Blog

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 = 23 in., three galvanized No. 8 Grade 60 bars placed in the top of the beam, and No. 4 Grade 60 stirrups located every 6 in. along the span. Assume 5,000-psi normal-weight concrete and a clear cover of 2 in.

A simply-supported beam has a 4 kip/ft uniformly-distributed load over the entire 8-ft span. What is the magnitude of the shear force at midspan?

Hooks are used to provide additional anchorage when there is insufficient _______ available to develop a bar.

For economy, some of the bars can be terminated or cutoff where they are no longer needed.

Determine the lightweight modification factor, λ, for a rectangular beam with b = 17 in. and d = 22 in., five epoxy-coated No. 6 Grade 60 tension-reinforcement bars placed in the bottom of the beam, and No. 3 Grade 40 stirrups located every 6 in. along the span. Assume 8,000-psi lightweight concrete and a clear cover of 1.5 in.

Determine the casting-position modification factor, ψt, for a rectangular beam with b = 17 in. and d = 21 in., three galvanized No. 9 Grade 60 tension-reinforcement bars placed in the top of the beam, and No. 3 Grade 40 stirrups located every 8 in. along the span. Assume 6,000-psi lightweight concrete and a clear cover of 2 in.

A rectangular beam with cross section b = 14 in., h = 22 in., and d = 19.5 in. supports a total factored uniform load of 1.70 kips/ft, including its own dead load. The beam is simply supported with a 18-ft span. It is reinforced with four No. 5 Grade 60 bars, two of which are cutoff between midspan and the support and two of which extend 10 in. past the centers of the supports. The concrete strength is 7,200 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. The strength of the four bars is φMn = 106.4 kip-ft, and the strength of the remaining two bars is φMn = 53.8 kip-ft. If the distance from the support to the theoretical cutoff point is 4.792 ft, determine the distance from the support to the actual cutoff point (i.e. use ACI 318-14 Section 9.7.3.3).

Determine the lightweight modification factor, λ, for a rectangular beam with b = 16 in. and d = 23 in., five galvanized No. 8 Grade 60 tension-reinforcement bars placed in the top of the beam, and No. 3 Grade 60 stirrups located every 8 in. along the span. Assume 6,000-psi normal-weight concrete and a clear cover of 2 in.

Mario: Julia, amiga mía, ¿cuál es [q24] película favorita?

Determine the casting-position modification factor, ψt, for a rectangular beam with b = 16 in. and d = 20 in., five galvanized No. 7 Grade 60 tension-reinforcement bars placed in the bottom of the beam, and No. 4 Grade 40 stirrups located every 10 in. along the span. Assume 5,000-psi normal-weight concrete and a clear cover of 1.5 in.