Nonlinear Models of Reinforced Concrete Beam Elements with the Actual Reinforcement

Abstract

Abstract The problem of modeling reinforced concrete structures with bar finite elements using a nonlinear material that allows to consider the direct reinforcement is studied. An approach to the creation of a computational model of a reinforced concrete column is proposed, the peculiarity of which is to specify reinforcing bars at the appropriate integration points of the cross-section. As a material of reinforced concrete bar elements, a nonlinear material based on Eurocode-2 is used, which can model the nonlinear behavior of both concrete and reinforcement for different integration points. Numerical experiments were carried out using the LS-DYNA software package. The results of the calculation of the bar reinforced concrete column are compared with the data for the column modeled using solid finite elements with direct reinforcement. In addition, a comparative analysis of the studied column with the results of full-scale tests is performed. Studies have shown good convergence of stresses, strains, and displacements, as well as the coincidence of the value of the ultimate breaking load and the similar nature of the destruction of the reinforced concrete column.