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# Model 3 (Imperial)

## Retaining Wall Calculation Verification – Reinforced concrete cantilever  – Imperial

The data used in this verification example and the results to compare with SkyCiv Retaining Wall Design Software were taken from: The Reinforced Concrete Design Handbook, ACI SP-17(14), Vol. 2, p. 24. This model is particularly interesting because it is a cantilever concrete Retaining Wall with no surcharge applied on the active soil zone.

### Input data

Stem

• Height: 16 ft 9 in (16.75 ft)
• Width: 1 ft 3 in (1.25 ft)
• Offset: 2 ft 6 in (2.5 ft)

Base

• Width: 9 ft 3 in (9.25 ft)
• Thickness: 1 ft 3 in (1.25 ft)

Active and Passive Soil

• Unit weight: 110 pcf (0.11 kcf)
• Friction Angle: 35 degrees

Substructure Soil

• Unit weight: 110 pcf (0.11 kcf)
• Friction Angle: 35 degrees
• Soil-Concrete Friction Coefficient: 0.5
• Allowable bearing pressure: 3000 psf (3 ksf)

Soil Layers:

• Active: 18 ft (18.0 ft)
• Passive: 3 ft
• Substructure: 3 ft

Surcharge Load Value: 0  psf (0.00 ksf)

### Results

After creating the model in the SkyCiv Retaining Wall Software it was solved. The following table shows the results obtained using the software and the ones reported in The Reinforced Concrete Design Handbook:

Units ACI Manual SkyCiv Difference
Overturning
Sum of vertical loads kip 15.008 15.012 0.03%
Restoring moment kip * ft 83.704 83.718 0.02%
Sum of horizontal loads kip 4.829 4.829 0.00%
Overturning moment kip * ft 28.974 28.974 0.00%
FoS 2.890 2.889 -0.03%
Sliding
FoS 1.550 1.554 0.26%
Bearing
Distance of the resultant ft 3.650 3.647 -0.08%
Eccentricity ft 0.980 0.978 -0.20%
Maximum Pressure ksf 2.653 2.653 0.00%
Minimum Pressure ksf 0.591 0.593 0.34%
FoS 1.131 1.131 0.02%