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RE: PEMB question - unbraced length

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It depends on the section. The frames generally have additional bracing. The purlins and girts generally do not. With standing seam systems and for wind suction or uplift the compression flanges are not braced. What happens is that the PEMB people (like Butler Manufacturing) test the sections to validate wind loads on elements.

Regards,
Harold Sprague





From: "Yi Yang" <YI(--nospam--at)summit-sr.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: <seaint(--nospam--at)seaint.org>
Subject: PEMB question - unbraced length
Date: Wed, 1 Sep 2004 12:12:49 -0700

For those pre-engineered metal building experts out there, what would be
considered as the unbraced length for both axial and flexural strength
of the column / rafter in a metal building frame, if there is no flange
braces attached to the bottom / inside flange of the rafter / column?
Am I correct to assume that only the top / outside flange is considered
braced for flexural strength, and the weak axis is braced for axial
capacity?  Thanks for any comment.




Y i   Y a n g,   P. E.
STRUCTURAL DIVISION
SUMMIT ENGINEERING INC.
707.527.0775.x15
Santa Rosa, California



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