Mechanics of Materials (MindTap Course List)
9th Edition
ISBN: 9781337093347
Author: Barry J. Goodno, James M. Gere
Publisher: Cengage Learning
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Textbook Question
Chapter 5, Problem 5.11.1P
A prefabricated wood I-beam serving as a floor joist has the cross section shown in the figure. The allowable load in shear for the glued joints between the web and the flanges is 65 lb/in. in the longitudinal direction.
Determine the maximum allowable shear force Vmax,for the beam.
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5.11-5 A box beam is constructed of four
wood boards as shown in the figure part a. The
webs are 200 mm × 25 mm and the flanges are
150 mm x 25 mm boards (actual dimensions), joined
by screws for which the allowable load in shear is
F = 1.1 kN per screw.
(a) Calculate the maximum permissible longitudinal
spacing smax of the screws if the shear force V is
5.3 kN.
(b) Repeat part (a) if the flanges are attached to the
webs using a horizontal arrangement of screws as
shown in the figure part b.
Flange
Flange
25 mm Web
25 mm
Web
200 mm
200 mm
25 mm
25 mm
25 mm
25 mm
|-150 mm --|
- 150 mm
25 mm
25 mm
(a)
(b)
PROBLEM 5.11-5
Draw a FBD of section CD. Do not solve the rest of the problem
The Simply supported beam in Figure has a rectangular cross
section 120 mm wide and 200 mm high.
(1)Compute the reaction forces Ra and Point RE.
(2)Compute the maximum bending stress in the beam.
- --- AAIL
(4)Compute the bending stress at a point on section B that is 25 mm
below the top of the beam.
|15 kN
6 kN/m
100 mm
NA -
В
ID
100 mm
0.8 m
120 mm
2 m
1.0 m
RA
RE
(a)
Chapter 5 Solutions
Mechanics of Materials (MindTap Course List)
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