Appendix B:Model for Single Crack Extension in Lightly Reinforced Beams

Abstract

In this appendix the failure behaviour of lightly reinforced concrete beams is investigated. A numerical model based on the fictitious crack approach according to Hillerborg [1] is established in order to estimate the load-deflection curve for lightly reinforced concrete beams. The debonding between concrete and reinforcement is taken into account by introducing a debonded zone with constant shear friction stress. Results are presented for material models representing normal strength concrete (two degrees of brittleness) and high strength concrete. The properties of the model are investigated and the results of the model are compared with results from experiments.In this appendix the failure behaviour of lightly reinforced concrete beams is investigated. A numerical model based on the fictitious crack approach according to Hillerborg [1] is established in order to estimate the load-deflection curve for lightly reinforced concrete beams. The debonding between concrete and reinforcement is taken into account by introducing a debonded zone with constant shear friction stress. Results are presented for material models representing normal strength concrete (two degrees of brittleness) and high strength concrete. The properties of the model are investigated and the results of the model are compared with results from experiments