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Calculate Diameter or Width of Pier to Support Vertical Load:
           
Calculation:
Designer/Checker:
   
Input:  
   
 
(Note: All input Metric units are converted to English units for the equations below and then the output English units are converted back to Metric)
 
 
Vertical load on pier (P - tons or kN)
Allowable pressure or soil bearing capacity (pa - tsf or kPa)
Ratio of depth of pier to diameter or width (DW)
Ratio of length to width (LW - enter 1.0 for round pier)
Allowable soil friction resistance (FR - tsf or kPa, 0 for sand)
(IBC: FR = pa/6, 0.25 tsf max)  

     
   
   
Output:
 
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Required diameter or width (w) of pier =
   
 
 
 
 



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