Análisis comparativo de una estructura habitacional con diagonales excéntricas y una estructura sin diagonales excéntricas, ante una solicitación sísmica

Abstract

The main objective of this research work was the comparative analysis of a housing structure under seismic stress, taking as a reference point the urban area of Ambato, capital city of the province of Tungurahua, where the building under study is located. A specialized software was used for the modeling and design of the structure, as well as the guidelines of the Ecuadorian construction standard NEC-SE-DS 2015 and ANSI/AISC 360 and 341, respectively. The results obtained were satisfactory with respect to drifts and deflections, according to the configuration in columns, beams and diagonals it was not necessary to redesign the sections of the structural elements. Regarding the analysis, it should be noted that both the structure without eccentric braced frame and the structure with eccentric braced frame obtained an adequate behavior, with drifts of less than 2 percent that comply with the stipulations of the standard, but a notable difference was evidenced in the sections of both columns and beams, obtaining a 45.88 percent reduction in the weight of the structural elements. In the structure with eccentric braced frame, the drifts were maintained within the established limits for this typology according to the NEC with the inclusion of some diagonals, which helped to improve the behavior, reducing considerably the different sections of the structural elements, thus lightening the structure, achieving a balance and avoiding torsional effects in the floor plan, as well as allowing compliance with the maximum floor drifts that limit seismic damage. It was concluded that the structure with eccentric braced frame presents a better lateral resistance to the action of an earthquake due to the addition of the diagonals, which are responsible for redistributing the lateral forces within the building, lightening the structure and considerably reducing the weight of the elements and the consumption of materials.