Experiment on Natural Frequency Change of Reinforced Concrete Members under Low Cycle Loading

Table 9

Coefficients of quadratic polynomial model Equation (12).

Coefficients	Specimen
	Z-1∼Z-9	J-1∼J-9	M-1∼M-9
	111.072	104.704	7.25751
	0.374128375718846	0.123087222141136	−0.182407588719503
	12.3712456256323	118.886313511019	86.0463796394658
	−1.61142709539306	−10.8999491603412	1.81975050928462
	0	0.540879978562249	1.58776166995393
	−0.0205457982698535	−0.0113599390393166	−0.0093710737740441
	−0.0246603388200758	−0.0468368467841787	0.0596143780058488
	6.6373455251616e − 05	0.00055949107587472	0.00146298647471792
	−2.72656082597941	−25.9877593894723	−24.8240056022407
	0	0.142689463548048	−0.162714814814822
Judgment coefficient ()	0.888816	0.718614	0.924151
Root mean square error	4.65158	10.5467	4.27426