The 'bending stress' in a plate girder flange is highest at:
Choose the correct answer
The neutral axis (zero stress there)
Extreme fibre of flange (farthest from neutral axis) where y is maximum: σ = M×(D/2)/I
At the web-flange junction only
At mid-flange width, not at the tip
Correct Answer
B. Extreme fibre of flange (farthest from neutral axis) where y is maximum: σ = M×(D/2)/I
AI Detailed Explanation & IS Code Reference
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Plate girder: I-section fabricated from plates (flanges + web). Bending stress σ = M×y/I. Bending stress in top/bottom flange: uniform across flange width in simple theory (but reduced by shear lag for wide flanges). Maximum bending stress at extreme fibre of flange = M×(D/2)/Ixx. Compressive flange: susceptible to lateral torsional buckling. Tension flange: fatigue (weld between flange and web — IS 1024/IS 800 Cl. 13). Fillet weld joins flange to web: carries horizontal shear flow q = VAȳ/I.
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