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RE: ASD Table B5.1
[Subject Prev][Subject Next][Thread Prev][Thread Next]- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: ASD Table B5.1
- From: Charlie Carter <carter(--nospam--at)aiscmail.com>
- Date: Fri, 23 Jul 1999 08:58:38 -0500
The variable h is the clear depth of the web. Strictly speaking, this is the distance from toe of fillet at one flange to toe of fillet at the other flange. But h can be conservatively taken as the depth between flanges if you don't want to mess with the fillet radius. The variable t is the web thickness. The web does affect the buckling strength of the flange for an I-shaped member. If the flange is to buckle, it does so in a rotational mode (when one flange tip goes up, the other has to go down). The web is along for the ride and will provide some resistance, depending upon its relative stiffness. Charlie -----Original Message----- From: Andrew Abbo [SMTP:AndrewA(--nospam--at)formsys.com] Sent: Friday, July 23, 1999 2:37 AM To: seaint(--nospam--at)seaint.org Subject: ASD Table B5.1 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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