Compute φVn for the cross section shown. Assume f’c = 4,000 psi, fyt = 60,000 psi, b1 = 28 in., b2 = 14 in., d1 = 4 in., d2 = 15 in., and that there are three No. 9 longitudinal tension bars and No. 4 stirrups at 10 in. o.c.

Axial compression tends to increase shear strength.

Which symbol represents the bar location factor?

A rectangular beam has a cross section of b = 14 in., h = 30 in., and d = 27.5 in. It is reinforced with two No. 7 Grade 60 bars. The concrete strength is 7,300 psi (normal weight). The beam has Grade 60 No. 3 stirrups satisfying ACI 318-14 Sections 9.7.6.2.2 and 9.6.3.3. Determine the strength φMn for this beam.

Bond stresses must be present where the force in a reinforcement bar changes along its length.

Compute φVn for the cross section shown. Assume f’c = 7,000 psi, fyt = 40,000 psi, b1 = 27 in., b2 = 10 in., d = 27 in., h1 = 7 in., h2 = 16 in., h3 = 9 in., t = 8 in., and that there are six No. 6 longitudinal tension bars and No. 4 stirrups at 9 in. o.c.

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

A rectangular beam has a cross section of b = 14 in., h = 28 in., and d = 25.5 in. It is reinforced with five No. 6 Grade 60 bars. The concrete strength is 5,500 psi (normal weight). The beam has Grade 60 No. 3 stirrups satisfying ACI 318-14 Sections 9.7.6.2.2 and 9.6.3.3. Determine the strength φMn for this beam.

The development length of a reinforcing bar in compression is different than the development length of a similar bar in tension.

A simply-supported beam has a 5 kip/ft uniformly-distributed load over the entire 12-ft span. What is the magnitude of the shear force at midspan?