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

Table 4

The properties and the number of half-cycles corresponding to the damage for specimens S1 to S9 [22].

Group	No.	Vy (kN)	uy (mm)	ρw (%)	ρ (%)	Displacement pattern	The number of half-cycles corresponding to damage
							Cracking	Spalling	Severe spalling	Buckling
1	S1	47.69	10.25	0.226	0.587	B1-X	5	22	46	54
	S2	47.69	10.25	0.226	0.587	B1	6	21	48	51
	S3	47.69	10.25	0.226	0.587	B2	2	12	100	185
2	S4	84.89	12.75	0.226	1.198	B1-X	8	30	47	54
	S5	84.89	12.75	0.226	1.198	B1	6	20	47	54
	S6	84.89	12.75	0.226	1.198	B1-D	-	3	45	54
3	S7	85.97	13.32	0.804	1.198	B1-X	6	30	48	-
	S8	85.97	13.32	0.804	1.198	B1	5	29	52	-
	S9	85.97	13.32	0.804	1.198	B2	3	14	180	-