The assumption of ‘Plane section remains plane’ in Bending Theory means
- AStress profile is linear
- BStrain profile is linearCorrect
- CBoth stress and strain profile are linear
- DShear deformation is neglected
Solution
Concept
Plane sections remain plane
Step-by-step solution
1. Plane sections stay plane, so strain varies linearly across the depth. 2. Stress is linear only if the material is linear elastic.
Explanation
The assumption concerns geometry: strain is linear.
Why the other options are wrong
Stress is linear only for elastic materials.
Shortcut
Plane → linear strain.
Correct answer: B) Strain profile is linear