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

Table 1

Maximum surface temperature of concrete 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)	909	726	567	364	288	202	157	124	104	81	74	64
II (5–8)	969	1030	1030	1020	1010	961	889	761	681	590	480	406
III (8–10)	987	1060	1080	1080	1060	1030	971	887	762	680	539	477
IV (10–20)	1050	1130	1130	1130	1120	1070	1030	906	856	725	641	561
V (more than 20)	1140	1160	1160	1150	1130	1070	1030	908	856	737	676	564