Caracterización físico-mécanica de acero de refuerzo estructural para niveles de desempeño de prevención de colapso : ensayo BBT en varillas de diámetro 8MM, 10MMM, 12MM.

Abstract

In the construction industry, selecting appropriate materials for structural reinforcement is fundamental, especially in earthquake-prone areas where seismic-resistant design is crucial. This research sought to experimentally characterize the seismic performance level of reinforcement bars in reinforced concrete elements. The study focused on bars with diameters of 8, 10, and 12 mm, evaluating the fracture of buckled bars as the performance level. The experimental studies conducted included tension tests on bars to determine the yield stress and BBT (Buckled Bar Tension) tests, which consist of subjecting a reinforcement bar specimen to a compression load from an imposed axial displacement until buckling occurs, followed by tensioning it to fracture, seeking a brittle failure. Additionally, the DIC (Digital Image Correlation) methodology was implemented to take high-resolution photographs of the bar before and after deformation for subsequent processing and comparison with manual measurements. The data obtained from the tests were processed and analyzed in Excel, generating axial force-displacement curve graphs that allowed for determining the critical point and evaluating repeatability to ensure the identification of brittle failure. Furthermore, the study obtained the buckled profile, axial deformations, and displacements of the bar from the digital images taken for the DIC methodology.