Computational modelling of Strain-Hardening Cement Composites (SHCC)
Strain-Hardening Cement Composites (SHCC) are designed to combine crack control and robust mechanical resistance in a durable construction material. Constitutive models that capture the dominating mechanisms of mechanical and time-dependent behaviour of this class of construction materials are essential for accurate structural analysis. Such models may be complex in order to capture the complex behaviour of fibre-reinforced cement-based construction materials. However, the value of such models lies in the ability it affords the specialist to predict structural behaviour beyond that measured in physical experiments, which is a cost-effective extension of physical experimental data. With the aid of such complex models, thorough understanding and eventual simpler analytical models can be derived. This paper describes a constitutive model for fibre-reinforced strain-hardening cement composites. In the derivation of the failure criteria and their dependence on strain hardening/softening, reference is made to results of characterising tests, including uniaxial tension and compression tests, shear tests, rate tests, as well as creep loads. The model is based on multi-surface, anisotropic, rate-dependent, computational continuum plasticity. Verification of the model is presented by analysis of two series of laboratory tests, namely SHCC and steel bar reinforced SHCC tested in flexure, and SHCC specimens tested in shear. © 2010 Taylor & Francis Group, London.