Need a book? Engineering books recommendations...

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

Re: OSHPD SCBF's using HSS Braces

[Subject Prev][Subject Next][Thread Prev][Thread Next]

I am fairly certain the OSHPD restriction applies to square sections as
well though I do agree that in the AISC text a rectangle categorization
doesn't seem to always include squares, contrary to what I too was
taught in elementary school.  I believe the cited testing which
indicated local stability problems with these sections actually used
square sections in the testing.  (Uriz and Mahin was the testing cited
per the final statement of reasons for amendments to the CBC by OSHPD,

If you are going to specify a round section I recommend you research
some of the additional recent testing and research.  As I understand it
the round HSS braces with high compactness ratios close to but still
within the code limit may be subject to the same local stability issues.

Maybe the future codes will just revise the b/t ratios for HSS sections
of all shapes?  

FYI; the City of Long Beach also has a similar restriction on
rectangular HSS in SCBFs.  If anyone know of other cities or
jurisdictions that have adopted this I would be interested to know.

Donny Harris, SE

From: Gerard Madden, SE [mailto:gmse4603(--nospam--at)]
Sent: Wednesday, October 15, 2008 3:26 PM
To: seaint(--nospam--at)
Subject: OSHPD SCBF's using HSS Braces

Section 2205A. of the CBC modifies AISC 341 for SCBF's using
RECTANG= ULAR HSS sections. The section requires them to be filled solid
with cement=  grout. This is for OSHPD only projects.

Question: Do the really mean Rectangular and Square HSS sections or only
Re= ctangular as stated?


******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to seaint-ad(--nospam--at) Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: 
******* ****** ****** ****** ******* ****** ****** ********