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Flagpole Footing Design Based on
Chapter 18 both IBC & UBC
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INPUT DATA & DESIGN SUMMARY
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IS FOOTING
RESTRAINED @ GRADE LEVEL ?
(1=YES,0=NO)
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P
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LATERAL FORCE @ TOP
OF POLE
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P =
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HEIGHT OF POLE
ABOVE GRADE
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H =
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DIAMETER OF POLE
FOOTING
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B =
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H
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LATERAL SOIL
BEARING CAPACITY
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S =
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ISOLATED POLE
FACTOR (IBC 1804.3.1 or UBC note 3 on Tab 18-I-A)
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F =
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FIRST TRIAL DEPTH
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D =
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D
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Units ? ( English = 1,
Metric = 2 )
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ANALYSIS
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LATERAL BEARING @
BOTTOM :
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LATERAL BEARING @
D/3 :
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, FOR NONCONSTRAINED
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REQUIRD DEPTH :
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, FOR CONSTRAINED
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NONCONSTRAINED
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CONSTRAINED
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LATERAL FORCE @ TOP OF POLE
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P =>
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HEIGHT OF POLE ABOVE GRADE
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H =>
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DIAMETER OF POLE FOOTING
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B =>
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LATERAL SOIL BEARING CAPACITY
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FS =>
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1ST TRIAL
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TRY D1 =>
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LAT SOIL
BEARING @ 1/3 D
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S1 =>
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LAT SOIL
BEARING @ 1.0 D
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S3 =>
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CONSTANT
2.34P/(BS1)
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A =>
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-
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-
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REQD
FOOTING DEPTH
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RQRD D
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2ND TRIAL :
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TRY D2=>
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LAT SOIL
BEARING @ 1/3 D
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S1 =>
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LAT SOIL
BEARING @ 1.0 D
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S3 =>
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CONSTANT
2.34P/(BS1)
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A =>
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-
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-
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REQD
FOOTING DEPTH
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RQRD D
=>
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3RD TRIAL :
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TRY D3=>
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LAT SOIL
BEARING @ 1/3 D
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S1 =>
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LAT SOIL
BEARING @ 1.0 D
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S3 =>
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CONSTANT
2.34P/(BS1)
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A =>
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-
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-
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REQD
FOOTING DEPTH
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RQRD D
=>
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4TH TRIAL :
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TRY D4=>
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LAT SOIL
BEARING @ 1/3 D
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S1 =>
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LAT SOIL
BEARING @ 1.0 D
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S3 =>
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CONSTANT
2.34P/(BS1)
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A =>
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-
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-
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REQD
FOOTING DEPTH
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RQRD D
=>
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5TH TRIAL :
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TRY D5=>
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LAT SOIL
BEARING @ 1/3 D
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S1 =>
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LAT SOIL
BEARING @ 1.0 D
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S3 =>
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CONSTANT
2.34P/(BS1)
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A =>
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-
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-
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REQD
FOOTING DEPTH
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RQRD D
=>
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