Estudio de sistemas primarios de resistencia ante fuerzas sísmicas en edificaciones aporticadas de mediana altura en la ciudad de Machala

Abstract

This thesis consisted of a study of the structural behavior of an eight-story building for essential use, with a mixed structural system made up of reinforced concrete elements and metal profiles. The study was carried out in the city of Machala, located in an area of high seismic hazard (zone 0.4), on soil type E according to current regulations, which increases structural vulnerability to severe seismic events. Given the complexity of the resistant system and the uncertainty associated with the terrain conditions, the quality of the materials, and the structural configuration, a detailed analysis was proposed based on data collected in situ through technical visits and physical surveys. A linear analysis was developed, using load combinations established by current regulations. Based on the structural model, the fundamental vibration periods, the participatory modal mass in both directions, and the inter-story drifts in the X and Y axes were determined. The resistant and plastic moments were calculated, identifying the most stressed elements and verifying the demand-capacity ratio. Likewise, the maximum shear and moment stresses in critical areas were determined. Compliance with permissible drifts was verified, and the static and dynamic shear forces were adjusted to 85% of the static forces, in accordance with earthquake-resistant regulations, so that the results obtained demonstrate the structural behavior of the building.