Page 161 - Handbook of Structural Steel Connection Design and Details
P. 161
Design of Connections for Axial, Moment, and Shear Forces
146 Chapter Two
Figure 2.52 Column web yield lines and design parameters for unstiffened seated
connection.
research. For unstiffened seats, column web bending also occurs, but no
research has been done to determine its effect. This is the case because
the loads and eccentricities for unstiffened seats are much smaller than
for stiffened seats. Figure 2.52 presents a yield-line analysis that can
be used to assess the strength of the column web. The nominal capac-
ity of the column web is
2mpL T T L
R w 5 a2 1 1 b
e f Bb L 2b
where the terms are defined in Fig. 2.52, and
2
t w F y
m p 5
4
T 2 c
b 5
2
Since this is a yield limit state, 0.9 and 1.67.
Example A W14 22 beam (A992) is to be supported on an unstiffened seat
to a W14 90 column (A992). The given reaction (required strength) is 33
kips. Design the unstiffened seat.
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