Fire resistance of structural steel is improved by:
Choose the correct answer
Using higher strength steel grade
Passive fire protection: spray coatings, boards, intumescent paint, or concrete encasement to limit temperature rise
Steel inherently resists fire without protection
Adding sulphur to the steel alloy
Correct Answer
B. Passive fire protection: spray coatings, boards, intumescent paint, or concrete encasement to limit temperature rise
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Steel loses strength rapidly above 550°C (fy ≈ 60% of room temp fy at 600°C). Protection methods: (1) Spray-applied fire protection (vermiculite, mineral fibre); (2) Board protection (calcium silicate, gypsum); (3) Intumescent paint (expands at high temp to form insulating char layer); (4) Concrete encasement; (5) Water-filled hollow sections. IS 800 provides FRR requirements.
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