Determine the effective net area using the U values given on Table 3.2 An MC12x45 is connected through its web with 3 gages lines of 22mm diameter bolts. The gage lines are 76mm on center and the bolts are spaced 80mm on center along the gage line. If the center row of bolt is staggered with respect to the outer row, determine the effective net cross-sectional area of the channel. Assume there are four bolts in each line. Draw the figure first and label it properly. Draw the fracture path using different color or line weights.
Determine the effective net area using the U values given on Table 3.2 An MC12x45 is connected through its web with 3 gages lines of 22mm diameter bolts. The gage lines are 76mm on center and the bolts are spaced 80mm on center along the gage line. If the center row of bolt is staggered with respect to the outer row, determine the effective net cross-sectional area of the channel. Assume there are four bolts in each line. Draw the figure first and label it properly. Draw the fracture path using different color or line weights.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Determine the effective net area using the U values given on Table 3.2 An MC12x45 is connected through its web with 3 gages lines of 22mm diameter bolts. The gage lines are 76mm on center and the bolts are spaced 80mm on center along the gage line. If the center row of bolt is staggered with respect to the outer row, determine the effective net cross-sectional area of the channel. Assume there are four bolts in each line. Draw the figure first and label it properly. Draw the fracture path using different color or line weights.
Transcribed Image Text:TABLE 3.2 Shear Lag Factors for Connections to Tension Members
Description of Element
All tension members where the tension
load is transmitted directly to each of the
cross-sectional elements by fasteners or
welds (except as in Cases 4, 5 and 6).
All tension members, except plates and
HSS, where the tension load is transmitted
to some but not all of the cross-sectional
elements by fasteners or longitudinal
welds or by longitudinal welds in
combination with transverse welds.
Case
Shear Lag Factor, U
Example
1
U = 1.0
I.
U = 1 - X/l
(Alternatively, for W, M, S and HP, Case 7
may be used. For angles, Case 8 may be
used.)
U = 1.0
and
All tension members where the tension
load is transmitted only by transverse
welds to some but not all of the
cross-sectional elements.
= area of the directly
An
connected elements
4
Plates where the tension load is
12 2w... U = 1.0
2w >1 1.5w... U = 0.87 -
1.5w >12 w...U = 0.75
transmitted by longitudinal welds only.
12 1.3D... U = 1.0
DsI< 1.3D... U = 1 - x/l
X = D/T
5
Round HSS with a single concentric
gusset plate
6.
with a single con-
centric gusset plate
Rectangular HSS
12 H... U = 1 – x/l
H
B2 + 2BH
4(В + H)
with two side gusset
plates
12H... U =1 – x/l
H
B?
4(В + H)
W, M, S or HP
Shapes or Tees cut
from these shapes.
|(If U is calculated
per Case 2, the
|larger value is per-
mitted to be used.)
with flange con-
nected with 3 or
more fasteners per
line in the direction
of loading
7
b;2 2/3d... U = 0.90
bf < 2/3d ... U = 0.85
with web connected
with 4 or more fas-
U = 0.70
teners per line in the
direction of loading
8
Single and double
angles (If U is
calculated per
Case 2, the larger
value is permitted to
be used.)
with 4 or more fas-
U = 0.80
teners per line in the
direction of loading
with 3 fasteners
per line in the
direction of loading
(With fewer than 3
fasteners per line in
the direction of
U = 0.60
%3D
loading, use Case 2.)
| = length of connection, in. (mm); w =
width of rectangular HSS member, measured 90° to the plane of the connection, in. (mm); H = overall height of
rectangular HSS member, measured in the plane of the connection, in. (mm)
plate width, in. (mm); x = eccentricity of connection, in. (mm); B = overall
3.
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