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RE: Backing bar in RBS steel moment connection

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At the beam bottom flange, the backing shall be removed.
At the top flange, removing the backing is optional. (continuous attachment to the column with a fillet weld is required)
My opinion is that leaving backing bars in place is a poor idea, however, it is often cost prohibitive to remove them, backgouge and backweld with a reinforcing fillet.

----- Original Message -----
From: "Gautam Manandhar"
To: seaint(--nospam--at)
Subject: RE: Backing bar in RBS steel moment connection
Date: Mon, 7 May 2007 14:55:31 -0700

List members:


In a RBS steel moment connection, the expected plastic hinge is at the reduced beam section.  How important is it to remove the backing bar at the beam-column connection?  I am aware that in the pre-Northridge, fracture initiated at the bottom CJP joint.   Is anyone aware of tests done with the backing bar in place.





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