CE479 Fall 2009 Final Exam Submit your note sheet with your exam. Happy Holidays!

Name_________________________________________PUID (last 5 digits) _____________________

1. (30 points) The single story commercial building shown below uses 15/32 in. Structural I

sheathing. Assume this is adequate for sheathing loads. Consider lateral forces (seismic) in the transverse direction, wTU = wT = 300 lb/ft and the longitudinal direction, wLU= wL = 800 lb/ft. All framing is Spruce-Pine-Fir.

a. Determine the maximum chord force b. Determine the maximum collector force. (Note: ignore the ‘small’ wall segments in the

North and West walls) c. Assume a double 2x4 top wall plate, dry conditions, normal temperatures. Determine

the number of 10d sinker nails necessary to splice the top plate for the maximum force (tension or compression) determined in (a) or (b).

N

2. (20 points) A simply supported, 30 ft long joist has a uniformly distributed superimposed dead

load, wD = 50 lb/ft, and a uniformly distributed live load, wL = 100 lb/ft. Estimate 15 lb/ft for

joist self-weight.

a. Assuming that load combination 1.2D + 1.6 L controls and using a live load deflection

limit of L/450, select the lightest K-series joist.

b. Consider the addition of a concentrated load, Pu = 500 lb, at midspan. Using the “SP”

designation, specify an appropriate “K” series joist. (No deflection limit.)

3. (20 points) Consider a 1.5F deck with 5/8” puddle welds to supports. Supports are at 7’-0”

o.c. Fastener layout is 36/4, and the deck is 18 gauge. There are 5 welded sidelap fasteners per

span. The span of the diaphragm is 90 ft. The orthogonal dimension is 60 ft.

a. Assume a 3-span condition and Fy = 33 ksi. Compare the allowable total load (psf) given

in the table to the SDI requirements for maximum working stress. Assume uniformly

distributed loads.

b. Determine the maximum unit shear capacity (lb/ft) and the corresponding maximum

diaphragm load (lb/ft)

c. Suppose the diaphragm load is 150 lb/ft. What is the deflection at the centerline?

4. (30 points) Consider a grouted clay brick (nominal 4 in. high) masonry beam as

shown with a simply supported span of 15 ft. The wall above the opening is 12

ft. high. A floor load at 5 ft above the lintel is 400 lb/ft dead load and 200 lb/ft

live load. Assume that the 1.2D + 1.6L load case controls. f’m = 3000 psi, Type

N portland cement mortar, running bond, and reinforcement with a yield

strength of 40,000 psi. Assume 90 psf for weight of the wall/beam.

Determine (a) the number of courses required (assume 5 courses to start)

(b) amount of reinforcement required for a fully grouted beam (use 5

courses for the height of the beam regardless of your answer to (a))