Mechanics of Materials, SI Edition
9th Edition
ISBN: 9781337093354
Author: Barry J. Goodno, James M. Gere
Publisher: Cengage Learning
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Chapter 9, Problem 9.5.38P
A frame ABC is loaded at point C by a force P acting at an angle öf to the horizontal (see figure). Both members of the frame have the same length and the same flexural rigidity.
Determine the angle a so that the deflection of point C is in the same direction as the load. (Disregard the effects of axial deformations and consider only the effects of bending due to the load P.)
Note: A direction of loading such that the resulting deflection is in the same direction as the load is called a principal direction. For a given load on a planar structure, there are two principal directions that are perpendicular to each other. 
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Chapter 9 Solutions
Mechanics of Materials, SI Edition
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