Prestressed Fiber Reinforced Concrete Beams Subjected to Torsion


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Title: Prestressed Fiber Reinforced Concrete Beams Subjected to Torsion

Author(s): F. W. Wafa, A. Hasnat, and O. F. Tarabolsi

Publication: Structural Journal

Volume: 89

Issue: 3

Appears on pages(s): 272-283

Keywords: beams (supports); compressive strength; cracking (fracturing); fiber reinforced concrete; modulus of rupture; prestressed concrete; splitting tensile strength; steel fibers; torsion; torsional strength; torsion tests; Structural Research

Date: 5/1/1992

Reports test results of 18 rectangular axially prestressed and nonprestressed concrete beams with and without fiber reinforcement subjected to torsion. The major parameters of the study were the volume fraction of steel fibers and the prestressing level. The experimental results show that there is no increase inn torsional strength up t 1.0 percent fiber volume content. Beyond this the torsional strength, however, increases with the increasing fiber content but the increase in strength practically levels off again between 1.5 to 2.0 percent fiber content. A variable reduction factor was established and incorporated in the existing skew-bending equations to estimate the torsional strength up to 1.0 percent of prestressed concrete beams containing steel fibers. The modified equations were verified by using the experimental results of other researchers and proved to be satisfactory for similar fibers.