Title: Shear Strength of Beams Without Web Reinforcement Containing Deformed Bars of Different Yield Strengths
Author(s): Robert G. Mathey and David Watstein
Publication: Journal Proceedings
Appears on pages(s): 183-208
The behavior of reinforced concrete beams failing in shear was investigated in a series of tests in which the shear span to depth ratio and the ratio of reinforcement were varied. Six types of deformed bars with nominal yield strengths ranging from 40,000 to 100,000 psi and different stress-strain characteristics were used as tensile reinforcement. The diagonal tension crack formed in all beam specimens at stresses in the reinforcement which were within the range that was essentially elastic. For beams with the same shear span to depth ratio, the shear strengths at diagonal tension cracking decreased roughly linearly as the corresponding maximum stresses in the reinforcement increased. An empirical formula is presented for estimating the shear strength corresponding to the diagonal tension cracking load of beams rectangular in cross section without web reinforcement. The shear strengths developed in the beam specimens are compared with values given in the 1956 ACI Building Code and with values computed from the formula recently proposed by ACI-ASCE Committee 426 (236), Sh ear und Diagonal Tension.