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Base Plate Design

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I’m currently in the process of providing calculations for a base plate based on the methods provided in the Design Guide 1 that many of you graciously helped me obtain.  However, I’ve ran into a bit of a snag –

Following the example on page 22 for an HSS12x12x3/8 with an18x18x1” base plate loaded with 25.2kips and 428.4 k-in, the bolts have a 2” edge distance in each direction.


I’ve determined the smaller value of A to be 2.1 inches, but the calculation for the critical section - (18-0.95*12)/2=3.3 – is beyond this distance – thus there is no compressive stress at this section.  Further, I’m not following what the 1.3 is supposed to represent in the solution of Mpl at the top-right of that page. 


Any help would be much appreciated. 


Richard Calvert, EIT 

Project Engineer


Lindemann Bentzon Bojack

Architects & Engineers

290 Citrus Tower Blvd, Suite 200, Clermont, Fl. 34711

tel: 352.242.0100 ext.141 fax: 352.242.0302

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