A T-beam behaves as a rectangular beam of width equal to its flange if its Neutral Axis
- ACoincides with centroid of reinforcement
- BCoincides with centroid of T-section
- CRemains within the flangeCorrect
- DRemains in the web
Solution
Concept
T-beam behaviour
Step-by-step solution
1. If the neutral axis lies in the flange, the compression zone is rectangular with width bf.
Explanation
The section then behaves as a rectangle.
Why the other options are wrong
NA in the web makes the zone T-shaped.
Shortcut
NA in flange → rectangular.
Correct answer: C) Remains within the flange