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RE: pier design

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You have had many good responses, but also check out Dowrick, "Earthquake Resistant Structures".  It has a section on bending in the piles.

Harold Sprague
Krawinkler, Luth & Assoc.
4412 W. Eisenhower Blvd.
Loveland, CO 80537
Voice: 970 667-2426
Fax: 970 667-2493
Email: hsprague(--nospam--at)

-----Original Message-----
From:	MarthaAlic [SMTP:MarthaAlic(--nospam--at)]
Sent:	Thursday, March 05, 1998 7:32 PM
To:	seaoc(--nospam--at)
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