BCN 4431 Spring 2019
Due: April 19, 2019 at 5:00 PM
INSTRUCTIONS: All the steps must be clearly shown. Whenever a value or any other
information comes from book or code, table number and/or page number should be clearly
mentioned. If any value that you need for calculations is not given, assume and state the basis of
your assumption (based on book, reasoning etc.).
(If your PID is “5684659”, then A = 5, B = 6, C = 8, D = 4, E = 6, F = 5 and G = 9. Interpret
4.G as 4.9 in this example)
1. (5 points) Determine Mn for a beam of cross section shown in figure 1, where f’c = 4 ksi.
Assume fy = 60 ksi. Calculate the strain on steel when the concrete strain is 0.003 and
compare it with yield strain of steel. Es = 29x103 ksi
2. (5 points) Determine if the beam shown in the figure is adequate as governed by the ACI
Code (318-11). The loads shown are service loads. The uniformly distributed load is DL =
0.65 + 0.F = _________ kip/ft, LL = 0.55 + 0.E = ________ kip/ft. The dead load excludes
the beam weight. The point load is a live load. f’c = 3,000 psi, fy = 40,000 psi.
In case you find that the section is not tension-controlled, use the closest value of ݇. ONLY
FOR THE SAKE OF SIMPLIFYING THIS PROBLEM, SHOULD NOT BE FOLLOWED
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