Bearing Capacity of Recycled Self-Compacting Concrete-Filled Circular Steel Tubular Long Columns Subjected to Axial Load

Table 1

Design parameters of the RSCCFCST columns.

Specimen ID	D (mm)	L (mm)	L/D	C	(mm)	D/t	(kN)
RSCS-1	140	500	3.57	30	3.63	38.56	1159	0.0143	−0.0083
RSCS-2	140	500	3.57	50	3.63	38.56	1312	0.0156	−0.0092
RSCS-3	140	500	3.57	60	3.63	38.56	1331	0.0168	−0.0102
RSCS-4	140	1000	7.14	30	3.63	38.56	1122	0.0133	−0.0074
RSCS-5	140	1000	7.14	50	3.63	38.56	1246	0.0149	−0.0088
RSCS-6	140	1000	7.14	60	3.63	38.56	1272	0.0152	−0.0097
RSCS-7	140	1500	10.71	30	3.63	38.56	1095	0.0123	−0.0064
RSCS-8	140	1500	10.71	50	3.63	38.56	1200	0.0135	−0.0079
RSCS-9	140	1500	10.71	60	3.63	38.56	1229	0.0141	−0.0085

Note: D and t are the outside diameter and thickness of the steel tube, respectively. L is the length of the column. C is the number of the RSCC strength grades. is the measured bearing capacity of the specimens. and are the measured ultimate longitudinal and circumferential strains of the specimens, respectively.