Shear Tests of High- and Low-Strength Concrete Beams with Stirrups

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Title: Shear Tests of High- and Low-Strength Concrete Beams with Stirrups

Author(s): Andrew G. Mphonde and Gregory C. Frantz

Publication: Special Publication

Volume: 87

Issue:

Appears on pages(s): 179-196

Keywords: beams (supports); cracking (fracturing); high-strength concretes; regression analysis; reinforced concrete; research; -- shear strength; shear tests; structural design.

Date: 9/1/1985

Abstract:
Twelve reinforced concrete beams with stirrups were tested to determine their diagonal cracking strengths and ultimate shear capacities. At a constant shear span/depth ratio of 3.6, the stirrup shear strength was equal to 50, 100, or 150 psi (0.34, 0.69, or 1.03 MPa). Within each group the nominal concrete compressive strength varied from 3000 to 12,000 psi (21 to 83 MPa) in otherwise identical specimens. The ACI shear design method was found to be very conservative. A new equations presented to more accurately predict the ultimate shear capacity.