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RE: Seismic design of block fences

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Yes.  I would default to the minimum in UBC 32-3.  Block fences have not
been studied to the extent that they need for proper inclusion in the Code.
With "sound walls" along miles and miles of roads currently being
constructed, it is an issue that needs some attention.  This item is part of
my responsibility as Chair of the BSSC TS 13, and I will be adding it to the
items that need proper study for inclusion in the NEHRP Provisions and
ultimately the IBC.

I appreciate your pointing out the issue.

Harold Sprague
The Neenan Company

-----Original Message-----
From: Parkerres(--nospam--at) [mailto:Parkerres(--nospam--at)]
Sent: Thursday, August 19, 1999 5:42 PM
To: seaint(--nospam--at)
Subject: Re: Seismic design of block fences

In a message dated 8/19/99 10:00:42 AM Pacific Daylight Time, 
harold.sprague(--nospam--at) writes:

<< And as you
 pointed out, the 1997 value is in fact less than the 1994 value.
    Fworking = .14W (1997 UBC)
    F = .20W         (1994 UBC)
 Leaving in the 2/3 factor in the 1997 UBC would have been unconservative.

Harold -

Thanks for the input.  For further clarification, should I be using eq 32-3 
where Fwrkg = .29W as a minimum instead of .14W?

Bruce Resnick, SE
Parker Resnick Str. Eng.