Residual Compressive Strength of High-Strength Concrete Exposed to Elevated Temperatures

Table 7

Statistical parameters for the assessment of models (485 data points).

Model	Statistical parameters for experimental to predicted ratio								Nonconservative data (%)
	Mean	SD	CV (%)	5^th percentile value	Min. value	Max. value	CC	R^2
Predictive models
Regression Model 1	1.00	0.24	23.9	0.63	0.24	1.93	0.89	0.80	—
Regression Model 2	0.99	0.28	28.7	0.59	0.21	3.61	0.87	0.76	—
Regression Model 3	1.00	0.24	23.6	0.62	0.23	1.97	0.89	0.80	—
Regression Model 4	0.98	0.25	25.3	0.57	0.22	1.69	0.87	0.75	—
Design models
Regression Model 5	1.77	0.59	33.5	1.00	0.49	4.33	0.84	0.70	5.6
Regression Model 6	1.60	0.44	27.6	1.00	0.41	3.48	0.85	0.72	4.7
Eurocode 2: EN 1992-1-2 [4]	1.31	0.80	60.7	0.68	0.27	15.09	0.83	0.69	25.8
ACI 216.1-07 [5]	1.44	1.10	76.4	0.81	0.36	14.54	0.87	0.76	17.9
ASCE Manual [6]	0.94	0.31	32.6	0.50	0.19	2.50	0.87	0.75	66.0
Kodur et al. [29]	1.23	0.42	34.0	0.71	0.26	6.42	0.88	0.78	19.4
Nielsen et al. [30]	1.67	1.99	119.8	0.68	0.26	9.71	0.89	0.79	31.1
Aslani and Bastami [31]	1.08	0.60	55.4	0.15	0.07	3.60	0.17	0.03	41.4
Choe et al. [32]	1.58	0.96	60.9	0.90	0.38	9.05	0.88	0.77	12.4
Phan and Carino [33]	1.57	0.90	57.5	0.91	0.40	10.37	0.89	0.79	7.6
Hertz [34]	2.15	1.95	90.7	0.80	0.63	10.00	0.87	0.75	18.6

SD, standard deviation; CV, coefficient of variation; CC, coefficient of correlation; R², coefficient of determination.