Try the Navfac publication.
Celso O. Mendoza
From: Richard Lewis <rlewis(--nospam--at)techteam.org>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Thursday, May 13, 1999 2:06 PM
Subject: Concrete Frame Rigidity
>I need a refresher course in lateral load distribution. I need to find the
>center of rigidity of a concrete frame building. I can't find a reference
>that illustrates how to do this. All I find is concrete/masonry wall
>I have a 2 story concrete framed structure in the Dominican Republic. I
>to locate the center of rigidity. Unfortunately the structure and framing
>not symmetrical so I need to calculate rigidity of the concrete frames. It
>is also irregular in plan. I know rigidity is the reciprocal of defection,
>but is there an easy way to calculate this for rigid frames?
>I appreciate all insight into this topic.
>Richard Lewis, P.E.
>Missionary TECH Team
>The service mission like-minded Christian organizations
>may turn to for technical assistance and know-how.