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Re: Rectifying faulty beveling in Moment connection

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----- Original Message ----- 
From: "G Vishwanath" <gvshwnth(--nospam--at)yahoo.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, July 14, 2005 10:53 PM
Subject: Rectifying faulty beveling in Moment connection


> List,
> 
> Some W18 beams were to be connected to the column
> flanges using a field butt welded moment connection.
> The beam flanges were beveled.
> A rat hole and  backing strip was provided.
> Full details were shown in the detail dwgs.
> The column webs have stiffeners.
> Our dwgs are OK.
> 
> At the shop in some cases the beveling of the beam
> flanges was not done properly.
> What must have been a Charlie Chaplin/Laurel & Hardy
> team in the shop tried to rectify this.
> You guessed right.
> They made it worse.
> The beams were erected  with a gap of about 1" instead
> of the customary 1/4" between the column flange face
> and the tip of the root of the bevel.
> The web of the beam is cut okay.
> The shear connection is with a single shear plate and
> there was no problem erecting the beams.
> 
> We received a late night (at our end) call and we were
> asked to quickly improvise some rectification sketch
> for the flange butt weld for the engineer's approval.
> We responded immediately and sent out a sketch that
> would have compensated for this gap.
> Our proposal was to externally thicken the column
> flange locally to compensate for the gap.
> 
> We indicated two plates (one for the top flange and
> one for the bottom).
> These were  3/4" thick, 2" in the vertical direction,
> with a horizontal length equal to a little less than
> the column flange to permit all round welding of this
> plate to the column flange.
> These two plates would locally thicken the column
> flanges  at the levels of the beam flanges, to make up
> the gap.
> A continuous column flange plate equal to the full
> depth of the beam would have necessitated removing the
> shear tab which we wanted to avoid.
> 
> Words can't substitute a good sketch.
> I am willing to send a sketch in pdf format to any one
> who is interested and asks.
> 
> We now learn that the field staff were in a tearing
> hurry.
> Time and tide wait for no man.
> Likewise dare-devil erection gangs wait for no
> sketches from detailers or approvals from engineers.
> They simply proceeded to fill the gap with a most
> generous dose of butt weld.
> The inspector has understandably rejected this with
> all the contempt he could muster.
> 
> I am sure the client will send another SOS to  us
> today.
> What can be done now?
> I am thinking of asking them to leave the butt welds
> in place after grinding them smooth,  and provide new
> flange plates and butt weld them to the column flanges
> and fillet weld them to the beam flanges.
> I am also drafting a mercy petition on behalf of our
> fabricator.
> 
> There were seven of these beams but not all were
> messed up.
> Any other ideas?
> Regards
> G Vishwanth
> Bangalore, India
> 
> 
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