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Lateral Support for Piles (UBC 97)

Lateral Support for Piles (UBC 97)

Lateral Support for Piles (UBC 97)

(OP)
I am presently working on the foundation design for a piperack.  The project is located in a Zone 1 seismic area (UBC 97).  UBC Sec 1807.2 states that "Individual piles caps and caissons of every structure subjected to seismic forces shall be interconnecetd by ties."  The pipe rack is a standard 2 layer pipe racks 25' wide by 40' tall by 200' long.  The columns are spaced at about 25 feet on center.  The code seems to imply that I will need to run a grade beam (tie) between each and every pile cap of the pipe rack.  Is this the correct way to interpret the code?  Is there a more cost effective way to meet the code requirements?  Analysis alone does not require these ties.

RE: Lateral Support for Piles (UBC 97)

The exception to UBC 1807.2 allows for "other approved methods" if "equivalent restraint can be provided."  If the soils near the surface are stiff/strong enough to provide lateral restraint (based on lateral passive resistance) for the top of the pier, this is often used as an "other approved method".

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