Semiquantitative Fire Risk Grade Model and Response Plans on a National Highway Bridge

Table 2

Maximum surface temperature of steel bridges according to mobilization time criteria and vertical clearance (130 MW). Unit: °C.

Mobilization time criteria for fire suppression (min)	Vertical clearance (m)
	4	5	6	7	8	9	10	11	12	13	14	15
I (0–5)	209	148	107	79	60	48	41	35	32	29	28	26
II (5–8)	323	327	323	302	285	242	215	169	155	111	103	78
III (8–10)	371	396	402	393	377	337	295	243	220	165	137	110
IV (10–20)	589	658	684	678	659	595	533	449	370	284	226	178
V (more than 20)	1001	1000	981	927	871	764	679	570	480	365	305	237