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Hi everyone,
I have a project in Palo Alto where I have a pile(pier) and Grade beam
foundation.
The pile(pier)  is 16" Dim. and 12'-00" deep  with 4-# 5 vertical
reinforcement and originally  I had spaced my transverse reinformence
with # 3 bars @ 16" o.c.  The plan chker. wants me to use section
1809.5.2.2 of the U.B.C. to redesign my teansverse reinforcement.
Section 1809.5.2.2 then send me to section 1921.4.4.1 since my ties are
rectangular. Using formula 21-4 and setting the fallowing values:
#3 ties Area-2x.11=.22
hc-7"
f'c-2500 psi
fyh-40,000psi
I get 5.6 " o.c. which I think is too close.  Can I used 1.33 factor to
increase my spacing?
It this calc. correct or I am missing something?
Where I can find reference about pile (pier) design ?
Any Historycal/technical respond about this subject will be greatly
apreciated.
Thanks
 F. Duarte, EIT
--
Francisco Duarte
Lea and Sung Engineering, Inc.
Tel: 1-510-887-4086
Fax: 1-510-887-3019