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Fire endurance ratings for CFRP-strengthened RC column insulated with SFRM.
| Insulation | Criterion 1 (CFRP) | Criterion 2 (CFRP) | Criterion 3 (Side rebar) | Criterion 3 (Corner rebar) |
|---|---|---|---|---|
| Tg < 71 ℃ | Tig < 450 ℃ | Tr < 593 ℃ | Tr < 593 ℃ | |
| No insulation | 3.2 min | 11 min | 3.1 h | 1.3 h |
| 10-mm SFRM | 10 min | 1.4 h | – | 2.8 h |
| 20-mm SFRM | 19 min | 3.3 h | – | – |
| 30-mm SFRM | 32.4 min | – | – | – |
