To: "INTERNET:seaint(--nospam--at)seaint.org" <seaint(--nospam--at)seaint.org>
Subject: Re: Seismic - Isolating CMU infill wall
From: Mark Gilligan <MarkKGilligan(--nospam--at)compuserve.com>
Date: Tue, 22 Jun 1999 03:19:30 -0400
In response to your questions.
< 1. If you provide a gap which is a little bit more than the
anticipated deflection of the frame do you think the frame will still lean
The actual seismic deflections will be much larger than calculated using
the forces specified in the code. As a result it may be difficult to
acomplish what you intend.
< 2. Assuming that the frame will lean on the wall but the wall
was not designed to resist the shear or lateral load, what will happen to
The problem is not with the wall but with the damage that the wall will
cause to the frame. In almost every eathquake where there are masonry
infill walls in between concrete frames it is the frame that is damaged.
< 3. If the wall will fail, will the frame be able to resist the
lateral load that has designed for in the first place?>
Even if the wall fails it can induce torsional behavior in your structure
which would significantly increase the demand on some members thus
increasing the likelyhood that they will be damaged. This happens because
the infill walls are stiffer on one side of the building.