Uniaxial Constitutive Law for structural concrete members under monotonic and cyclic loads

In this paper, a new constitutive law for concrete is proposed to predict the non-linear behavior of reinforced concrete members. The proposed model is intended to provide improvements on modeling the non-linear hysteretic behavior of concrete structures in the finite element coding. The independent damage and fracture parameters in compression and in tension have been introduced to the constitutive law of concrete degradation, due to increasing loads. In the sample of non-linear monotonic compressive loading, the law has been derived from a basic mathematical model obtained previously. In addition, in the sample of monotonic tension loading, the same law is adopted based on the latter basic mathematical model. The main novelty of the proposed Uniaxial Constitutive Law (UCL) lies in the fact that all the required input data can be obtained through conventional monotonic and cyclic compression and tension tests.