Study on Mechanical Behavior of Fully Encased Composite Slender Columns with High-Strength Concrete Using FEM Simulation

Table 14

Ductility index of columns due to spacing of tie bars.

Column type	Column ID	Concrete Fck(MPa)	S (mm)	Peak axial load (P)	Axial deformation		Ductility index (μ = Δ0.75p/Δp)
					Δ	Δ0.75p
RCC	RHC1s1	90	100	7442.67	43.35	46.38	1.07
	RHC1s2		150	7350.93	23.52	24.77	1.05
	RHC1s3		50	7734.38	42.69	46.44	1.09
FECC-C	CSHC1s1	90	100	8320.52	42.34	47.48	1.12
	CSHC1s2		150	8201.11	41.55	46.17	1.11
	CSHC1s3		50	8620.64	43.99	51.08	1.16
FECC-I	ISHC1s1	90	100	8074.95	43.74	48.12	1.10
	ISHC1s2		150	7853.53	41.02	44.72	1.09
	ISHC1s3		50	8315.56	44.07	50.24	1.14
FECC-R	RSHC1s1	90	100	7649.10	43.49	48.28	1.11
	RSHC1s2		150	7441.27	40.35	44.39	1.10
	RSHC1s3		50	7956.81	45.00	51.40	1.14