Bond anchorage of straight and hooked reinforcing bars

This work focuses on the bond behavior of large diameter bars with hooks embedded in short reinforced concrete joints. The research has three parts. First an experimental work with a reinforced concrete specimen has been conducted. In the next step a finite element analysis was carried out. In order to perform an accurate analysis a bond-slip model was proposed. To accelerate the analysis the proposed model was automated. Good agreement was found between the results from the proposed approach and the literature test results. A parametric study of a series of reinforced concrete models with hooked bars was carried out and the results were used for a comparison with CSA-A23.3 code provisions for hook development. Recommendations for improvement in design have been presented. Finally, conclusions and suggestions for future research have been presented.; As for experimental work a reinforced concrete joint under closing moments was tested. Load was applied using MTS-6000 machine with displacement control type of loading.; Finite element analysis was carried out using explicit quasi static analysis with three dimensional elements for concrete and steel. A bond-slip model was developed to define the interaction at the steel-concrete interface. The proposed bond model accounts for strength of concrete, bar diameter, concrete cover and level of confinement. Verification is done using previous researchers' test results and finite element analyses. The proposed model renders results close to the ones in literature.; A series of reinforced concrete models with large bars hooked into them were studied to determine the effects of bend radius and tail length. Comparison with CSA-A23.3 provisions shows whether or not they are conservative.