Modelling Cyclic Plasticity of Structural Steels

In this paper we propose a cyclic plasticity model with high accuracy to predict elasto-plastic behaviors of uniaxial steel members subjected to complicated repetitive loads. The model is based on the multi surface plasticity model and material property parameters introduced are a couple of fundamental surface size functions and weighting functions to describe sizes of state surfaces at arbitrary stress-strain phases. It is revealed that the hysteretic model proposed, by which quasi-static fluctuating stressstrain relations can be predicted, is sufficiently accurate from the engineering point of view.