Page 131 - Handbook of Structural Steel Connection Design and Details

Design of Connections for Axial, Moment, and Shear Forces

116 Chapter Two

Figure 2.31 Bolted column splice for biaxial bending.

Example: Design a bolted splice for a W14 99 upper shaft to a W14 193 lower
shaft. Design the splice for 15% of the axial capacity of the smaller member plus
20% of the smaller member’s bending capacity about either the major or the
minor axis, whichever produces the greater flange force F . The columns are
f
ASTM A992, the splice plates are ASTM A36, and the bolts are ASTM A490 1-in-
1
diameter X type. The holes are standard 1-1/16-in diameter. The gage is 7- / in.
2
The completed splice is shown in Fig. 2.31. The flange force due to ten-
sion is
Fy 0.15 3 0.9 3 50 3 29.1
5 0.15 3 A g 5 5 98.2 kips
F f t
2 2
The flange force due to major axis bending is
0.20 3 647 3 12
0.20 M px
F 5 5 5 110 kips
d 14.16
f x
The flange force due to minor axis bending is calculated as follows:
0.20 M py 0.20 3 0.9 3 50 3 836
M 5 5 5 376 kips
f
2 2
Check that M 376 # 3/8 3 0.9 3 50 3 83.6 5 1410 kips-in, ok .
f
Calculate
1 376
e 5 3 14.565c1 2 1 2 d 5 0.523 in
4 B 1410

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