Vibration-Based Damage Evaluation of a Reinforced Concrete Frame Subjected to Cyclic Pushover Testing

Table 2

Identified modal frequencies and damping ratios after impact tests.

Drift ratio (%)	f1 (Hz)			ζ1 (%)			f2 (Hz)			ζ2 (%)
	Test1	Test2	Test3	Test1	Test2	Test3	Test1	Test2	Test3	Test1	Test2	Test3
0	41.27	40.87	40.58	2.43	2.10	2.22	92.26	94.12	92.12	0.53	1.04	0.96
0.25	40.99	39.67	40.01	3.53	3.2	2.85	92.10	93.19	92.01	0.82	1.11	1.02
0.35	36.66	35.44	34.28	3.99	2.62	2.38	88.74	87.99	88.48	0.37	0.62	1.28
0.5	33.49	33.67	32.10	4.29	3.16	3.18	87.60	86.65	88.38	0.75	1.47	1.08
0.75	32.12	33.26	32.76	4.44	4.20	4.48	86.30	87.21	86.82	0.90	1.61	2.18
1	31.20	29.76	32.00	4.92	9.86	9.75	85.18	84.86	85.51	1.64	1.95	1.17
1.5	27.32	25.99	24.80	5.30	11.10	9.14	77.62	79.12	80.42	1.30	2.86	2.33
2	23.28	20.42	20.93	7.09	3.68	3.46	62.90	63.52	64.16	0.74	1.27	1.37
2.5	20.86	19.30	19.71	7.32	9.67	8.71	60.71	60.45	60.59	1.11	2.25	2.26
3.2	17.54	17.81	17.47	8.05	9.89	8.69	56.41	55.80	56.99	1.39	3.06	1.36
4	15.56	15.60	12.07	7.45	9.14	8.39	51.32	51.12	51.6	3.48	2.12	6.35
0.25	40.99	39.67	40.01	3.53	3.2	2.85	92.10	93.19	92.01	0.82	1.11	1.02