Load-deformation curves for reinforced concrete bcams subj ected to bending show size effects due to tensile failure of the concrete at early stages in the failure process and due to compression failure of the concrete when the final failure takes place. In this paper these effects are modelled using fradure mechanical concepts, and size effects of the models are studied and compared with experimental results. KEYWORD S Size effect, bending behaviour, reinforced concrete, minimum reinforcement, rotatianaJ capacity, fracture mechanics. .
In this appendix a brief summary of experiments on reinforced concrete beams in tl1ree-point bending performed at Aalborg University is given. The aim of the investigation is to determine the ful! load-deflection curves for different beam sizes, different types of concrete and different amounts and types of reinforcement, and to calculate the rotatianaJ capacity for all beams. The rotatianaJ capacity is here defined as the non-dimensional area under the load-delleetion curve, and the results are shown as functions of the reinforcement ratio.
Brincker et al. after the concrete tension failure peak seems to be well estimated by the model, indicating that it seems reasonable to assume a constant fridiorral shear stress in the debonded zones at each side o f the crack. References l.
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