5.8-9 A laminated wood beam on simple sup- ports (figure part a) is built up by gluing together four 2 in. × 4 in. boards (actual dimensions) to form a solid beam 4 in. X 8 in. in cross section, as shown in the fig- ure part b. The allowable shear stress in the glued joints is 62 psi, the allowable shear stress in the wood is 175 psi, and the allowable bending stress in the wood is 1650 psi.

Mechanics of Materials (MindTap Course List)
9th Edition
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Barry J. Goodno, James M. Gere
Chapter6: Stresses In Beams (advanced Topics)
Section: Chapter Questions
Problem 6.3.5P: A simple beam that is 18 ft long supports a uniform load of intensity q. The beam is constructed of...
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5.8-9 A laminated wood beam on simple sup-
ports (figure part a) is built up by gluing together four
2 in. X 4 in. boards (actual dimensions) to form a solid
beam 4 in. X 8 in. in cross section, as shown in the fig-
ure part b. The allowable shear stress in the glued joints
is 62 psi, the allowable shear stress in the wood is 175 psi,
and the allowable bending stress in the wood is 1650 psi.
(a) If the beam is 12 ft long, what is the allowable
load P acting at the one-third point along the
beam, as shown? (Include the effects of the
beam's own weight, assuming that the wood
weighs 35 lb/ft³.)
shutter
2 in.
L/3
2 in.
3 in.
2 in.
2 in.
3 in.
2 in.
(a)
4 in.
4 in.
(b)
(c)
PROBLEM 5.8-9
Transcribed Image Text:5.8-9 A laminated wood beam on simple sup- ports (figure part a) is built up by gluing together four 2 in. X 4 in. boards (actual dimensions) to form a solid beam 4 in. X 8 in. in cross section, as shown in the fig- ure part b. The allowable shear stress in the glued joints is 62 psi, the allowable shear stress in the wood is 175 psi, and the allowable bending stress in the wood is 1650 psi. (a) If the beam is 12 ft long, what is the allowable load P acting at the one-third point along the beam, as shown? (Include the effects of the beam's own weight, assuming that the wood weighs 35 lb/ft³.) shutter 2 in. L/3 2 in. 3 in. 2 in. 2 in. 3 in. 2 in. (a) 4 in. 4 in. (b) (c) PROBLEM 5.8-9
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