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RE: Semi rigid connection design

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Harold Sprague,

Thank you for reply. 

If possible, kindly elaborate the procedure used for the design of 
connection where beam-column would go undergo an elastic deformation 
and plate would undergo an inelastic deformations.

Bhavin Shah, M.E. Structures
Design Engineer
VMS EDS, India.
bhavin(--nospam--at)vmsconsultants.com


> When I perceive semi-rigid connections, I perceive a connection that 
will 
> undergo inelastic deformations.  If that inelastic deformation occurs 
in the 
> beam section, I guess that would be acceptable.  Inelastic 
deformation in 
> the column is not acceptable.
> 
> The semi-rigid connections that I have used in the past had the 
inelastic 
> deformations occur in a welded plate.  The beam and column were 
designed to 
> remain elastic when the plate was undergoing inelastic deformations.
> 
> Regards,
> Harold Sprague
> 
> 
> >From: "Secretary, IASE  Guj " <secy(--nospam--at)iaseguj.org>
> >Reply-To: <seaint(--nospam--at)seaint.org>
> >To: <seaint(--nospam--at)seaint.org>
> >CC: bhavin(--nospam--at)vmsconsultants.com
> >Subject: RE: Semi rigid connection design
> >Date: Sat, 30 Oct 2004 13:26:37 +0530
> >
> >Harold Sprague,
> >
> >You are right that use of knee bracing will induce bending in the
> >columns.
> >
> >However, in my opinion, effective length of column will be reduced as
> >compared to that as in the absence of knee bracing. Use of knee 
bracing
> >will reduce the effective span of the beam as well as column and also
> >moment connection will be avoided at beam-column juction, which may 
be
> >unpractical to design for large values of bending moments. Hence, use
> >of knee bracing may be economical and feasible solution.
> >
> >Please give your views/ suggestions etc.
> >
> >Regards,
> >
> >Bhavin Shah, M.E. Structures
> >Design Engineer
> >VMS EDS, India.
> >bhavin(--nospam--at)vmsconsultants.com
> >
> > >
> > > -----Original Message-----
> > > From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
> > > Sent: Friday, October 29, 2004 10:25 AM
> > > To: seaint(--nospam--at)seaint.org
> > > Subject: RE: Semi rigid connection design
> > >
> > >
> > > >In steel structures, are you considering Semi rigid Connections ?
> > > Yes
> > > >If, yes than kindly share your experience regarding following
> >points -
> > > >
> > > >1) Use of knee bracing at each and every beam column junction, so
> >that
> > > >moment at the junction can be taken care off by the knee bracing 
and
> >the
> > > >junction may be designed as a shear connection only.
> > > No.  It can put bending in the columns, and it is difficult to 
have a
> > > predictable yield point of the connection.
> > > >
> > > >2) Experiment data available .
> > > None of which I am aware.
> > > >3) Other points, if any.
> > > Design for the yield of the connection.  Look at 
Blodgett's, "Design
> >of
> > > Welded Connections".
> > >
> > > Regards,
> > > Harold Sprague
> > > Bhavin,
> > >
> > > You can find seismic design and testing of knee bracing in one of 
my
> > > publications. I designed and tested them as a viable retrofit for 
a
> >type of
> > > existing riveted connections which would qualify as semi-rigid
> >connections
> > > while exhibiting unsymmetrical and highly pinched hysteretic 
response.
> > >
> > > "Cyclic Testing of Existing and Retrofitted Riveted Stiffened Seat
> >Angle
> > > Connections"
> > > ASCE Journal of Structural Engineering, Vol. 122, No.7, July 
1996, pp.
> > > 762-775
> > >
> > > Regards,
> > >
> > > Dr. Majid Sarraf, P.E., P.Eng.
> > > Bridge Project Engineer/Senior Seismic Specialist
> > > Sacramento, CA
> > >
> > >
> > >
> > > >From: Bhavin Shah <vmscons(--nospam--at)eth.net>
> > > >Reply-To: <seaint(--nospam--at)seaint.org>
> > > >To: seaint(--nospam--at)seaint.org
> > > >Subject: Semi rigid connection design
> > > >Date: Mon, 25 Oct 2004 18:35:16 +0530
> > > >
> > > >Dear all,
> > > >
> > > >Sub : Semi rigid connection design
> > > >
> > > >In steel structures, are you considering Semi rigid Connections ?
> > > >
> > > >If, yes than kindly share your experience regarding following
> >points -
> > > >
> > > >1) Use of knee bracing at each and every beam column junction, so
> >that
> > > >moment at the junction can be taken care off by the knee bracing 
and
> >the
> > > >junction may be designed as a shear connection only.
> > > >
> > > >2) Experiment data available .
> > > >
> > > >3) Other points, if any.
> > > >
> > > >
> > > >Regards,
> > > >
> > > >Bhavin Shah, M.E. Structures
> > > >Design Engineer
> > > >VMS EDS, India.
> > > >bhavin(--nospam--at)vmsconsultants.com
> > >
> 
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