Research on the Estimation Method of the Stiffness Degeneration Index of Reinforced Concrete Members

Table 5

Performance classification levels of the reinforced concrete members based on the value of D_K,k.

No.	DK,k	Damage stages	Performance levels	Performance status
1	DK,k ≤ 0	No cracking	No damage	Intact
2	0 < DK,k ≤ 0.3	Cracking of the concrete	Mild damage	Repairable
3	0.3 < DK,k ≤ 0.7	Slight spalling of the concrete	Moderate damage
4	0.7 < DK,k ≤ 0.9	Severe spalling of the concrete	Severe damage	No collapse
5	0.9 < DK,k ≤ 1	Buckling of the longitudinal reinforcement	Destruction	Collapse