Blog

Assuming Vs does not exceed 4sqrt(f’c)bwd, the maximum spacing for vertical stirrups in the following beam is _____. Let b1 = 22 in., b2 = 12 in., d = 57 in., h1 = 6 in., h2 = 46 in., h3 = 10 in., and t = 7 in. There are six No. 9 longitudinal tension bars and No. 5 stirrups at 11 in. o.c.

If φVc = 23 kip and Vu = 63 kip, are stirrups required?

A rectangular beam with cross section b = 14 in., h = 24 in., and d = 21.5 in. supports a total factored uniform load of 1.60 kips/ft, including its own dead load. The beam is simply supported with a 19-ft span. It is reinforced with five No. 5 Grade 60 bars, three 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 6,900 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 five bars is φMn = 146 kip-ft, and the strength of the remaining two bars is φMn = 59.35 kip-ft. If the distance from the support to the theoretical cutoff point is 5.492 ft, determine the distance from the support to the actual cutoff point (i.e. use ACI 318-14 Section 9.7.3.3).

If φVc = 18 kip and Vu = 34 kip, are stirrups required?

At a point subjected to plane stress, the stresses are σx = –10 ksi, σy = 25 ksi, and τxy = 20 ksi. Determine the angle θp corresponding to the orientation of the principal planes at the point.

Assuming Vs does not exceed 4sqrt(f’c)bwd, the maximum spacing for vertical stirrups in the following beam is _____. Let b1 = 26 in., b2 = 12 in., d = 59 in., h1 = 4 in., h2 = 51 in., h3 = 9 in., and t = 7 in. There are six No. 7 longitudinal tension bars and No. 3 stirrups at 11 in. o.c.

A 122-mm-long beam supports a load of P = 27 N at midspan. The cross section is rectangular with width b = 29 mm and height h = 40 mm. Determine the magnitude of the horizontal shear stress at the centroid of the cross section.

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 = 16 in. and d = 20 in., three uncoated No. 8 Grade 60 bars placed in the top of the beam, and No. 3 Grade 60 stirrups located every 8 in. along the span. Assume 5,000-psi normal-weight concrete and a clear cover of 1.5 in.

Determine the transverse reinforcement index, Ktr, for a rectangular beam with b = 17 in. and d = 24 in., four epoxy-coated 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 8,000-psi lightweight concrete and a clear cover of 1.75 in.

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 = 16 in. and d = 24 in., three uncoated No. 7 Grade 60 bars placed in the bottom of the beam, and No. 4 Grade 40 stirrups located every 10 in. along the span. Assume 4,000-psi lightweight concrete and a clear cover of 1.75 in.