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Compute φVn for the cross section shown. Assume f’c = 3,500 psi, fyt = 40,000 psi, b1 = 24 in., b2 = 12 in., d = 28 in., h1 = 5 in., h2 = 19 in., h3 = 9 in., t = 8 in., and that there are six No. 8 longitudinal tension bars and No. 3 stirrups at 9 in. o.c.

Actual bond stresses remain constant between cracks.

In regards to shear cracks, larger aggregate _______.

Use ACI 318-14 Table 25.4.2.2 to determine the development length for the straight tension bars (no hooks) in a rectangular beam with b = 17 in. and d = 22 in., three uncoated No. 7 Grade 60 bars placed in the top of the beam, and No. 3 Grade 60 stirrups located every 10 in. along the span. Assume 6,000-psi lightweight concrete and a clear cover of 2 in.

Which symbol represents the lightweight-concrete-aggregate factor?

Due to Poisson’s ratio, the diameter of the reinforcing bar decreases as it is loaded in tension and both the bond the adhesion and the friction between it and the concrete are lost.

Compute φVn for the cross section shown. Assume f’c = 4,000 psi, fyt = 40,000 psi, b = 11 in., d = 20 in., and that there are four No. 6 longitudinal tension bars and No. 5 stirrups at 10 in. o.c.

Inclined stirrups are an effective solution for resisting seismic loads.

If the depth of the beam varies, the compressive and tensile forces due to flexure will have vertical components.

Which of the following stirrup designs is not acceptable?