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Question
In a beam under bending (for sagging bending), where is the maximum compressive strain observed ?
A.
At the bottom fibre
B.
Uniformly across the section
C.
At the top fibre
D.
At the neutral axis
Answer ( Option C)

At the top fibre

Solution

In a beam under sagging bending (positive bending moment), the beam curves downwards. This causes:
• Top fibres to compress.
• Bottom fibres to extend (tension).
• The neutral axis to remain unstressed (zero strain).
Therefore, the maximum compressive strain occurs at the top fibre of the beam.

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