Estudio sismorresistente en edificaciones: mercado municipal del cantón Camilo Ponce Enríquez

Abstract

This research evaluates the seismic behavior of the Camilo Ponce Enríquez Municipal Market, a structure built according to Ecuadorian regulations NEC-2015. A modal spectral analysis was performed using structural software to determine the building's seismic response. The results indicated that although the structure complies with the maximum displacements and drifts established by the NEC-2015 (0.763% in the Y direction and 1.667% in the X direction, both below the 2% limit), the original design exhibits structural deficiencies. Many beams showed shear failures, and several columns operated with reinforcement ratios near or above 3%, exceeding the maximum allowed by the code. Furthermore, it was found that most structural elements were designed with the minimum reinforcement ratio, which is insufficient to withstand significant seismic demands. Only a few elements, such as a circular column with a diameter of 45 cm and some beams in Block 2, met the required design standards. Optimized structural sections were proposed in Block 1: one beam was increased from 70x40 cm to 70x45 cm with a reinforcement ratio of 0.94%, and a circular column was increased from 60 cm to 70 cm in diameter with a reinforcement ratio of 1.3%. In Block 2, key elements were redesigned, achieving demand-capacity efficiencies between 90% and 91%.