Cálculo de curvas de fragilidad de estructuras de hormigón armado de un piso alto con vigas banda y cubierta liviana en residencias ubicadas en vía a la Costa, Guayaquil – Ecuador.

Abstract

The present study focuses on reinforced concrete structures of high-rise single-family residences, featuring band beams and lightweight roofing, located in a residential development “Vía La Costa, Guayaquil – Ecuador”. The analysis involved calculating fragility curves to provide an initial approximation of the expected damages in such buildings under seismic conditions. The methodology employed a mixed approach utilizing results from a nonlinear Push-Over analysis, incorporating capacity curves and their Bilinear curve to define damage state limits proposed by LM2 – Risk UE. Subsequently, the exceedance probability of the curves was determined by evaluating structural performance against seismic demands generated from response spectra of accelerograph records. Fragility curves were meticulously formulated using representative frames in both the "x" and "y" directions within two selected buildings. For seismic intensity levels corresponding to return periods of 43, 72, 475, and 975 years, it was demonstrated that frames in the "x" direction exhibit a maximum deviation of 1% probability in reaching a specific damage level. On the other hand, frames in the "y" direction display maximum probability differences of 2% in undamaged states, 1% in slight damage, 8% in moderate damage, 9% in extensive damage, and 10% in complete damage.