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RE: pier design

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Try using section 1806.8.2 of the 1997 UBC "Designs Employing Lateral 
Bearing" which addresses the design of piers subjected to lateral loads. 
 The pier is loaded with a shear "P" at the top and a moment to "P x h". 
 In your case, back calculate "h" based on your actual moment.

-----Original Message-----
From:	MarthaAlic [SMTP:MarthaAlic(--nospam--at)aol.com]
Sent:	Thursday, March 05, 1998 7:32 PM
To:	seaoc(--nospam--at)seaoc.org
Subject:	pier design

I am currently designing a roof platform. The lateral resisting system is
composed of moment frames running in both directions. This platform is 
exposed
and due to space limitations, I have no other choice than using drilled 
piers
for foundations.  For the embendement length, I divided the moment by the
shear at the base and found an equivalent height for the shear load (ie.
M/V=h'). My questions are:

1. What is the minimum reinf. required.
2. Do I have to design the pier as if it were a column with and axial and a
moment (eventhough it is lateraly braced by the soil) or should I just
consider the moment.
3. Is there a source I can use as a guideline for my design.

I will greatly appreciate any information regarding this matter. Thank you



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