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PROJECT :
PAGE :
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CLIENT :
DESIGN BY :
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JOB NO. :
DATE :
REVIEW BY :
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Lateral Earth Pressure of Rigid Wall Based on AASHTO 17th & 2015 IBC
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INPUT DATA & DESIGN SUMMARY
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SOIL SPECIFIC WEIGHT
gb=110pcf
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SOIL INTERNAL FRICTION ANGLE
f=30
deg
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SLOPE OF BACKFILL
b=15
deg
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EXTERNAL FRICTION ANGLE
d=17
deg
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RACK ANGLE OF WALL FACE
q=90
deg
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The Active Earth Pressure:
Pa=41
psf / ft
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Pa, h=39
pcf (horizontal equivalent fluid pressure)
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The At-rest Earth Pressure:
P0=55
psf / ft
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The Passive Earth Pressure:
Pp=330
psf / ft
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ANALYSIS
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DETERMINE ACTIVE EARTH PRESSURE
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Pa = gb Ka =
41
psf / ft
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Pa, h = Pa sin( q - d) =
39
pcf (horizontal equivalent fluid pressure)
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where0,372
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(Coulomb, AASHTO Figure 5.5.2A)
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The total active resultant, (0.5 H Pa), acts H/3 above the base.
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DETERMINE AT-REST EARTH PRESSURE
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P0 = gb K0 =
55
psf / ft
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where
K0 = 1 - sin f =
0,500
, (AASHTO 5.5.2-2)
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The total horizontal resultant at rest, (0.5 H P0), acts H/3 above the base.
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DETERMINE PASSIVE EARTH PRESSURE
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Pp = gb Kp =
330
psf / ft
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where3,000
, (Rankine, AASHTO Figure 5.5.2D)
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 d =0deg
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 q =90deg
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The total horizontal resultant at rest, (0.5 H Pp), acts H/3 above the base.
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LICENSE NUMBER: Package License Including New Software Based on ASCE 41-17, ASCE 7-16, AISC 360/341/358-16
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www.Engineering-International.com
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