Title:
Performance of Welded Wire Fabric as Shear Reinforcement Under Cyclic Loading
Author(s):
Jose A. Pincheira, Sami H. Rizkalla and Emmanuel K. Attiogne
Publication:
Structural Journal
Volume:
86
Issue:
6
Appears on pages(s):
728-735
Keywords:
anchorage (structural); beams (supports); cyclic loads; T-beams; crack width and spacing; ductility; fatigue (materials); prestressed concrete; reinforced concrete; shear strength; stirrups; web reinforcement; welded wire fabric; Structural Research
DOI:
10.14359/2770
Date:
11/1/1989
Abstract:
The performance of welded wire fabric (WWF) as shear reinforcement in prestressed and reinforced concrete T-beams subjected to cyclic loading is investigated and compared to that of conventional stirrups. Ultimate strength, ductility, crack-width control, and anchorage of the web reinforcement were used to evaluate the effectiveness of the WWF as shear reinforcement. Test results indicate that WWF provides a slightly better control of crack width in comparison to an equivalent amount of either single- or double-legged stirrups. Anchorage of WWF provided by two horizontal wires at the top and bottom of the vertical wires appears to be adequate under cyclic loading. However, premature fracture of the vertical wires at the welded intersections reduced the ultimate strength of the member in comparison to that of the beams reinforced with conventional stirrups. Test results also show that the current provisions of the ACI Building Code overestimate the shear load corresponding to the initiation of diagonal cracking for members subjected to cyclic loading. Therefore, the use of a minimum amount of web reinforcement should be mandatory when repetitive loading is expected.