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Problems:
1. A 45 ft x 90 ft structure has the openings and shear walls
shown in Figure 14.7 on page 534 (with no rear shear walls).
The roof diaphragm is 13 ft from the base, but this structure
has a parapet wall extending 3 ft past the roof level where
the loads are transmitted. Determine the shear forces in the
shear walls, R1, R2 and R3, when the design wind load is
23 lb/ft2.
Answer: R1 = R2 = 9,832.5 lb, R3 = 9,832.5 lb
2. For the shear wall on the long side (R3) of the building in Problem 1, determine the
overturning moment.
Answer: M0 = 127,822 lb-ft
3. If the shear wall on the long side (R3) of the building in Problem 1 is removed, the diaphragm
can be considered to behave like a deep truss with a distributed load on it. Determine the
maximum force in the top and bottom “chords” from the maximum moment.
Answer: T = C = 4,916 lb
4. You are designing a building in seismic zone 3 which is a large auditorium (>300 occupancy)
(I = 1.25). Z = 0.30, C = 1.25S/T2/3, S =1.2, T = 0.5, RW = 6, and the total dead load = 85,000
lbs. What is the base shear?
Answer: V = 12.6 kips
5. Complete text problem 16.2 on page 588.
6. Complete text problem 16.3 on page 588.
7. Complete text problem 16.4 on page 588. Note: Assume Fv = 14,000 psi. Also, the
numerical answer provided is not correct. It should be 5,093 lb/in2.
= 13 ft
3 ft parapet
= 45 ft
= 90 ft
