Shear strength of prestressed concrete t-beams with welded wire fabric as shear reinforcement
Robertson, Ian Nicol
Durrani, Ahmad J.
Master of Science
In thin webbed prestressed concrete T-beams, the placement of conventional stirrups is difficult and time consuming. Welded wire fabric appears to provide a relatively economical alternative. In this study, the shear strength of prestressed T-beams reinforced with welded wire fabric as shear reinforcement is investigated. Thirteen large-scale bonded and unbonded prestressed T-beams were tested. The test variables included the type, amount and anchorage conditions of the shear reinforcement. These beams were tested under static third-point loading over a span of eleven feet. In all beams, shear failures occured along shallow diagonal tension cracks at loads in excess of the code predicted values. Anchorage of the welded wire fabric by means of two horizontal wires at top and bottom of the vertical web wires as recommended in the code performed well. However, the quality of the welded wire fabric was found to be critical for satisfactory performance.