GATE CE 2019 Set 1 — Question 43
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Structural Engineering → Connections & Plastic Analysis → Plastic Analysis (Beams)
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Question
If the section shown in the figure turns from fully-elastic to fully-plastic, the depth of neutral axis (N.A.), , decreases by

Correct answer
(C) 13.75 mm
Solution
1.Elastic Neutral Axis (from top):
Total Area .from the top.
2.Plastic Neutral Axis (from top):
The plastic neutral axis divides the area into two equal halves ( each).Since the flange area is exactly , the plastic N.A. lies at the junction of the flange and the web.
from the top.
3.Decrease in :
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