Methodological System to Describe Uniaxial Ratcheting Behavior of HRB400Ⅲ Aseismic Reinforced Bars

An experimental study was carried out on the cyclic ratcheting of HRB400Ⅲ aseismic reinforced bars subjected to asymmetric cyclic loading at room temperature.The effects of stress amplitude,mean stress and stress rate on HRB400Ⅲ aseismic reinforced bars were investigated completely.The experimental results indicated that increase of either stress amplitude or mean stress increased the ratcheting strain accumulated in the material.Under low stress amplitude,the intragranular back stress would hinder the accumulation of ratchet strain,meanwhile,ratcheting strain increased with the increase of stress rate.However,at high stress rate,the fatigue life of the material increased.During asymmetric cyclic loading,the strain energy density increased with the increase of stress amplitude and average stress.The material showed obvious cyclic hardening characteristics under cyclic loading.