Experimental and Numerical Study on the Compression Behavior of Square Concrete-Filled Steel Tube Stub Columns with Steel Fiber-Reinforced High-Strength Concrete

Table 5

Strength of test specimens.

Specimen	(kN)	(kN)	(kN)	(mm)	(mm)		(kN/mm)
HS-800	6007	6038	7632	7.00	28.88	4.13	875
CS-800-3	6261	7025	8402	7.03	31.16	4.43	1062
CS-800-10	6862	7400	8442	8.05	35.76	4.44	1120
CS-800-F10	6862	7627	8553	8.50	38.98	4.59	1125
HS-490	2473	2849	5620	3.79	57.70	15.22	880
CS-490-3	2726	3423	6127	4.50	106.50	23.67	882
CS-490-10	3332	3951	6745	4.68	112.16	23.97	960
CS-490-F10	3332	3958	7322	5.12	139.40	27.23	1040

: calculated test specimen strength based on the code provisions (KBC2016); : yield strength of test specimen; : ultimate strength of test specimen; : axial shortening of test specimen experiencing yield strength; : axial shortening of test specimen experiencing ultimate strength; : initial stiffness.