Concept explainers
The maximum normal stress due to bending on section a-a.
Answer to Problem 48P
The maximum normal stress due to bending on section a-a is
Explanation of Solution
Show the free-body diagram of the entire beam as in Figure 1.
Determine the vertical reaction at point A by taking moment about point B.
Determine the vertical reaction at point B by resolving the vertical component of forces.
Determine the horizontal direction at point A by resolving the horizontal component of forces.
Shear force:
Show the calculation of shear force as follows;
Bending moment:
Show the calculation of bending moment as follows;
The bending moment at the section a-a is
Refer to Appendix C “Properties of Rolled-Steel Sections” in the textbook.
The section modulus for
Determine the maximum normal stress
Substitute
Therefore, the maximum normal stress due to bending on section a-a is
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Chapter 5 Solutions
Mechanics of Materials, 7th Edition
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