EXPERIMENTS ON SHEAR BEHAVIOR OF PRESTRESSED CONCRETE BEAMS:ANGLES OF PRESTRESSING TENDONS(θ GROUP)

Three PC beams with draped tendons and one RC beam were tested and the primary variable is the angle of the tendons,.All the beams had a shear span to depth ratio,a/h_0,of 2.2.Several results were obtained: beams with both small a/h_0 and normal amount of were inclined to fail in a flexural-shear mode;the greater the ,the faster of the damage of beams.Besides,sectional design methods and modified strut-and-tie model(MSTM) were used to predict the beam shear strengths,and comparisons with test results indicate that sectional methods are not suitable for such predictions but MSTM not only gives accurate results,but also well account for the effect of the angle of the draped tendons.