UFC 4-023-03
25 January 2005
Due to the numerous ways that ductility and shear strength can be enhanced,
no specific guidance is given herein. However, the analysis and design approaches
must be based on methods or data that are approved by the building owner.
Table B-1 Steel Moment Frame Connection Types (from GSA 2003)
Description
Connection
Type
Figure
Strong Axis
Full-penetration welds between beams and
columns, flanges, bolted or welded web,
Welded Unreinforced
FR
B-11(a)
designed prior to code changes following the
Flange (WUF)
Northridge earthquake.
Welded Flange Plates
Flange plate with full-penetration weld at column
FR
B-11(b)
(WFP)
and fillet welded to beam flange
Welded Cover-Plated
Beam flange and cover-plate are welded to
FR
B-11(c)
Flanges
column flange
Bolted Flange Plates
Flange plate with full-penetration weld at column
FR or PR
B-11(d)
(BFP)
and field bolted to beam flange
Full-penetration welds between beam and
Improved WUF-Bolted
FR
B-11(a)
column flanges, bolted web, developed after
Web
Northridge Earthquake
Full-penetration welds between beam and
Improved WUF-Welded
column flanges, welded web developed after
FR
B-11(a)
Web
Northridge Earthquake
Web is coped at ends of beam to separate
flanges, welded web tab resists shear and
FR
B-11(e)
bending moment due to eccentricity due to
Free Flange
coped web developed after Northridge
Earthquake
Welded Top and Bottom
Haunched connection at top and bottom flanges
FR
B-11(f)
Haunches
developed after Northridge Earthquake
Connection in which net area of beam flange is
reduced to force plastic hinging away from
FR
B-11(g)
Reduced Beam Section
column face developed after Northridge
Earthquake
Top and Bottom Clip
Clip angle bolted or riveted to beam flange and
PR
B-12(a)
Angles
column flange
Split tees bolted or riveted to beam flange and
PR
B-12(b)
Double Split Tee
column flange
Composite Top and Clip
Clip angle bolted or riveted to column flange and
PR
B-12(a) similar
Angle Bottom
beam bottom flange with composite slab
Flange plate with full-penetration weld at column
PR
B-11(d)
Bolted Flange Plates
and bolted to beam flange
Stiffened or unstiffened end plate welded to
PR
B-12(c)
Bolted End Plate
beam and bolted to column flange
Shear Connection with
Simple connection with shear tab, may have
PR
B-12(d)
or without Slab
composite slab
Weak Axis
Full-penetration welds between beams and
FR
B-13(a)
Fully Restrained
columns, flanges, bolted or welded web.
Shear Connection
Simple connection with shear tab
PR
B-13(b)
Note:
PR = Partially Restrained Connection
FR = Fully Restrained Connection
B-19
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