Capacidad sísmica residual de un edificio reforzado con perfilería metálica usando análisis no lineal en la ciudad de Ambato

Abstract

To start with the execution of this project we took into account a building located in the city of Ambato, province of Tungurahua, this was born due to the informal construction and non-compliance of structural plans and poor quality of materials. The structure was built of reinforced concrete, reinforced with the method of jacketed columns and beams on metal structure, it has 5 floors and its use is residential. The building was studied the different behaviors that it could have with an Occasional, Frequent, Rare and Very Rare earthquake, as recommended by the NEC-2015 through static and dynamic analysis, verifying its current design conditions and concluding that the building complies with current structural design regulations. The seismic capacity of a structure refers to the total energy that it is capable of dissipating during a seismic event and the residual seismic capacity corresponds to the energy that the structure can still dissipate after a seismic event, under which it has not exhausted all its capacity. In the present investigation, the capacity indexes of the building were determined without reinforcing its mezzanine floors, in this behavior there would have been severe damages in a design seismic event and with reinforcement it could have light damages. The seismic capacity reduction factor calculated with the dissipated energy method by the Japanese Damagexviii Assessment Guide (JBDPA 2015) was determined that for an earthquake Frequent Tr=72 years, Occasional Tr=225 years the damage class would be of a level I that could appear fine cracks smaller than 0, 2 mm and in a Rare Tr=475 years and Very Rare Tr=2500 years earthquake, the damage class would be of a level II where the members of the structure could yield and there could be visible cracks at their ends between 0.2 mm to 1.0 mm wide. In order to complete the study, the costs of rehabilitation and maintenance were determined by means of FEMA P-58 in each seismic event, concluding that currently in a frequent, occasional and rare earthquake it is recommended to repair it, but in a very rare seismic event the cost is similar to the current value of the structure and it is recommended to demolish it.