STRUCTURAL EVALUATION FOR EARTHQUAKE AND TSUNAMI IN FOUR SHELTERS AS A VERTICAL EVACUATION ZONE IN THE DISTRICT OF LA PUNTA – CALLAO-PERÚ

Vasquez R.E.; Bazan J.L.; Zavala C.A. · World Conference on Earthquake Engineering proceedings (2021)

Resumen

The evaluation procedure for earthquakes and tsunamis for four vertical shelters for tsunamis are shown in this paper. The buildings, which were selected as vertical shelters, are located at La Punta district, Callao Province, Lima region. This location is exposed to a high hazard of flooding by a tsunami. The four buildings are located less than 100 meters away from the coastline, they have between 4 to 8 floors. Its structural system is resistant to beams and columns and/or structural walls; It is worth mentioning that they were built between 1967-1969, whose construction standard is prior to the first Peruvian earthquake-resistant standard (1977). The existing structures and architecture drawings have been used to develop the finite element models that consider the non-linearity of the materials. A severe earthquake request has been used according to the Peruvian earthquake-resistant standard E.030 (2018). The capacity response of each structure was obtained through a push-over analysis. Once the post-earthquake behavior was obtained, each structure was evaluated by the impact of the tsunami, the impact force of the wave entering the model according to the equivalent load method of Y. Nakano (2008). This study considered parameters such as wave height, distance from the coast, flood depth, building height, tsunami pressure and acting pressure height for the determination of the hydrostatical force. It should be noted that tsunami-generated waves usually have much longer periods than earthquakes and any structure to be used as a vertical evacuation point must adequately resist such tsunami-generated forces; therefore, its resistance should be emphasized more than ductility. Finally, the capacity of each building was obtained vs the demand for tsunami with respect to the first floor and it was determined if the structures under study are capable of fulfilling the function of 'Shelter Building for Vertical Evacuation' against a tsunami with wave height h = 5.0 m (maximum historical depth of Tsunami recorded, Flood Maps of the Peruvian Navy). If this function is not fulfilled, recommendations were made for their rehabilitation.

Instituciones: Universidad Nacional de Ingeniería