Identification of Sudden Stiffness Change in the Acceleration Response of a Nonlinear Hysteretic Structure

Table 11

Relative errors between identification results and theoretical values under Kobe earthquake wave.

Case	Time (s)	Relative error (%)
		k1	k2	ζ1	ζ2	Y	α	β	γ	n
Case 1	0∼10	0.15	0.10	7.00	8.50	6.82	0.00	12.00	12.00	2.00
	10∼30	0.51	0.29	6.00	7.50	4.91	0.00	14.00	12.00	3.00
Case 2	0∼10	1.25	0.14	11.00	8.00	5.93	0.00	6.00	14.00	2.50
	10∼20	1.10	0.29	6.00	9.00	6.91	0.00	12.00	14.00	1.50
	20∼30	1.17	1.04	6.00	7.50	4.60	0.00	12.00	10.00	2.00