Calibración del modelo numérico de una viga de hormigón armado definida para falla por corte

Abstract

Numerical modeling with finite elements has revolutionized civil engineering by permitting the assessment and design of complex structures in a virtual environment. It is essential to properly calibrate the parameters and boundary conditions to accomplish effective optimization. It includes the implementation and examination of concrete and reinforcing steel constitutive models.

The structural behavior of a reinforced concrete beam designed according to ACI 318-19 and tested for shear failure was studied employing analytical models and numerical analysis tools. The aim was to verify the performance of the numerical method, comparing the results obtained by finite element analysis with accurate data from experimental tests.

According to Fuller-Thompson, material tests and concrete design were performed, and the numerical model in Abaqus was calibrated to achieve this objective. This process also involved modeling the geometry, defining boundary conditions, and discretizing finite elements. This comparison revealed a 6.139% load variability and a 7% discrepancy in strain energy between approaches. These procedures enabled the determination of load capacity, stress and strain distribution, and the identification of characteristic crack patterns.

Furthermore, theoretical models proposed to establish the shear strength of concrete were assessed, classifying them as conservative, efficient, and non-conservative.

Finally, the cracking patterns of the experimental and numerical models were compared, highlighting the tensile stress cracks due to bending and shear.