Effect of Concrete Age and Creep on the Behavior of Concrete-Filled Steel Tube Columns

Table 5

Ultimate load-bearing capacity of the axially compressed columns.

	(kN)	(×10^3 kN)
Concrete age (day)	0	1	3	7	14	28	1	3	7	14
Number 1	13.070	30.876	43.497	49.731	52.161	54.934	0.425	0.727	0.876	0.934
Number 2	19.235	38.841	51.250	57.432	59.979	63.839	0.440	0.718	0.856	0.913
Number 3	25.238	45.828	58.000	64.098	66.483	70.591	0.454	0.722	0.857	0.909
Number 4	31.084	52.171	64.129	70.131	72.343	76.533	0.464	0.727	0.859	0.908
Number 5	36.770	58.070	69.795	75.706	77.777	81.960	0.471	0.731	0.862	0.907

; is the load-bearing capacity when the concrete age is equal to 28 days.