Análisis estructural del desempeño sísmico del edificio del Gobierno Autónomo Descentralizado de la parroquia Picaihua, ubicado en el cantón Ambato, provincia de Tungurahua

Abstract

For the present investigation, qualitative and quantitative analyses were carried out in order to evaluate the seismic performance of the building of the Decentralized Autonomous Government of the Picaihua parish. The qualitative analysis was performed through rapid visual evaluation applying the methodologies proposed by the FEMA 154 and NEC 2015 standards, whose qualification parameters are based on the characteristics of the building, structural system, soil type, irregularity in plan and elevation, and problems of pounding with adjacent structures. The results obtained were 1.5 and 3.3, respectively, which show that the structure has low seismic vulnerability. In the quantitative method, linear analysis and nonlinear static analysis (Pushover) were performed using ETABS 2018 software. With the results obtained from these analyses, it was determined that the structure presents torsion in plan, excessive drifts higher than the maximum allowed of 2 percent, deficient response capacity before the different levels of seismic hazard, especially in the case of a very rare earthquake where the building collapses completely, thus requiring reinforcement. Once the shortcomings of the structure were identified, a global reinforcement was proposed, consisting of the implementation of shear walls to provide greater flexibility, correct torsion and excessive drifts. With the implementation of the shear walls, the linear and nonlinear static analysis was performed again, proving that the reinforcement allowed improving the performance of the structure, obtaining a vibration period of 0.489sec, drifts lower than 2 percent, from the Demand/Capacity check of the columns, values lower than the maximum allowed of 1 were obtained, there is no torsion in plan, thus complying with the checks established by the current standards and reaching a performance level of collapse prevention for a very rare earthquake.