Table 6.

Equations of design codes and literatures.

Codes	Shape	Equation
EC45	General CFST	(11)
EC45	Octagonal CFST short column	(12) (13) (14) where, the relative slenderness ratio is
GB5093670	General CFST	(15) (16) (17) (18)
ACI318-99 and AISC 360 − 165,71	General CFST	(19)
AISC 360 − 166	Octagonal CFST short column	(20) , where (21) (22) (23) (24)
DBJ72	General CFST	(25) (26) (27)
AIJ-200873	General CFST	(28)
Equation 10 of Ding et al.26	Octagonal CFST	(29)
Equation 14 of Ding et al.29	Hexagonal CFST	(30)
Equation of Yu et al.59	Solid, Holow, Circle, and Polygonal CFST	(31) where, (32)
Equation of Patel et al.25,74	Octagonal CFST	(33) where, (34)
Equation Li et al.30	Rectangular CFST	(35) (36) (37) (38)
Equation of Ahmed and Liang40	Octagonal CFST short column	(39)
Equation Nic J. Chen and T. M. Chan8	Octagonal CFST	(40)
Equation J. Chen and T. M. Chan8	Octagonal CFST	(41)
Equation Zhu and Chan60	Octagonal CFST	(42) where, is insribed diameter of octagonal section; and are the modification factors based on the inscribed circularsection of an octagonal section.
Equation Liu et al.60,75	Octagonal CFST	(43) (44) where, is confining pressure and is hoop stress in steel tube.
Equation Ramadan et al.28	Hexagonal CFST	(45)
Equation Nu with fscy modified MOHURD28,76	Hexagonal CFST	(46) (47) (48) (49) (50)
Equation Nu with fscy modified Han et al.28,77	Hexagonal CFST	(51) (52) (53) (54) (55) (56) (57)
Equation Nu with fscy modified Shen et al.28,31	Hexagonal CFST	(58) (59) (60) (61) (62)