An Improved Model of Variable Fuzzy Sets with Normal Membership Function for Crane Safety Evaluation

Table 4

Safety level for metal structure safety assessment of a port crane.

Safety level	Crack (C1)	Strength (C2)	Stiffness (C3)	Deformation (C4)	Corrosion (C5)
Very good I	0.9–1	0.6–1	0.8–1	0.8–1	0.8–1
Good II	0.8–0.9	0.4–0.6	0.6–0.8	0.6–0.8	0.6–0.8
Fair III	0.7–0.8	0.25–0.4	0.4–0.6	0.4–0.6	0.4–0.6
Poor IV	0.5–0.7	0.15–0.25	0.2–0.4	0.2–0.4	0.2–0.4
Very poor V	0–0.5	0–0.15	0–0.2	0–0.2	0–0.2