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RE: prestressed piles

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You might want to contact Prof. Ben Gerwick at U.C. Berkeley.  
Regards,
Bill Cain, SE
Oakland CA


	-----Original Message-----
	From:	Acie Chance [SMTP:achance(--nospam--at)lacsd.org]
	Sent:	Monday, July 17, 2000 10:06 AM
	To:	'seaint(--nospam--at)seaint.org'
	Subject:	prestressed piles




	     I could use the help of anyone who has experience designing
prestressed 
	concrete piles. I need to design a 100 foot long pile to take 240
kips of 
	vertical load and 45 kips of horizontal load. The top 25 feet will
be a 
	composite pile,  30" diameter drilled pier with conventional
reinforcing and 
	the prestressed pile extending up through the composite length to
the pile cap. 
	The idea is to predrill the 30" section then drill a smaller hole
for the 
	remaining 75 feet. The prestressed pile will then be driven and a
rebar cage 
	lower around it for the first 25 feet. The soils engineer has given
the 240 kip 
	load for a 14" diameter pile. The top 25 feet will take the 45 kip
horizontal 
	load.
	     I have been reading about prestressed piles but the information
I have is 
	not  specific and none have any thing about a composite pile. As
this project 
	is to go for a review of the 100% package in three weeks time is
important to 
	me. Any help on references which include design examples of
prestressed piles 
	would be appreciative. Additionally any pitfalls on using pile
splices would 
	also be appreciated.

	Thanks in advance
	Acie Chance

	P.S.  Phone (562) 908-7411 ext. 2010
	        Fax.    (562) 908-4270
	        e-mail  achance @lacsd.org


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