Strength gains of the axially and laterally loaded composite columns based on the concrete confinements provided by steel cores encased in structural concrete

Figures & data

Table 1. Geometrical properties of the composite columns and material properties (SRC5 and CL-TO)

SRC5 (Cross-shaped steel core, 29.8 MPa with a hoop of 75 mm)
Composite columns section (mm x mm)	D × B	280 × 280
Height of concrete column (mm)	D	280
Width of concrete column (mm)	B	280
		Vertical part	Horizontal part
Depth of H-steel section (mm)	h	175	175
Width of H-steel section (mm)	bf	90	90
Web thickness of H-steel section (mm)	tw	5	5
Flange thickness of H-steel section (mm)	tf	8	8
Rebar diameter (mm)	Ø	15.96
Concrete compressive strength (MPa)	f’c	29.8
Yield strength of rebar (MPa)	fyR	350
Yield strength of steel (MPa)	fyS	345
CL-TO (T-shaped steel core)
Composite columns section (mm x mm)	D × B	300 × 300
Height of concrete column (mm)	D	300
Width of concrete column (mm)	B	300
		Vertical part	Horizontal part
Depth of H-steel section (mm)	h	100	125
Width of H-steel section (mm)	bf	50	60
Web thickness of H-steel section (mm)	tw	5	6
Flange thickness of H-steel section (mm)	tf	7	8
Rebar diameter (mm)	Ø	19.05
Concrete compressive strength (MPa)	f’c	22.9
Yield strength of rebar (MPa)	fyR	388
Yield strength of steel (MPa)	fyS	333

Figure 1. Strain compatibility based on equivalent confining factors

Figure 1. Continued

Figure 2. Idealized equivalent confining factors considering confinements offered by the steel cores with and without lateral loads

Figure 3. Moment-curvature relationships accounting for vs. ignoring the confining effects by steel sections encased in columns of (cross-shaped column of Chen and Lin 2006)

Figure 4. Performance-based capacity of composite columns

Figure 4. Continued

Chen, C. C., and N. J. Lin. 2006. “Analytical Model for Predicting Axial Capacity and Behavior of Concrete Encased Steel Composite Stub Columns.” Journal of Constructional Steel Research 62 (5): 424–433. doi:https://doi.org/10.1016/j.jcsr.2005.04.021.

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