[1]
Problem 8.1 from the book A cantilever beam with b =12 in containing 3 No. 7
bars which are anchored in the column by standard 90 hooks. fc =
5 ksi and fs = 60 ksi. Assume that the steel is stressed to
fy at the face of the column, can these bars
- be anchored by hooks into the column. The clear cover to the side of
the hooks is 2.75 in. The clear cover to the bar extension beyond the bend
is 1.875 in. The joint is enclosted by ties at 6 in off center.
- be developed in the beam. The bar ends 2 in. from the end of
the beam. The beam has No. 3 double leg stirrups at 7.5 in.
10 pts. |
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[2]
Problem 8.4 A simply supported rectangular beam with b = 14 in. and d = 17.5
in. an No. 3 minimum stirrups spans 14 ft and supports a total factored
uniform load of 6.5 kip/ft, including its own dead load. It is built of
3000 psi concrete and contains 2 No. 10 grade 50 bars which extend 5 in. past
centers of the supports at each end of No. 3 minimum stirrups. does this
beam satisfy ACI Sec. 12.11.3? If not, what is the largest size bar which
can be used?
10 pts.
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[3]
Design a 14 ft simply supported slab to carry a uniform dead load (exclude
self-weight) of 140 lb/ft2and a uniform live load of
160 lb/ft2. Use fc = 3 ksi and fy =60 ksi.
10 pts.
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[4]
A 17 ft span simply supported beam has a clear span of 16 ft and carries
a uniformly distributed dead and live loads of 5.0 k/ft and 4.0 k/ft,
respectively. The dimensions beam section are 25 in. x 14 in., reinforced
with 4 #10 bars in single row (d = 22.5 in.) and 2 #4 at top of the
beam. Check the section for shear and design the necessary shear
reinforcement. Given fc = 3 ksi and fy = 60 ksi.
10 pts.
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