Numerical modelling of strain hardening fibre-reinforced composites

Vorel J. ; Boshoff W.P. (2010)

Conference Paper

Conventional concrete suffers in most cases from insufficient tensile strength and ductility. Strain Hardening Cement-based Composite is a type of High Performance Concrete (HPC) that was engineered to overcome these weaknesses. In comparison to conventionally reinforced concrete, SHCC demonstrates fine, multiple cracking under tensile loading which can be seen as a noticeable advantage from a durability point of view. The primary objective of the presented research is to develop a constitutive model that can be used to simulate structural components with SHCC under different types of loading. In particular, the constitutive model must be efficient and robust for large-scale simulations while restricted number of material parameters is needed. For the modelling of specific behaviour in tension, the application of classical material models used for quasi-brittle materials is not straightforward. The proposed numerical model is based on a rotating crack assumption to capture specific characteristics of SHCC, i.e. the strain hardening and softening, the multiple cracking and the crack localization. The multiple orthogonal crack patterns are allowed which is in accordance with the observations presented in Suryanto et al. (2008). The accuracy of the developed model is investigated by the comparison of the numerical results with experimental data. © 2010 Taylor & Francis Group, London.

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