Torsional Behavior of High-Strength Concrete Beams with Lower Amounts of Torsional Reinforcement

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Title: Torsional Behavior of High-Strength Concrete Beams with Lower Amounts of Torsional Reinforcement

Author(s): I.-K. Fuang and H.-J. Chiu

Publication: Special Publication

Volume: 228

Issue:

Appears on pages(s): 741-768

Keywords: beams; high-strength concrete; reinforced concrete; shear;structure design; torsion

Date: 6/1/2005

Abstract:
Experimental investigation was conducted to study the pure torsional behavior of sixteen high- (HSC) and normal-strength concrete (NSC) full-size beams with relatively low amounts of torsional reinforcement. The test specimens had variable levels of transverse and longitudinal reinforcements, compressive strength of concrete and aspect ratio of the cross section. The overall behavior, with emphasis on the post-cracking reserve strength, is reported. It was found that the adequacy of post-cracking reserve strength for specimens with the minimum amount of torsional reinforcement specified in the ACI 318-02 is primarily related to the ratio of ?t /?l . Nevertheless, the lower limit of ?total = 1 % should not be ignored. A simple approach to determine the minimum amount of torsional reinforcement is discussed and confirmed by the test results to facilitate the design of torsion for HSC and NSC beams.