Page 323 - 2018_IRC

WALL CONSTRUCTION

TABLE R608.7(4)
REDUCTION FACTOR FOR DESIGN STRENGTH, R , FOR FLAT, WAFFLE- AND SCREEN-GRID WALLS a, c
3
VERTICAL BARS AT EACH END OF REDUCTION FACTOR, R 3 , FOR LENGTH OF SOLID WALL
NOMINAL SOLID WALL SEGMENT VERTICAL
THICKNESS OF REINFORCEMENT Horizontal and vertical shear reinforcement provided
WALL LAYOUT DETAIL No Yes d
(inches) Number of bars Bar size [see Figure R608.7(2)]
40,000 b 60,000 b 40,000 b 60,000 b
Flat walls
2 4 1 0 . 7 4 0.61 0.74 0.50
3 4 2 0 . 6 1 0.61 0.52 0.27
4
2 5 1 0 . 6 1 0.61 0.48 0.25
3 5 2 0 . 6 1 0.61 0.26 0.18
2 4 3 0.70 0.48 0.70 0.48
3 4 4 0 . 4 9 0.38 0.49 0.33
6
2 5 3 0 . 4 6 0.38 0.46 0.31
3 5 4 0.38 0.38 0.32 0.16
2 4 3 0.70 0.47 0.70 0.47
3 4 5 0.47 0.32 0.47 0.32
2 5 3 0.45 0.31 0.45 0.31
8
4 4 6 0 . 3 6 0.28 0.36 0.25
3 5 5 0 . 3 1 0.28 0.31 0.16
4 5 6 0.28 0.28 0.24 0.12
2 4 3 0.70 0.47 0.70 0.47
2 5 3 0.45 0.30 0.45 0.30
4 4 7 0.36 0.25 0.36 0.25
10
6 4 8 0 . 2 5 0.22 0.25 0.13
4 5 7 0 . 2 4 0.22 0.24 0.12
6 5 8 0.22 0.22 0.12 0.08
Waffle-grid walls e
2 4 3 0.78 0.78 0.70 0.48
3 4 4 0.78 0.78 0.49 0.25
6
2 5 3 0.78 0.78 0.46 0.23
3 5 4 0.78 0.78 0.24 0.16
2 4 3 0.78 0.78 0.70 0.47
3 4 5 0.78 0.78 0.47 0.24
2 5 3 0.78 0.78 0.45 0.23
8
4 4 6 0.78 0.78 0.36 0.18
3 5 5 0.78 0.78 0.23 0.16
4 5 6 0.78 0.78 0.18 0.13
Screen-grid walls e
2 4 3 0.93 0.93 0.70 0.48
3 4 4 0.93 0.93 0.49 0.25
6
2 5 3 0.93 0.93 0.46 0.23
3 5 4 0.93 0.93 0.24 0.16
For SI: 1 inch = 25.4 mm, 1,000 pounds per square inch = 6.895 MPa.
a. See Note e to Table R608.7(1A) for application of adjustment factors in this table.
b. Yield strength in pounds per square inch of vertical wall reinforcement at ends of solid wall segments.
c. Values are based on concrete with a specified compressive strength, ƒ' , of 2,500 psi. Where concrete with ƒ' of not less than 3,000 psi is used, values in
c
c
shaded cells are permitted to be decreased by multiplying by 0.91.
d. Horizontal and vertical shear reinforcement shall be provided in accordance with Section R608.7.2.2.
1
e. Each end of each solid wall segment shall have rectangular flanges. In the through-the-wall dimension, the flange shall be not less than 5 / 2 inches for 6-inch-
nominal waffle- and screen-grid walls, and not less than 7 / 2 inches for 8-inch-nominal waffle-grid walls. In the in-plane dimension, flanges shall be long
1
enough to accommodate the vertical reinforcement required by the layout detail selected from Figure R608.7(2) and provide the cover required by Section
R608.5.4.1. If necessary to achieve the required dimensions, form material shall be removed or use of flat wall forms is permitted.

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