THE ELASTOPLASTIC CONCRETE STRAIN INFLUENCE ON THE CRACKING MOMENT AND DEFORMATION OF RECTANGULAR REINFORCED CONCRETE ELEMENTS

Abstract

The calculation of cracking moment of flexural reinforced concrete elements is made in the article by evaluating the elastoplastic state of concrete. At the time of crack opening, the concrete strain modulus is calculated on the ground of the coefficient of elastoplastic strains. It is accepted in the calculations that, when stresses reach maximal values, the coefficient of concrete elastoplastic strains is the same for both tensile and compressive zone. The presented model can be used to calculate the stress and strain values of uncracked element section with regard to bending moment not exceeding cracking moment. In this case, it is taken that when stresses exceed elasticity limit the coefficient of elastoplastic strain will decrease gradually to the limit value if maximal stresses are reached. In order to simplify the solution of formed integral equations, the method of layers and the finite element method are proposed for solving. The proposed method is convenient because it can easily be used to evaluate the potential changes of concrete elastoplastic coefficients.

DOI: http://dx.doi.org/10.5755/j01.mech.19.1.3619