Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

Downloaded From : www.EasyEngineering.net
Design of Wood Members for Formwork 145
Wall Height
above Grade
h, ft
ACI 347
Minimum
100 lb per ft
or 15 lb per
sq ft Wind
Wind Force Prescribed by Local
Code, lb per sq ft
10 20 25 30
4 or less 30 20 40 50 60
6 45 30 60 75 90
8 100 100 100 100 120
10 100 100 100 125 150
12 100 100 120 150 180
14 105 100 140 175 210
16 120 100 160 200 240
18 135 100 180 225 270
20 150 100 200 250 300
20 or more 7.5h 5.0h 10.0h 12.5h 15.0h
Walls below grade
8 ft or less Brace to maintain alignment
More than 8 ft 100 lb per sq ft minimum, or brace for any known
lateral forces that are greater
ww.EasyEngineering.n
Notes:
1. Reprinted from “Formwork for Concrete,” ACI Special Publication No. 4, the
American Concrete Institute.
2. Wind force prescribed by local code shall be used whenever it would require a
lateral force for design greater than the minimum above.
TABLE 5-7 Minimum Lateral Force for Design of Wall Form Bracing, lb per lin ft
FIGURE 5-16
Minimum lateral load for bracing wall form systems.
Downloaded From : www.EasyEngineering.net