Solid Waste Engineering
3rd Edition
ISBN: 9781305888357
Author: Worrell
Publisher: Cengage
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Chapter 9, Problem 9.3P
To determine
The justification for lower cost.
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A cantilever flexural member is
fabricated by bolting two identical C-
section steel shapes back to back as
shown in the figure. The beam has a
span of L = 1300 mm and supports a
concentrated load of P = 800 N. The
cross-sectional dimensions of the built-
up shape are shown in the figure.
Assume the section has a constant
thickness of t = 2.5 mm. Bolts of 3.5
mm diameter are installed at intervals of
s = 65 mm.[b = 100 mm, a = 25 mm]
b
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Determine the shear flow in the
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Five wood boards are bolted together to
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figure. The beam is subjected to a
shear force of V = 14 kips. Each bolt
has a shear strength of V bolt = 6 kips.
[h₁4 in., t₁ = 0.75 in., h₂ = 6.5 in., t₂ =
1.25 in.]
hi/2
h/2
h2
h:/2
hi/2
+
h2
Determine the moment of inertia of the
section.
Determine the shear flow in the section
connected by fasteners.
Determine the maximum allowable
spacing of the bolts.
Two built-up beams shown in the figure
below have the same dimensions and
are connected by the same types of
nails with the same spacing. Which
beam could carry more shear force if
the controlling factor is the shear flow in
the fasteners?
Nails
Beam (1)
Z
Beam (2)
Beam (2)
Beam (1)
Both are the same
Cannot answer without
knowing the shear diagram
Cannot answer without
knowing the modulus of
rigidity
Nails
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