MODELING OF THE STRESS-STRAIN STATE OF REINFORCED CONCRETE BEAMS WITH ASYMMETRIC DAMAGE IN THE LIRA-SAPR SOFTWARE COMPLEX

Abstract

The article describes the study of the stress-strain state of damaged reinforced concrete beams. To solve the research problem, 10 digital models of reinforced concrete beams (B-0...B-9) were created, including one control beam and nine beams with different sizes of asymmetric damage. Modeling and calculation were carried out in the LIRA-CAD software complex. Volumetric finite elements No. 236 were used to construct the finite-element model, which simulates the non-linear operation of concrete. The 25-exponential law of deformation was used to model the non-linear operation of concrete. Finite elements No. 210 were used to simulate the operation of the reinforcement carcass - physically nonlinear universal spatial FE. The 14th piecewise linear deformation function was used to determine the physical nonlinearity of the reinforcement material. For further detailed study and analysis of reinforced concrete beams with uneven damage, 9 damage variants with variable values of damage height and width were simulated. It started from 12.5 mm to 62.5 mm. These variations cover several different damage scenarios from minor to major, allowing the moment of departure of the beam from the plane of normal bending to be investigated. As a result of this study, data were obtained on the change (increase) of stresses and deformations with an increase in the size of the damage. The size of the damage, at which the model of the reinforced concrete beam leaves the plane, is also recorded.