Return to index: [Subject] [Thread] [Date] [Author]

Re: Strength of Non-Compact HSS

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Nominal moment strength equations specifically for round and rectangular
HSS sections can be found in Section 5.1 of the AISC HSS Specification
(1997).   The equations given for round and rectangular HSS are different,
based on reduced cross-sections, and do not match LRFD Specification
Appendix F.  The HSS Specification is bound in the HSS Manual (1997).

Rick Drake, SE
Fluor Daniel, Aliso Viejo, CA

********************************





"Jones, Mark A (Battle Creek)" <Mark.A.Jones(--nospam--at)jacobs.com> on 01/16/2001
07:58:57 AM

Please respond to seaint(--nospam--at)seaint.org

To:   "SEAINT mailing list (E-mail)" <seaint(--nospam--at)seaint.org>
cc:

Subject:  Strength of Non-Compact HSS




What is the formula for reducing the strength of non-compact HSS?

LRFD, pg4-8 gives the formula
 phi.b Mn = phi.b Mp - phi.b(Mp-Mr)[(Lb-Lp)/(Lr-Lp)].
But the section says that this is for I or C rolled shapes only.

LRFD, App. F, pg 6-11 gives (substituting l for lambda)
Mn = Cb[Mp - (Mp-Mr)[(l-lp)/(lr-lp)]

Can I use the second formula for any shape?

Mark Jones
Jacobs Engineering









-----------------------------------------------------------------------------------------------------
The information transmitted is intended only for the person
or entity to which it is addressed and may contain confidential
and/or privileged material. If you are not the intended recipient 
of this message you are hereby notified that any use, review,
retransmission, dissemination, distribution, reproduction or any
action taken in reliance upon this message is prohibited. If you 
received this in error, please contact the sender and delete the 
material from any computer.  Any views expressed in this message
are those of the individual sender and may not necessarily reflect 
the views of the company.  
-------------------------------------------------------------------------------------------------------