Thursday, January 26, 2012

lateral-torsional buckling on storefronts

Regulations have changed so there is a need to design for the lateral-torsional buckling on storefronts now.   

Section 8.4.B.3.a of the ‘Aluminum Windos and Doors, and Glazing’ specifications states the following:



The AAMA standard dealing with storefront design is ‘AAMA SFM-1-87:  Aluminum Storefront and Entrance Manual’.

Engineering Section 6.0 (shown below) directs us to the current Aluminum Association’s Aluminum Design Manual (2010):
The Aluminum Design Manual, section F.2 (shown below), indicates that when framing members are subject to lateral buckling, the nominal flexural strength must consider the un-braced length of the framing in question:

We want you to have this information to give you a better understanding of why we are designing open shaped verticals mullions to prevent lateral-torsional buckling.   This increases the stablity and life of the storefront wall installation providing a higher level of client statisfaction to the end user.


2 comments:

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