Reinforced concrete beams were tested to failure in torsion. The same beams were repaired by adhesively bonding steel plates to one side of the beam. The repaired beams showed a 33% increase in strength over the original beams, when subjected to identical loading. The repaired beams all failed in flexure, rather than torsion and showed a deflection 25% less than the original beams. Control beams, externally reinforced before loading, showed a 43% strength increase and also failed in flexure.
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Holman et al. (1984) studied this question.
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