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ASD Table B5.1
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- Subject: ASD Table B5.1
- From: Andrew Abbo <AndrewA(--nospam--at)formsys.com>
- Date: Fri, 23 Jul 1999 15:37:17 +0800
In table B5.1 of ASD, foot note e defines an expression compression element restraint coefficient, kc. This expression includes the ratio h/t. What is the definition of h and t used in this equation? While I think that h is well defined, the value of t is open to interpretation as either tw (web thickness) or tf (flange thickness). I have been given different interpretations of both h and t by different people, all of which have some merit. They are (1) h is the clear distance between the flanges (height of the web) and t is the thickness of the flange (t=tf). (2) h is the clear distance between the flanges (height of the web) and t is the thickness of the web (t=tw). (3) h is the width of the compression element which, in the context Table 5.1, is the width of the flange and t=tf. I think that (2) is the correct interpretation and this is backed up by the Example 12 and Page 2-220 of the green book (9th Edition). However, it does seem unusal that the local buckling capacity of a flange is related to the stiffness of the web. Can someone please expand this. Andrew -- Andrew Abbo - AndrewA(--nospam--at)formsys.com Formation Design System - http://www.formsys.com Maxsurf for marine design, Multiframe for structural design, Neoform for industrial design
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