Methodology and Application of Safety Evaluation of Reinforced Concrete Girder Bridges during Earthquakes

Table 7

Description of bridge damage at different levels.

Damage grade	Damage degree	Destruction description
Basically intact	Most serious	10% of nonload-bearing components were damaged
	Slightest	No damage
Slight damage	Most serious	50% of the piers were damaged in grade I, 10% of the piers were damaged in grade II, 10% of the supports were damaged, and 50% of the nonload-bearing members were damaged
	Slightest	10% of the piers were damaged in grade I and 10% of the nonload-bearing members were damaged
Medium damage	Most serious	50% of the piers were damaged in grade II, 10% of the piers were damaged in grade III, 10% of the supports were damaged, and all the nonload-bearing members were damaged
	Slightest	10% of the piers were damaged, 10% of the bearings were damaged, and 50% of the nonload-bearing members were damaged
Severe damage	Most serious	80% of the piers were damaged in grade III, 10% of the piers were damaged in grade IV, all the bearings were destroyed, and the bridge deck was cracked, or 10% of the girders had fallen
	Slightest	50% of the piers were damaged in grade III and 50% of the bearings were damaged, the girders were displaced and the bridge deck was cracked
Destruction	Most serious	All the bridge piers and nonload-bearing components were completely destroyed
	Slightest	40% of the piers were damaged in grade IV, 10% of the piers were damaged in grade III and the nonload-bearing components were almost completely destroyed