ACI 318 provides rules for designing hanger reinforcement.

Larger diameter aggregate creates a rougher crack surface, allowing higher shear stresses to be transferred across cracks.

Assuming Vs exceeds 4sqrt(f’c)bwd, the maximum spacing for vertical stirrups in the following beam is _____. Let b = 16 in. and d = 35 in. There are four No. 7 longitudinal tension bars and No. 5 stirrups at 12 in. o.c.

Determine the size modification factor, ψs, for a rectangular beam with b = 17 in. and d = 24 in., five epoxy-coated No. 9 Grade 60 tension-reinforcement bars placed in the bottom of the beam, and No. 3 Grade 60 stirrups located every 8 in. along the span. Assume 7,000-psi lightweight concrete and a clear cover of 1.75 in.

Axial tension tends to increase shear strength.

Actual bond stresses remain constant between cracks.

The strength-reduction factor, φ, for shear and torsion is 0.75.

When the steel ratio is large, flexural cracks extend higher into the beam and open wider.

When the steel ratio is large, flexural cracks extend higher into the beam and open wider.

Compute φVn for the cross section shown. Assume f’c = 3,500 psi, fyt = 60,000 psi, d = 30 in., w = 20.5 in., t = 6 in., and that there are four No. 6 longitudinal tension bars and No. 5 stirrups at 9 in. o.c.