Discussion
Consider the following statements about an unsymmetric section under a vertical moment:
1. The neutral axis is generally inclined to the horizontal.
2. The beam deflects horizontally as well as vertically.
3. The simple bending formula gives the correct stress.
Which of the statements given above is or are correct?
Answer: A
The first two are correct and describe the coupling the product of inertia introduces. The third is false: the simple formula assumes bending about a principal axis and gives the wrong answer here, so the general expression is required.
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