Need a book? Engineering books recommendations...
Re: Bent Beam/Frame[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Bent Beam/Frame
- From: "erik gibbs" <erik.gibbs(--nospam--at)gmail.com>
- Date: Fri, 7 Sep 2007 11:14:21 -0700
Thanks. This frame is not being used to resist any lateral forces, only vertical.
Gentlemen,I agree with Josh on this one. The major impact is that all horizontal wind and earthquake loads must be resisted elsewhere since this frame can resist no horizontal loads.Regards,H. Daryl Richardson----- Original Message -----From: Josh ComfortSent: Friday, September 07, 2007 11:36 AMSubject: RE: Bent Beam/Frame
If the tube steel members are connected together with a full pen weld at the apex, you have a "fixed" condition at the peak and your FBD should not show any lateral reactions unless there is an external lateral force. Assuming you are not using the bent beam/frame to support any lateral forces, I don't see any problem with design the supports for the vertical reaction only. Y ou would want to consider the horizontal deflection of the frame though and take that into account when designing the support posts.If you had a "pinned" condition at the apex you would have lateral forces do the the ridge beam reaction that would need to be resolved.
Josh Comfort, P.E.-----Original Message-----
Golden, Graper & Burton, Inc.
1500 W. Fourth Ave., Suite 509
Spokane, WA 99204
(509)624-3224 (509)624-3225 Fax
From: William.Sherman(--nospam--at)CH2M.com [mailto: William.Sherman(--nospam--at)CH2M.com]
Sent: Friday, September 07, 2007 10:18 AM
Subject: RE: Bent Beam/FrameNo, 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 it.Bill ShermanCH2M HILL / DEN720-286-2792
From: erik gibbs [mailto:erik.gibbs(--nospam--at)gmail.com]
Sent: Friday, September 07, 2007 11:04 AM
Subject: Bent Beam/Frame
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 the wall.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?Erik Gibbs
- Prev by Subject: Re: Bent Beam/Frame
- Next by Subject: RE: Bent Beam/Frame
- Previous by thread: Re: Bent Beam/Frame
- Next by thread: RE: Bent Beam/Frame