Analysis of Bridge Health Detection Based on Data Fusion

Table 3

Grading standard of risk indexes.

	Probability		Harmfulness		Premonitory
	Quality	Quantity	Quality	Quantity	Quality	Quantity
1	Rare		Insignificant	Q ≤ 0.125%	Common sense judgment	t > 12 h
2	Occasional		Sight	0.125% < Q ≤ 1.25%	Infer with professional knowledge	3 h < t ≤ 12 h
3	Possible		Serious	1.25% < Q ≤ 12.5%	Professional tool calculation	0.5 h < t ≤ 3 h
4	More possible		Extremely serious	Q >12.5%	Unpredictable	t ≤ 0.5 h