Behavior of Fiber Reinforced High Strength Concrete Under Direct Shear


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Title: Behavior of Fiber Reinforced High Strength Concrete Under Direct Shear

Author(s): Mariano Valle and Oral Buyukozturk

Publication: Special Publication

Volume: 142


Appears on pages(s): 201-234

Keywords: ductility; fiber reinforced concretes; metal fibers; high-strength concretes; loads (forces); models; polypropylene fibers; shear properties; stirrups; strength; tests; Materials Research

Date: 1/1/1994

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 pushoff specimens were tested. Two fiber types, polypropylene and steel, were used with or without conventional stirrups. An existing model was further developed 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 fibers 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 when 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, slight increases in ultimate load and major improvements in ductility were observed when compared to the values for plain concrete specimens with conventional stirrups. In general, good agreement between the model and the test results was found.