A CONSTITUTIVE LAW OF REINFORCED CONCRETE PLATE ELEMENT UNDER BIAXIAL STRESS STATES AND ITS APPLICATION TO REINFORCED CONCRETE MEMBERS SUBJECTED TO TORSION

Abstract

Biaxial compressive-tensile tests were conducted on reinforced concrete plate members. In the average stress average strain curves, steel starts to yield below its yield strength and the length of yield plateau is zero. In addition, the relationships between average tensile stress and average tensile strain on concrete at biaxial compressive-tensile stress states is different from those in uniaxial tensile stress states. Constitutive equations of steel and concrete in reinforced concrete plate element under biaxial stress states are proposed. These equations are then applied to the analysis of torsional behaviours of reinforced concrete members. The experimental and analytical values on the members subjected to torsion are found in good agreement.