Evo Design - structural design Calculation 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  
Input  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)  
                notatie fundatii.jpg
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          
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                  
          notatie fundatii 2.jpg     kip-ft    
  Foundation Base