VERTICAL REINFORCEMENT FOR BACKFILLED WALLS

Meets CABO One and Two Family Dwelling Code Section R-304
Wall Height = 10'-0" or less, Axial Loads applied to center of wall, lbs/ft.

Backfill Equivalent Fluid Pressure = 30 psf/ft. of depth1

Concrete= 3,000 psi Rebar = 60,000 psi

Concrete= 3,000 psi Rebar = 40,000 psi

Height of Backfill

6" Forms

8" Forms

6" Forms

8" Forms

Reinforcing

Axial Load

Reinforcing

Axial Load

Reinforcing

Axial Load

Reinforcing

Axial Load

5'

#4@24

5000.00

#4@24

20000.00

#4@24

1400.00

#4@24

20000.00

5.5'

#4@24

4400.00

#4@24

20000.00

#5@24

5000.00

#4@24

15000.00

6'

#4@24

400.00

#4@24

20000.00

#5@24

1400.00

#4@24

3000.00

6.5'

#5@24

4000.00

#4@24

20000.00

#4@12

1100.00

#5@24

14000.00

7'

#5@24

1000.00

#4@24

13500.00

#5@12

5000.00

#5@24

4000.00

7.5'

#4@12

1700.00

#4@24

3500.00

#5@12

2000.00

#4@12

9000.00

8'

#5@12

2500.00

#5@24

9000.00

****

****

#4@12

500.00

8.5'

#5@12

1500.00

#5@24

1000.00

****

****

#5@12

14000.00

9'

****

****

#4@12

5000.00

****

****

#5@12

7500.00

9.5'

****

****

#5@12

18000.00

****

****

#5@12

500.00

10'

****

****

#5@12

13000.00

****

****

#6@12

14000.00

 

Backfill Equivalent Fluid Pressure = 40 psf/ft. of depth1

Concrete= 3,000 psi Rebar = 60,000 psi

CConcrete= 3,000 psi Rebar = 40,000 psi

Height of Backfill

6" Forms

8" Forms

6" Forms

8" Forms

Reinforcing

Axial Load

Reinforcing

Axial Load

Reinforcing

Axial Load

Reinforcing

Axial Load

5'

#4@24

3000.00

#4@24

20000.00

#5@24

3000.00

#4@24

12000.00

5.5'

#5@24

5000.00

#4@24

20000.00

#4@12

3000.00

#5@24

20000.00

6'

#5@24

2800.00

#4@24

17000.00

#5@12

3500.00

#5@24

9000.00

6.5'

#4@12

2600.00

#4@24

7500.00

#5@12

4400.00

#4@12

10000.00

7'

#5@12

4500.00

#5@24

10000.00

****

****

#5@12

12500.00

7.5'

#5@12

1500.00

#5@24

500.00

****

****

#5@12

11000.00

8'

****

****

#4@12

2700.00

****

****

#5@12

5000.00

8.5'

****

****

#5@12

11000.00

****

****

#6@12

16000.00

9'

****

****

#5@12

9000.00

****

****

#6@12

10000.00

9.5'

****

****

#5@12

2700.00

****

****

#6@12

3000.00

10'

****

****

#6@12

14000.00

****

****

#7@12

10000.00

Notes:
User to verify site specific Equivalent Fluid Pressure for backfill material.
Moment Magnifier method used, UBC 1910.11. Meets design requirements of CABO 304.3 and 304.4. Required reinforcing very sensitive to eccentric loading, table based on concentric loading (e=0). Axial Loads are maximum allowable for given reinforcing. Reinforcing CANNOT be reduced for non-bearing application at tabulated backfill height. Reinforcing bar to be placed in the center of the wall. Seismic Zones 3 & 4 use maximum vertical spacing of 12" with equivalent steel, and 2 #4 horizontal in the top beam.

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