Durability Evaluation of Concrete Bridges Based on the Theory of Matter Element Extension—Entropy Weight Method—Unascertained Measure

Table 1

Bridge durability evaluation grade.

Durability grade	Condition description
I	Good condition, fully functional
II	Slightly damaged, with minor defects, no impact on the use of the bridge function
III	Medium damaged, with moderate defects, still able to maintain normal use function
IV	Severely damaged, the main components have large defects, significantly affecting the bridge function; cannot guarantee normal use
V	Extremely dangerous, the main components have severe defects; the main components cannot be used normally, endangering the safety of the bridge