Fragility of Bridge Columns under Vehicle Impact Using Risk Analysis

Table 2

Factors for risk analysis.

Types of risk analysis	Detailed factors		Existence (yes/no) or grade (1 to 3 points)
Preliminary risk analysis (PRA)	Existence of bridge column		Yes/no
	Type of bridge column		Yes/no
	Existence of lower road near bridge		Yes/no
			1 point	2 points	3 points
Simplified risk analysis (SRA)	Occurrence	Type of lower road	National highway, other road	General highway, local road	Metropolis road, city road
		Existence of bridge column within 9 m of road verge	No	—	Yes
		Distance from industrial complex (km)	95.30 < data	5.77 < data < 95.30	Data < 5.77
		Truck accessibility to the road	No	—	Yes
	Vulnerability	Service year	Data ≤ 10	10 < data ≤ 25	25 < data
		Safety level	Level A	Level B	Level D
		Number of columns	3 ≤ data	x = data	x = data
		Minimum diameter of column (m)	1.6 ≤ data	1.2 ≤ data < 1.6	Data < 1.2 m
		Slenderness ratio	Data < 6	6 ≤ data < 13	13 < data
		Design load (kN)	KL-510 (510)	DB-24 (432)	DB-18 (354)