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
Why is this the answer?
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.
Related Steel Structures MCQs
More solved Steel Structures questions for AE/JE Civil Engineering exams.
- The 'residual stresses' in hot-rolled steel sections arise from:
- The 'effective slenderness ratio' for a single angle compression member (IS 800)...
- 'Fatigue failure' in steel structures occurs under:
- The 'tension field action' in a plate girder web after buckling means:
- Bolts in 'slip-critical' (HSFG) connections resist load by:
- The 'portal frame analysis' approximation for multi-storey frames under horizontal load...
Practice more Civil Engineering questions
This MCQ belongs to JE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.