Page 136 - Handbook of Structural Steel Connection Design and Details

Design of Connections for Axial, Moment, and Shear Forces

Design of Connections for Axial, Moment, and Shear Forces 121

a. Outer plate:
1
(1) Gross and net area: Since the bolt gage is 7 / in, try a plate
2
1
10 / in wide. The gross area in tension required is
2
311>2
A 5 5 4.8 in 2
gt
0.9 3 36
and the thickness required is 4.8/10.5 0.46 in. Try a plate
1 / 10 /
1
2 2
A 0.5 10.5 5.25 in 2
gt
A (10.5 2 1) 0.5 4.25 in 2
nt
0.85 A 0.85 5.25 4.46 in 2
gt
2
Since 0.85 A A , use A 4.25 in as the effective net ten-
gt nt nt
sion area.
R 0.75 58 4.25 185 kips > 311/2 156 kips, ok
nt
1
1
Use a plate / 10 / for the outer flange splice plate for the fol-
2 2
lowing limit state checks:
(2) Block shear fracture:
A 7.5 0.5 2 7.5 in 2
gv
A 1.5 0.5 2 1.5 in 2
gt
A (7.5 2.5 1)0.5 2 5.0 in 2
nv
A (1.5 .5 1)0.5 2 1.0 in 2
nt
F A 58 1.0 58.0 kips
u nt
0.6F A 0.6 36 7.5 162 kips
y gy
0.6F A 0.6 58 5.0 174 kips
u nv
R 0.75[58 min{162, 174}] 165 kips > 156 kips, ok
bs
(3) Bearing:
R 0.75 2.4 58 0.50 .875 6 274 kips > 156 kips, ok
p
1
1
Thus, the plate / 10 / (A36) outer splice plate is ok, but bearing/
2 2
tearout still needs to be checked.
b. Inner plates:
(1) Gross and net area: The load to each plate is 156/2 78 kips.
The gross area in tension required is

78
A gt 5 5 2.41 in 2
0.9 3 36

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