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Re: Pile Cap Design Guidance

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Pile caps with 2 and 3 piles should be designed as a Tied Arch where the column load is transferred through the cap in with equiv. compression diagonal struts and the bottom rebar is the tension chord of the strut (very important to hook the bottom bars at each end so that the bar is fully developed when you need it)  CRSI used to have this design procedure in their handbook however I think there have been several papers written on this design approach for deep beam concrete members.

Lanny J. Flynn, P.E., S.E.
Regional Engineer
AISC Marketing, Inc.
email: flynn(--nospam--at)
-----Original Message-----
From: Bobby Jenkins <jei(--nospam--at)>
To: Seaint <seaint(--nospam--at)>
Date: March 10, 2000 5:13 AM
Subject: Pile Cap Design Guidance

I am desperately seeking information on the manual design of 2 and 3 pile Pile Caps.  All of my examples in text books and CRSI material work with more piles per cap than I am considering. 
I can not simply "handbook" the caps as I am using 30" diameter augered piles and 36" diameter augered piles with 2.5 diameter spacing.  I'm outside the CRSI parameters for both their program and handbook.
ANY suggestions, guidance, or direction would be greatly appreciated.

Bobby Jenkins, P.E.
Jenkins Engineering, Inc.
PO Box 2101 / 218 S Thomas St  Suite 209
Tupelo, MS  38803
(662)840.1233 V / (662)840.1103 F
E-mail:  jei(--nospam--at)