Step 5. Adjust the final spacing to match the top height of the column.
Example Problem 3
Determine the yoke spacing for a 9-foot column whose largest cross-sectional dimension is 36 inches.
Construction materials are 2- by 4-inch and 1-inch sheathing.
Solution Steps:
Step 1. Materials available = 2- by 4-inch and 1-inch sheathing
Step 2. Column height = 9 feet
Step 3. Largest cross-sectional dimension = 36 inches
Step 4. Maximum yoke spacings (refer to Table 3-9 on page 3-25) starting from the base yoke are 8, 8, 10, 11, 12,
15, 17, 17, and 10 inches. The spacing between the top two yokes is reduced due to the limits of the column
height.
LESSON 3
PRACTICAL PROBLEMS
Problem 1: Concrete Wall Form Design
Design the forms for a concrete wail 4 feet high, 40 inches long and 18 inches thick. Two 16-S mixers are
available, each producing 16 cubic feet of concrete every 4 minutes. Materials available are l-inch plywood
sheathing used the strong way, 2-by 4-inch studs, double wales, and 3000# tie rods. The estimated concrete
temperature is 60F.
Problem 2: Concrete Wall Form Deign
Design the forms for a concrete retaining wall that is 120 feet long, 1-foot wide, and 12 feet high. You have an
M919 concrete mobile mixer available and you have estimated your production rate at 12 cubic yards of concrete
per hour. You are to construct the forms from 3/4-inch plywood, 2- by 6-inch studs, 2- by 6-inch double wales,
and No 8 tie wire. The concrete temperature is estimated at 50...F.
Problem 3: Brace Design
Determine the maximum spacing for braces for the wall in Problem No 2. The brace material is 2- by 6-inch by
12-foot. You will have to connect the braces 2 feet below the top of the form. A Natural Trigonometric
Functions (Trig Table) (see Table 3-10) is provided, if needed.
EN5466
3-26
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