Análisis no lineal de estructuras regulares de hormigón armado ante eventos tsunamigénicos en la parroquia de Tonsupa, cantón Atacames, provincia de Esmeraldas

Abstract

In 1906, the province of Esmeraldas was hit by an earthquake of magnitude 8.8 on the Ritcher scale followed by tsunami that caused all homes settled near the beach to be destroyed and of 1000 to 1500 people to die. Almost all of the world's tsunamis occur in the Pacific Ocean. Therefore, Ecuador being located in the "Pacific Belt of Fire", characterized by a great volcanic and seismic activity, is considered that the entire line of the Ecuadorian coast is a risk area for this type of tsunamigenic events. With the aforementioned, an analysis of eight structural models of reinforced concrete modeled and analyzed in the ETABS 2019 program was carried out, where the structural performance of the sequential action of the earthquake and tsunami was evaluated, considering the degradation of the rigidity and resistance caused by the earthquake, to ensure that the degraded structural capacity is sufficient to cope with the effects of the tsunami. For this a linear and nonlinear static analysis was performed, taking into consideration for the first case the requirements established in the NEC-SE-DS 2015 standard for earthquake effects, as well as the international code FEMA P646 and ASCE 7-16 for tsunami effects, for the second case the ASCE 41-17 was taken into account obtaining the curve of capacity, maximum drifts and performance point of the structures for these two events. It was observed that the structures of 4.6 and 7 floors can continue in operation since once the tsunamigenic event occurs, the structures achieve a level of protection of life, in which moderate damage occurs, the models of 8,9,10, 11 and 12 floors, are the ones that would suffer the most damage in the event of a consecutive earthquake-tsunami event since the level of performance produced presents severe damage to structural elements.