Behavior of Concrete-Filled Steel Tube Columns Subjected to Axial Compression

Table 1

List of columns for CFST columns without foundation.

Specimens		Ac	Ar	As	αsc (%)
PL-2	165  0  1200	21382	0	0	0
NS-A-2	165  1.2  1200	21382	0	622	2.9
NS-B-2	165  1.6  1200	21382	0	829	3.9
RN-2	165  0  1200	21382	170	0	0.8
RS-A-2	165  1.2  1200	21382	170	622	3.7
RS-B-2	165  1.6  1200	21382	170	829	4.7
PL-1	150  0  1200	17671	0	0	0
NS-A-1	150  1.2  1200	17671	0	570	3.2
RS-A-1	150  1.2  1200	17671	170	570	4.1
RS-B-1	150  1.6  1200	17671	170	762	5.2

Notation: : outside diameter of the circular steel tube; : wall thickness of the steel tube; : length of the specimens; Ac: concrete cross-sectional area; Ar: reinforced cross-sectional area; As: steel cross-sectional area; α_sc: steel ratio; PL: plain concrete; RS: concrete-filled steel tube column with reinforcing bars; NS: concrete-filled steel tube column without reinforcing bars; and RN: concrete column with reinforcing bars. A: thickness of steel tube is 1.2 mm; B: thickness of steel tube is 1.6 mm; 1: diameter is 150 mm; 2: diameter is 165 mm.