A Fluid-Structure Interaction Model for Bridge Safety Assessment under Scour Conditions

Table 6

Safety factors for different scour and flow velocity conditions.

(a) Allowable displacement method							(b) Ultimate moment method
Velocity	0.5	1	1.5	2	2.5	3	Velocity	0.5	1	1.5	2	2.5	3
depth							depth
0	—	—	—	—	—	—	0	—	—	—	—	—	—
2	—	—	—	—	—	—	2	—	—	—	—	—	—
4	5318	2825	1730	1167	836.3	607.5	4	996.9	1350	482.5	265.4	172	118.2
6	1697	806.8	463.4	315.3	222.4	161.9	6	554.2	220.2	116.4	74.2	51.8	37.3
8	592.9	283.9	165.7	113.0	80.6	58.2	8	231.4	92.8	56.8	38.5	27.1	18.5
10	305.3	139.8	93.4	59.9	38.6	27.9	10	343	68.4	43.7	26.2	14.2	9.9
12	172.8	76.7	48.6	31.7	20.9	15.1	12	198.4	28.8	22.1	14.7	8.7	6.0
14	106.2	46.0	29.5	19.1	12.4	8.9	14	159.8	17.3	14.6	9.9	5.7	4.0
16	69.7	29.6	19.1	12.3	7.9	5.7	16	132.5	11.1	10.2	7.0	4.0	2.8
18	48.0	20.0	13.1	8.4	5.3	3.8	18	112.3	7.5	7.4	5.2	2.9	2.0
20	34.4	14.1	9.3	5.9	3.7	2.7	20	96.8	5.3	5.6	4.0	2.2	1.5
22	25.5	10.3	6.8	4.3	2.7	1.9	22	84.7	3.8	4.3	3.1	1.7	1.2
24	19.3	7.7	5.1	3.2	2.0	1.4	24	74.9	2.8	3.4	2.5	1.3	0.9
26	15.0	5.9	3.9	2.5	1.5	1.1	26	67.0	2.2	2.7	2.0	1.1	0.7
28	11.9	4.6	3.1	1.9	1.2	0.8	28	60.3	1.7	2.2	1.7	0.9	0.6
30	9.5	3.7	2.5	1.5	0.9	0.6	30	54.8	1.3	1.9	1.4	0.7	0.5