API 650 Baseplate Design
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Transcript of API 650 Baseplate Design
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8/13/2019 API 650 Baseplate Design
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Baseplate Design Per AISC / API 650
Rev # Rev Description Rev By Rev Date
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Notes
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Baseplate Design per API 650
A. Introduction
API 650 requires that the baseplates be designed per AISC or other approved standard. These baseplates are
designed using the latest edition of AISC with temperature modification factors per API 650, Appendix M.
B. Geometry
Column diameter Corrosion allowance Baseplate thickness
dc 18 in:= CAb 0 in:= tb .25 in:= tbp1 1.75 in:= Dbp 75 in:=
C. Material Properties
Design temperature Yield stength Allowable Soil bearing pressure
Td 350 F:= Fybp 36 ksi:= Qsbc 3000 psf:=
Yield strength reduction factor for baseplate
design per API 650, Appendix MRFys RY1
Td
F
Fybp 45 ksiif
RY3Td
F
Fybp 55 ksi>if
RY2Td
F
otherwise
0.87=:=
RFys 0.87=
Poisson's ratio
0.3:=
D. Loading
Pc 100000 lbs:=Total load at base of column
bp 1.67:=Safety factor for baseplate
design
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Baseplate Design per API 650
Fbb Fybp
RFys
bp
:=
Fbb 18647 psi=Bending strength in baseplate
Lpb PBFbb tb CAb( )
2
3 Qsbc:= Lpb 4.32 in=
Width of participating bottom plate
Qact
Pc
4Dbp( )
2tbp1 Dbp 2 Lpb+( )
2Dbp( )
2 tb+ s+
4Dbp 2 Lpb+( )
2
:=
Mbp
Qact Dbp( )2
64
3
1+
1
4dc
2
2
Dbp( )2
Qact Dbp 2 Lpb+( )2
16
1
2
1
1
1
1+
ln
Dbp
dc
+
21
1
dc
2
2
Dbp( )2
+
...:=
fbbp
4 Mbp
tbp1 CAb( )2
:= fbbp 16581 psi=Actual bending stress in baseplate
Checks that actual bearing pressure does not exceed
allowable soil bearing capacity. A value less than 100%
indicates adequate area
Qact
Qsbc
89.4 %=
Bending stress check.
Values must not exceed 100%
fbbp
Fbb
88.9 %=
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