To: "INTERNET:seaint(--nospam--at)seaint.org" <seaint(--nospam--at)seaint.org>
Subject: RE: Overturning check
From: Mark Gilligan <MarkKGilligan(--nospam--at)compuserve.com>
Date: Fri, 4 Feb 2000 00:21:17 -0500
I believe your assumption that the allowable soil pressures would insure a
given factor of safety is based on a continious foundation under a wall or
braced frame where there is a triangular stress distribution in the soil.
Alternately you could have a braced frame with a rectangular spread footing
under the column at each end. In this configuration you would assume a
uniform soil stress distribution which could be consistent with a 1.0 FS
It is interesting to note that the 1967 UBC has a J factor which is used to
reduce the overturning moment.
Message text written by INTERNET:seaint(--nospam--at)seaint.org
>Several people mentioned that an overturning ratio of 1.0 would be ok.
has no specifiec number, however, from a practical standpoint, 1.0 can
used because the soil pressure would equal infinity at a ratio of 1.0.
checks for the maximum soil pressure (including the 1/3 increase commenly
for seismic) tend to limit the overturning ratio to the range of around