EXPERIMENTAL STUDY ON SHEAR MECHANISM OF PRESTRESSED CONCRETE T-BEAMS

The technology of prestressed concrete is widely used in structures, prestressed concrete t-beams have complex shear mechanism which is influenced by various factors and not been solved completely. In order to study the influence of flange width, number and bent-up angle of prestressed tendons on the shear bearing capacity of concrete t-beams, nine prestressed concrete t-beams and one ordinary reinforced concrete t-beam were designed and manufactured. The crack development, failure pattern, mid-span deflection, concrete strain, stirrup strain and crack width of prestressed concrete t-beams were measured and analyzed. The results showed that the internal force and shear bearing capacity of t-beams can be increased by changing the flange width and the level of prestress force, and improved the shear mechanism. This study has a reference value to reveal the shear failure mechanism of prestressed concrete t-beam under concentrated load.