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

Table 5

Seismic damage index.

Earthquake damage grade	Basically intact	Slight damage	Medium damage	Severe damage	Destruction
Actual earthquake damage rate	19/89	18/89	25/89	9/89	18/89
Predicted earthquake damage rate	19/89	17/89	27/89	8/89	18/89
Seismic damage index Y	Y ≤ 1.39	1.39 ＜ Y ≤ 2.04	2.04 ＜ Y ≤ 3.87	3.87 ＜ Y ≤ 4.82	Y ＞ 4.82