In order to evaluate the safety levels of the design of reinforced concrete structures it is essential to be able to predict their response under any type and level of loading. To this end the finite element method of analysis may be used. For such an analysis to be realistic, one must take into account all aspects of the nonlinear behaviour of reinforced concrete.
A simple smeared crack material model for concrete behaviour [
], which is based on experiments and uses the uniaxial compressive concrete strength as the only prerequisite has been used recently by the authors to analyze structures loaded statically and dynamically ([
]). A numerical method that treats crack opening and closure in a unified way and presents no numerical instability has been presented. Steel bars are taken into account using an embedded reinforcement formulation [
] and assuming perfect bond with surrounding concrete.
The latter assumption is avoided in the present paper with an additional degree of freedom. A realistic model [
] is used to describe the interface behaviour along a reinforcing bar. Comparative analyses of the model with and without bar slipping are performed for static loading cases. The analyses show that the whole procedure manages to give stable and realistic results. This enhanced, therefore, oneparameter concrete model may be used in the analysis of reinforced concrete structures more effectively.