The Role Of Bond In Shear Transfer Of Shear Critical Reinforced Concrete Slender Beams

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Due to its complex nature, the effect of bond loss between concrete and longitudinal barrnon the shear transfer mechanism lacks a complete framework. So far, all ranges of bondrnlosses are considered as a total bond loss, leaving no gap to address intermediate ranges.rnAdvancement in this area will aid in the assessment of the service life time of variousrnstructures and provide insight for rehabilitative engineers in their efforts. An experimentalrnprogram was undertaken to investigate two ranges of bond losses, complete bond loss andrnbond losses induced by transversal cracks in relation to the effect of the location of thernbond deterioration. rnIn first set Pullout test was used to determine the best approach for bond cutting withoutrncompromising the cracking pattern. This set experimented on the location of the artificialrnbond cut. It included the control beam and two beams with artificial bond cutting materialrncovering 75% of their shear span, with a sole difference being the location of the artificialrnbond cut. The second set experimented on bond losses induced by transversal cracks. Therntransversal cracks were induced by introducing slits and a water proof tape was woundedrnaround the slits to simulate the bond deterioration zone. This set included four beams withrn75% and 50% of their shear span designed to imitate transversal cracks. rnDuring testing, the shear strain at specified points of the 8 beams were measured torncompare the two sets. A number of mold strain gauges were also used in the second set ofrnspecimens to monitor the transfer of shear force to the web. The results of the beamrnspecimens in the first set have attained 90% up to 100% of their flexural capacity, whilernthe control has attained 53% of the flexural capacity. It was also observed that the criticalrndiagonal crack initiation, propagation and location is severely affected by the experimentalrnvariables. Finally, it was observed that the location of the bond cut or bond deteriorationrnresulted in a different effect on the two sets.

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The Role Of Bond In Shear Transfer Of Shear Critical Reinforced Concrete Slender Beams

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