Ultimate Limit Design of Strengthened Steel Columns by Mortar-Filled FRP Tubes

Table 4

Experimental and theoretical ultimate load-bearing capacities.

Specimens	Failure mode	Pexp (kN)	Pth (kN)	Difference between Pth and Pexp	PFeng2013 (kN) (corresponding to GB)
C70-5	LB	513.9	485.1 (LB)	−5.6%	—
C105-0	FS1	415.2	415.7 (FS)	0.1%	—
C105-2	FR (no discussion)	443.5	—	—
C105-5	FS2	435.5	415.7 (FS)	−4.5%
C140-5	GB	357.6	430.0 (GB)	20.2%	520.7
C175-5	GB	316.4	305.8 (GB)	−3.4%	339.5
I70-5	LB	421.1	466.5 (LB)	10.8%	—
I105-0	FS1	472.0	474.5 (FS)	0.5%	—
I105-2	LB	528.9	483.4 (LB)	−8.6%
I105-5	Machine malfunction	—	—	—
I140-5	LB	428.5	483.4 (LB)	12.8%	—
I175-5	GB	386.8	429.3 (GB)	11.0%	894.9

LB, local buckling at end of steel member; FS1 and FS2, FRP-tube splitting at end or on inside of wrapped area; FR, FRP-fabrics rupture; GB, global buckling.