An industrial 'chimney' (RC) is designed to resist:
Choose the correct answer
Only axial compression from self-weight
Wind (lateral, dynamic), self-weight, thermal gradient (hot flue gas), and seismic — IS 11504 governs RC chimney design
Only internal flue gas pressure
Only wind and self-weight (no thermal)
Correct Answer
B. Wind (lateral, dynamic), self-weight, thermal gradient (hot flue gas), and seismic — IS 11504 governs RC chimney design
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RC chimney: hollow tapered cylindrical shell. Loads: (1) Self-weight (DL); (2) Wind (primary lateral — IS 875 Part 3, dynamic analysis for slender chimneys); (3) Temperature differential (inside hot flue gas vs outside air → thermal gradient → bending/hoop stresses); (4) Seismic. Flue gas temperature: 150–500°C. Thermal stress can be significant. IS 11504 covers RC chimney design.
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