Shear strength prediction—softened truss model - Reinforced Concrete Deep Beams - page 173

Figure 7.6 Comparison of calculated and experimental shear strength
7.4 Parametric study
Parametric studies will now be carried out to investigate the variation of
shear strength with respect to the important factors involved. A close
examination of the governing Eqns (7.6)-(7.10) reveals that the normalised
shear strength is mainly affected by the two dimensionless
parameters and Together with the parameter a/h inherent in
K, these three parameters represent the amount of longitudinal
reinforcement, the amount of transverse reinforcement, and the geometry of
the beam, respectively. The first two parameters may be called the
longitudinal reinforcement index and the transverse reinforcement index.
7.4.1 Shear-span-to-height ratio
The four curves in Figure 7.9 show the variation of the shear strength with
respect to the shear-span-to-height ratio. Because each curve represents a
different amount of reinforcement in the beam the four curves together
cover the practical range of longitudinal and transverse reinforcement
ratios. For transverse reinforcement, the minimum percentage is 0.0025