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[SEAOC] RE: [SEAOC] wood pile foundations

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The method for determining existing pile condition in timber pilings for
bridges is to drill through the pile and determine the amount of rot
that has occurred inside the pile.  Typically, the existing pile
condition is worse than the exterior condition would suggest, as the
pile deteriorates from the inside out. As the drill penetrates through
the pile the resistance is measured and the amount of rot, or loss of
section, can be estimated. 

Once the pile condition is determined it becomes a simple calc. to
determine the load capacity of the pile using the "unrotted" timber
section as load carrying.

Brian Bellfi 
"One of those bridge guys, again"
>From: 	HARRISENGR(--nospam--at)[SMTP:HARRISENGR(--nospam--at)]
>Sent: 	Thursday, September 05, 1996 10:17 PM
>To: 	seaoc(--nospam--at)
>Subject: 	[SEAOC] wood pile foundations
>     A homeowner asked how he could add a second story to his Malibu beach
>home on wood piles between the road and ocean. The house is 40 years old. He
>mentioned a similar project up the street had 200 kip load testing on 4 piles
>( with sand ) recommended by the engineer ( 50 kips per pile ). This project
>never happened. When i considered the volume of sand required to develope
>this load it seemed unworkable, inside an existing house. Powerlines and
>restricted beach access make adding new piles difficult.
>     I would appreciate any information on justification of adding additional
>loads to old wood piles and checking for deterioration.
>    Thanks in advance.
>Tom Harris , SE
>Thousand Oaks, CA