness of using this type of seismic protective systems