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-The results of the investigation of the behavior of planar reinforced concrete opening corner joints made up of plain and steel concrete are presented and discussed. Conventional arrangements of detailing corner rebars have been shown to be structurally inadequate and an innovative but simple detailing of opening corners has been proposed which gave corner efficiencies in the range of 90 to 95%. The mechanics of opening corners were studied with the help of an assumed length of the critical diagonal crack and a simplified distribution of tensile stress at imminent cracking and it is shown that for optimum performance corner joints should be kept lightly reinforced with the amount of reinforcement being preferably less than 0.47%.However, for practical considerations, it has been shown that even at 0.76% of steel content, corner efficiencies of about 90% may still be obtained with the recommended detailing. Limited number of tests indicate that diameter of tension reinforcement has an insignificant effect on corner efficiency.

Investigations on Reinforced Concrete Corner Joints Under Bending Moment