Earthquake Damage Assessment for RC Structures Based on Fuzzy Sets

Table 3

Damage degree and the limit value for different damage indices.

Seismic fortification level	Frequent earthquake	Moderate earthquake		Rare earthquake
Damage degree	Intact	Minor damage	Moderate damage	Severe damage	Collapse
Global damage index	0~0.10	0.10~0.30	0.30~0.65	0.65~0.85	0.85~1.0
Number of inelastic cycles	—	—	10~20	4~10	0~4
Maximum interstory drift	0~1/450	1/450~1/300	1/300~1/150	1/150~1/50	>1/50
Coefficient of hysteresis energy concentration	1.0~2.073 + 0.046n	2.073 + 0.046n~2.854 + 0.084n	2.854 + 0.084n~3.346 + 0.113n	3.346 + 0.113n~3.554 + 0.132n	>3.554 + 0.132n