Hysteretic Behavior of H-Shaped Honeycombed Steel Web Composite Columns with Rectangular Concrete-Filled Steel Tube Flanges

Table 3

The equation of the skeleton curve.

Section	Regression equation	Slope
OD	P/P^+max = 4.81 (Δ/Δ^+max)	4.81
DE	P/P^+max = 0.98 (Δ/Δ^+max) + 0.68	0.98
EF	P/P^+max = －0.42 (Δ/Δ^+max) + 1.14	−0.42
OC	P/P^−max = 4.73 (Δ/Δ^−max)	4.73
CB	P/P^−max = 1.00 (Δ/Δ^−max) − 0.66	1.00
BA	P/P^−max = －0.41 (Δ/Δ^−max) − 1.12	−0.41