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RE: Bent Beam/Frame
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Bent Beam/Frame
- From: <William.Sherman(--nospam--at)CH2M.com>
- Date: Fri, 7 Sep 2007 11:17:48 -0600
No, you cannot just ignore the horizontal reactions from
the rigid frame. Greater rigidity may reduce the force but it does not
eliminate it. You should analyze the horizontal reactions based on frame
analysis for the stiffnesses provided, and follow the load path and design for
CH2M HILL / DEN
We are providing a steel bent beam/frame in a custom home to support the
ridge beam within the ceiling instead of the typical king post to
ceiling beam. The Steel frame is sized to fit within the depth of
the R.R. and it is a 3/12 pitch, made with 2 square steel sections
and a full penetration weld connection is provided at the apex, where the 2
beams meet. The bearing of the frame is at a 4x post at each end, hidden within
Now my question is, if you determine the reactions using a simple FBD there
will be an x & y reaction at the bearing points at the 4x posts, but if the
steel frame is designed as stiff as possible to limit the deflection to
negligable amounts then I am assuming that there will only be vertical reactions
in the y direction. Therefore a wood post can be used without designing the
connection for a very large reaction in the horizontal direction.
Am I right in this assumption?