Page 369 - Structural Steel Designers Handbook AISC, AASHTO, AISI, ASTM, and ASCE-07 Design Standards

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LATERAL-FORCE DESIGN

LATERAL-FORCE DESIGN 8.23

FIGURE 8.12 Typical connections used for moment-resisting frames. (a) Pre-Northridge welded-flange, bolted-web connection.
(b) Reduced-beam-section connection. (c) Welded-flange, welded-web connection. (d) Bolted flange plate connection.

reinforced with a fillet weld. Top flange welds are reinforced at the backing bar. The research showed
that greater connection ductility is achieved when the connection yields in flexural yielding of the
beam and panel-zone yielding. Connections with inadequate shear resistance were shown to provide
reduced connection ductility, and current design procedures place greater emphasis on the shear con-
nection between the beam web and the column. The work showed that deeper, heavier steel sections

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