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RE: Cold formed joist design

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No problem, Joe.
Let me know.  If you have some specific sections that
you want info from the AISI manual, I can copy and fax
or e-mail to you.
Have a good one.
David

--- Joe Grill <jgrill(--nospam--at)swiaz.com> wrote:

> David,
> Thank you, that is exactly what I was looking for. 
> I don't think you have
> to fax or email anything at this point.  I'll adjust
> my calcs for the "R"
> factor.  Right now the architect is way off on his
> guess as he is trying to
> just double some joist sections and use them for
> beams.  They are not even
> close.  I don't' think that the minor differences in
> section properties
> between AISI and SSMA will make a considerable
> difference at this point, but
> if I need anything further I will let you know.
> 
> Thanks again,
> Joe
> 
> Joseph R. Grill, P.E. (Structural)
> Shephard - Wesnitzer, Inc.
> Civil Engineering and Surveying
> 1146 W. Hwy 89A Suite B
> Sedona, AZ  86340
> PHONE (928) 282-1061
> FAX (928) 282-2058
> jgrill(--nospam--at)swiaz.com
>  
> 
> 
> -----Original Message-----
> From: David Topete [mailto:davetopete(--nospam--at)yahoo.com] 
> Sent: Monday, August 15, 2005 4:20 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Cold formed joist design
> 
> Joe,
> From my '96 ed. of AISI manual, the "R" factor is a
> reduction factor used in the equation for nominal
> bending strength, M_n = R * Se * Fy.  
> R = 0.40 for simple span C sections;
> R = 0.50 for s.s. Z section;
> R = 0.60 for conti. C sections; and
> R = 0.70 for conti. Z sections
> 
> The name designation (unless it's changed from the
> '96
> manual) is prety basic where it is 1. depth, 2.
> section profile, 3. stiffened or unstiffened flanges
> (S or U), 4. flange width, 5. thickness in mils.
> 
> Ex.:  16CS3.75x135 = 16" C-section, stiffened, with
> 3.75" flange width x 0.135" thickness.
> 
> HTH.  Let me know if you'd like for me to fax or
> e-mail to you.
> 
> David Topete, SE
> SF, CA
> 
> 
> --- Joe Grill <jgrill(--nospam--at)swiaz.com> wrote:
> 
> > I have a project where there are a few "C" joists
> > being used over some
> > canopies.  There are a couple of locations where
> the
> > loading is non-uniform.
> > I don't have an AISI manual handy and I am trying
> to
> > check these members
> > using RISA 3D.  There is a design parameter in
> RISA
> > 3D which is labled "R"
> > which has something to do with (I believe as I
> read
> > the help section) with
> > whether the top, bottom or both flanges are
> > restrained laterally.  RISA says
> > the factor can range from .4 to .7 and I think it
> > also said that there is a
> > table in the AISI manual regarding this factor. 
> Can
> > anyone fax me this
> > table or section from the AISI manual?  Also, the
> > section properties and
> > member designations are different between AISI and
> > SSMA.  If I could get
> > someone to fax the explanation for the AISI
> > designations, and possibly a
> > list of member section properties so I can cross
> > check with the SSMA values,
> > I would also be very happy.
> > 
> > Thanks,
> > 
> > Joe Grill
> > 
> >  
> > 
> > Joseph R. Grill, P.E. (Structural)
> > 
> > Shephard - Wesnitzer, Inc.
> > 
> > Civil Engineering and Surveying
> > 
> > 1146 W. Hwy 89A Suite B
> > 
> > Sedona, AZ  86340
> > 
> > PHONE (928) 282-1061
> > 
> > FAX (928) 282-2058
> > 
> > jgrill(--nospam--at)swiaz.com
> > 
> >  
> > 
> >  <http://inet/index.htm> 
> > 
> >  
> > 
> > 
> 
> 
> 
> 		
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