Civil Engineering Reference
In-Depth Information
z
"
4"
6"
FIGURE E6.8
0.90
b
F
y
/E
F
all
/f
0.90
(
9
)
F
y
/E
√
22.0
/(
600
/
29.6
)
≥
t
pc
≥
≥
0.32 in. OK
F
all
f
=
1.04
≤
2OK
3
Vl
p
3
(
15
)(
18
)
2
(
0.35
)(
50
)(
9
)(
18
t
pc
≥
c)
≥
8
)
=
0.26 in. OK.
2
τ
all
b(l
p
−
−
A summary of the compression members is shown in Table E6.1.
Thebenefitsoftheperforatedplatecontributiontothecompressionmem-
ber area and moment of inertia, and the relative weakness of battened only
compression members is apparent in Table E6.1.
TABLE E6.1
Gross Area of Member
(Through Perforation for
Perforated Plates) (in.
2
)
Compression Member
Allowable Force (kips)
Solid
586
26.5 (wide flange only)
Laced
625
29.4 (channels only)
Battened
562
29.4 (channels only)
Perforated plated
576
25.6 (channels 17.64)
