Title:
Behavior of Fiber Reinforced High-Strength Concrete Under Direct Shear
Author(s):
Mariano Valle and Oral Buyukozturk
Publication:
Materials Journal
Volume:
90
Issue:
2
Appears on pages(s):
122-133
Keywords:
fibers; high-strength concretes; polypropylene fibers; shear strength; shear stress; Materials Research
DOI:
10.14359/4006
Date:
3/1/1993
Abstract:
This paper reports the results of an investigation on the strength and ductility of fiber reinforced high-strength concrete under direct shear. Both experimental and modeling studies were performed. In the experimental study, fiber reinforced high-strength concrete push-off specimens were tested. Two types of fibers, polypropylene and steel fibers, in conjunction with or without conventional stirrups were used. An existing model was developed further and used in the analytical prediction of the shear stress-strain relationships for these specimens. In general, fibers proved to be more effective in high- strength concrete than in normal strength concrete, increasing both ultimate load and overall ductility. This is attributed to the improved bond characteristics associated with the use of fiber in conjunction with high- strength concrete. For the specimens with steel fibers, significant increases in ultimate load and ductility were observed. With polypropylene fibers, a lower increase in ultimate load was obtained compared to the increase due to steel fibers. Ductility of the polypropylene fiber reinforced specimens was greater than that of the steel fiber reinforced specimens. In the tests involving the combination of fibers and conventional stirrups, there were slight increases in ultimate load while major improvements in ductility were observed, in comparison to the values for plain concrete specimens with conventional stirrups. In general, good agreement between the model and the test results was found.