Ultimate torque of reinforced concrete beams with web opening

An analytical model for the prediction 4 ultimate torsional strength of reinforced cement concrete beams containing web opening is presented. Test results ofsome reinforced concrete (RC) T-beams with web opening are also furnished. It is observed that the present model gives consistently good results for rectangular RC beams with web opening. It is also found that the present model can be applied to R C T-beams with web opening. R C T-beams with web opening, like the rectangular beams with web opening, are found to fail by the formation ofplastic hinges at the corners of the chord members forming the opening(s).