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Lateral bracing of longspan steel joists[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Lateral bracing of longspan steel joists
- From: "DOLORES (DOLLY) TRIVIZ" <dktriviz(--nospam--at)dancris.com>
- Date: Tue, 15 Dec 1998 12:32:41 -0700 (MST)
Dear Sirs: I am working on a project in which I have designed lonspan steel joists (70' span), two configurations--scissors joists 48" deep, and a pitched top chord joist with a maximum top to bottom chord depth of about 12' at midspan. I have specified full depth bridging (diagonal bridging running from top chord on one joist to bottom chord of adjacent joist) throughout. The pitched top chord joist occurs in the middle of the building and supports a moveable folding door on the bottom chord, and the scissors joists occur on each side of this joist at about a maximum 13'-6" spacing. The architect has tried to convince me that we can effectively bridge these joists with 30" deep bridging throughout, with the bridging being connected to a "stiff" (how stiff??) member that will connect the top to the bottom chords of the joist where the bridging member intersects the joist. I have not given my approval because I am not convinced that this constitutes an effective bridging system that will prevent lateral movement of the top and bottom chords of the joists. The roof diafram will consist of plywood. What are anyone' thoughts to this type of bridging system suggested by the architect?
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