Evaluación de la vulnerabilidad sísmicas de edificios de concreto armado con irregularidades en planta y altura mediante simulación en Etabs

The objective of this experimental work was to evaluate the seismic vulnerability of reinforced concrete residential structures by comparatively analyzing the influence of plan irregularities (re-entrant corners) and elevation irregularities (soft story). The research arises from the need to determine the extent to which these irregularities influence the seismic performance of structures. Regarding methodology, a quantitative approach was adopted and carried out through numerical simulation using ETABS software. The criteria of the Ecuadorian Construction Standard (NEC-15) were applied for linear analysis, while the ASCE 41-13 standard was used for nonlinear analysis (Pushover) to obtain the performance points of each structure. The experimental work covered the linear and nonlinear analyses of three buildings: Structure 1 (plan irregularity), Structure 2 (soft story with a height of 3.90 m on the ground floor and 4th floor), and Structure 3 (combined irregularity of Structure 1 and 2). The results of the linear analysis evidenced that plan irregularity was the most critical factor. Structure 1 (irregular in plan) and Structure 3 (irregular in elevation and plan) exceeded the inelastic drift limits allowed by NEC-15 (2%), reaching values of 2.39% and 2.55% respectively in the Y-direction. Conversely, Structure 2 (irregular in elevation) maintained drifts within the allowed range at 1.95%. To stabilize Structures 1 and 3, reinforced concrete shear walls with a thickness of 25 cm were implemented, which significantly reduced drifts to permissible values of 1.69% and 1.82%, respectively. Finally, the performance points obtained from the Pushover analysis demonstrated that all buildings reached the expected “Life Safety” (LS) performance level for the design earthquake (rare). It was evidenced that Structure 2 without shear walls (irregular in elevation) presented a larger displacement (22 cm) compared to Structure 1 (irregular in plan) and Structure 3 (irregular in plan and elevation), which showed smaller displacements of 15 cm and 19 cm, respectively. It is concluded that plan irregularities generate higher seismic vulnerability than elevation irregularities in mid-rise buildings, certifying that the use of shear walls as a structural improvement is effective in controlling torsion and guaranteeing the expected seismic performance.

• 1. autor: Núñez Álvarez David Rafael (author)
• Format: bachelorThesis
• Wydane: 2026
• Hasła przedmiotowe: IRREGULARIDAD ESTRUCTURAL; VULNERABILIDAD SÍSMICA; DISEÑO BASADO EN DESEMPEÑO; CURVA DE CAPACIDAD
• Dostęp online: https://repositorio.uta.edu.ec/handle/123456789/46498