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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 = 24 in., three uncoated No. 6 Grade 60 bars placed in the bottom of the beam, and No. 4 Grade 40 stirrups located every 12 in. along the span. Assume 8,000-psi lightweight concrete and a clear cover of 1.5 in.

Determine the transverse reinforcement index, Ktr, for a rectangular beam with b = 16 in. and d = 22 in., four galvanized No. 9 Grade 60 tension-reinforcement bars placed in the top of the beam, and No. 3 Grade 40 stirrups located every 10 in. along the span. Assume 7,000-psi lightweight concrete and a clear cover of 2 in.

Determine the lightweight modification factor, λ, for a rectangular beam with b = 17 in. and d = 22 in., four uncoated No. 7 Grade 60 tension-reinforcement bars placed in the top of the beam, and No. 3 Grade 40 stirrups located every 10 in. along the span. Assume 6,000-psi lightweight concrete and a clear cover of 1.5 in.

There are a number of basic concepts when deciding when to use cutoffs in a concrete beam. All of the following are valid EXCEPT _______.

Determine the lightweight modification factor, λ, for a rectangular beam with b = 16 in. and d = 21 in., three epoxy-coated No. 7 Grade 60 tension-reinforcement bars placed in the bottom of the beam, and No. 4 Grade 40 stirrups located every 12 in. along the span. Assume 5,000-psi lightweight concrete and a clear cover of 1.5 in.

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

Determine the bar-spacing factor, cb, for a simply supported rectangular beam with b = 22 in. and No. 3 stirrups. This beam has three No. 7 bars as longitudinal reinforcement. The clear cover is 2 in.

Determine the epoxy modification factor, ψe, for a rectangular beam with b = 18 in. and d = 21 in., five uncoated No. 6 Grade 60 tension-reinforcement bars placed in the top of the beam, and No. 3 Grade 40 stirrups located every 6 in. along the span. Assume 4,000-psi normal-weight concrete and a clear cover of 1.75 in.

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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 = 24 in., three uncoated No. 6 Grade 60 bars placed in the top of the beam, and No. 3 Grade 60 stirrups located every 12 in. along the span. Assume 4,000-psi lightweight concrete and a clear cover of 1.5 in.