NorthWoods Software
Program Name:
Retaining_Wall
Project Name:
-
Project Number:
-
Project Description:
-
Project Designer:
Dik
Last Revised (yy-mm-dd):
19-08-31
Reference:
NBCC
Created using SMath Studio, a MathCAD workalike from https://en.smath.info/view/SMathStudio
The User is responsible to verify data using an alternative method
Menu:
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Input Data
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Important Output
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Logical Constructs
Blue
Units
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Sum / For
Red
Important Note
Defined Units:
Force
Moment
Density
Force per Unit Length
Pressure
User Defined Functions
Examples
Input Data
Material Property Factors
phi soil is taken as 1.0 since ULS = SLS bearing is used
Load Factors
Dead Load
Dead Load
Dead Load
Soil Load - Minimum Load Factor due to lack of redistribution
Soil Load
Soil Load
Material Properties
Concrete Density
Soil Properties
Density
ULS Bearing
Cohesion
Angle of Friction
Coefficient of Friction
External Forces (Applied to Inside Face of Wall)
Offset Distance from Toe
Wall Dimensions (Refer to Diagram)
Wall Thickness at Top
Wall Thickness at Bottom
Total Height of Wall
Depth of Soil Below Top of Wall
Depth of Soil at Toe
Depth of Key
Width of Footing
Width of Key
Thickness of Footing
Soil Side Overhang
Tributary Width of Wall
Free Side Overhang
Calculations
Coulomb Active Earth Pressure for Non-Cohesive Soils
Coulomb Passive Earth Pressure for Non-Cohesive Soils
Active Earth Pressure at base of Wall
Total Earth Pressure on Wall per Tributary Width
Overturning Moment from Soil
Resisting Moments from Dead Load of Retaining Wall and Soil
Footing
Key
Wall
Soil on OH1
Soil on OH2
External Force (Dead Load)
Total Dead Load
Dead Load Moment
Dead Load Eccentricity from Toe of Footing
Check Dead Load Moment (Summation with e Values Should be Zero)
Calculated e is Correct. Sum Should Equal 0.
Re-establish Dead Load Moment at Footing
Resistance Against Sliding
Due to Friction
Due to Passive Earth Pressure
Total Force Resisting Sliding (Dead Load)
Load Cases
1) Minimum Wall Design Moment (Use LF = Alpha_H)
2) 1.25 x Dead Load + 1.5 x Soil Load
Overturning
Sliding
3) 0.9 x Dead Load + 1.5 x Soil Load
Overturning
Sliding
4) 1,25 x Dead Load + 0.5 x Soil Load
Overturning
Sliding
5) 0.9 x Dead Load + 0.5 x Soil Load
Overturning
Sliding
6) 1.0 x Dead Load + 0.5 x Soil Load
Overturning
Sliding
Maximum Factored Wall Design Moment
Maximum Factored Design Moment
Maximum Factored Design Shear
Minimum Overturning Factor
Maximum Overturning Factor
Reserve Force Against Sliding
Footing Bearing on Soil
Section Modulus
Dead Load Bearing and Eccentricity (+ve is Compression)
Soil Bearing Pressures Under Factored Loads
1) 1.4 x Dead Load
(Trivial)
2) 1.25 x Dead Load + 1.5 x Soil Load
3) 0.9 x Dead Load + 1.5 x Soil Load
4) 1,25 x Dead Load + 0.5 x Soil Load
5) 0.9 x Dead Load + 0.5 x Soil Load
6) 1.0 x Dead Load + 0.5 x Soil Load
Maximum and Minimum Bearing Pressures
At the Toe
At the Heel
Summary
Concrete Properties
Concrete Density
Soil Properties
Soil Density
Cohesion
Angle of Friction
Coefficient of Friction
Coulomb Active Coefficient
Coulomb Passive Coefficient
External Forces
Wall Dimensions
Wall Thickness at Top
Wall Thickness at Bottom
Total Height of Wall
Depth of Soil Below Top of Wall
Depth of Soil at Toe
Width of Footing
Thickness of Footing
Soil Side Overhang
Free Side Overhang
Tributary Width of Wall
Design Load Cases
1) 1.4 x Dead Load (Trivial and Not Used except for Wall Moment)
2) 1.25 x Dead Load + 1.5 x Soil Load
3) 0.9 x Dead Load + 1.5 x Soil Load
4) 1,25 x Dead Load + 0.5 x Soil Load
5) 0.9 x Dead Load + 0.5 x Soil Load
6) 1.0 x Dead Load + 0.5 x Soil Load
Design Data
Service Soil Pressure at Base
Service Moment from Soil
Total Dead Load
Dead Load Eccentricity from Toe
Maximum Factored Design Moment
Maximum Factored Wall Design Moment
(Using Minimum Specified Load Factor)
Maximum Factored Design Shear
Minimum Overturning Factor
Maximum Overturning Factor
Reserve Force Against Sliding
Maximum and Minimum Bearing Pressures (-ve is Tension)
Maximum Pressure at the Heel
Minimum Pressure at the Toe
Maximum Pressure at the Toe
Minimum Pressure at the Heel