Abstract:Experiment on shrinkage and creep properties of six large size ultra-high strength reinforced concrete columns were carried out. According to the condition of force balance and deformation coordination between concrete and steel, the influence coefficient formula of reinforced concrete creep coefficient is derived. Based on the 209R ACI (1992) creep model, the modified creep prediction model was proposed by introducing the influence coefficient of the strength correction factor and the reinforcement effect coefficient.