Espectro de Respuesta de Arenas Sueltas Licuables-perfil F1 (Peligro Sísmico)

One of the problems facing the civil engineer is the proper design of structures. In the Ecuadorian standard NEC-SE-DS where the seismic hazard is quantified, there is a typology of soil identified as F1 in which it is established that when in the geotechnical profile there are soils that under the seismic action are susceptible to liquefy, they must be made particular studies to evaluate the dynamic response of the profile and establish the spectral shape and the horizontal acceleration coefficient to be used in the design. The present research will analyze the dynamic response of potentially liquefiable loose sands using the Cyclic 1-D program, which allows to consider the increase in pore pressure under seismic action, the decrease in effective efforts in the soil and consequently the reduction of the shear strength, as well as the change of rigidity and damping with the deformation. To do this, lithological profiles of liquefiable loose sands were defined, varying in thickness from 5 m to 30 m, which were subjected at their base to instrumental earthquakes of varying intensity, frequency and duration, which defined the design spectra based on the level of seismic acceleration.