Modelling behaviour of high-strength concrete beams

Abstract

The comparative analysis of the own numerical results with experimental results was presented for the examples of the reinforced high-strength concrete beams under static load. The arc-length method was used in combination with Newton- Raphson method to trace the complete response in load-deformation space. The comparison of the obtained results indicates on the correctness of the assumptions and constitutive models of the high-strength concrete and reinforcement steel, and the effectiveness of the solution method. Numerical results of smeared crack patterns are qualitatively agreeable, for the localization, the direction and the concentration with experimental results. The development of strain in outer concrete layer of the compression zone and the development of strain for longitudinal reinforcement have excellent agreement in the most presented cases. The full nonlinear load-deformation at midspan response of the model produced compares well with the experimental response taken from literature. In the presented paper the usefulness of the arc-length method was verifi ed on a spatial numerical model of the reinforced concrete beams with consideration of the concrete softening during compression and tension. The numerical solutions obtained for the reinforced concrete beams are coherent with the experimentally obtained results.