Evo Design - structural design									Calculation No.
									001-FOUNDATION
INTERACTIVE ONLINE CALCULATION SHEET									Project No.
						onlinestructuraldesign.com			SAMPLE CALCULATION
Project Title:	Foundation calculation - interactive design spreadsheet								Calc. By	Date	Rev.
									MN	16.04.2014	0
Subject/Feature:	Foundation design; Foundation maximum soil pressure calculation								Checked By	Date
	Imperial Units spreadsheet								CN	16.04.2014
InputÂ			Output
Working loads			Eccentricity
Footing dimensions			Max. pressure on soil under foundation
Pier dimensions
Materials (soil, concrete)
Maximum Factored Loads
N =		kip	axial force					Pair of maximum loads. Mx and My are not
M =		kip-ft	bending moment					considered simultaneous.
F =		kip	horizontal force on top of foundation (shear)
Footing Dimensions
L =		ft	Foundation base length
W =		ft	Foundation base width
t =	1.5	ft	Foundation base thickness
	(parameters that can not be modified in the demo version)
f =		ft	Depth to top of foundation base
Pier Dimensions
l =		ft	pier dimension along X
w =		ft	pier dimension along Z
h =		ft	pier height
Materials
gfill =		pcf (unit weight of fill material)
gconcrete =		pcf (unit weight of concrete)
General Calculations
Af =	L * W	=		ft2	Foundation Area
Ap =	l * w	=		ft2	Pier Area
Wtc =	(Af*t + Ap*h)*gconcrete =			kips	Concrete Weight
Wts =	(Af - Ap)*gconcrete*f =			kips	Fill Material Weight
Loads transfered to the ground (for the calculation of soil max. pressure)
Nbase =	Wtc + Wts + N	 =		kips
Mbase =	F * (t + h) + M =			kip-ft
e =	Mbase / Nbase	 =		ft   eccentricity
L/6 =		ft
L/2 =		ft
e
									kip-ft
									kip
				Foundation Base
References: