Numerical Investigation on Load-carrying Capacity of High-strength Concrete-encased Steel Angle Columns

Kim, Chang-Soo; Hwang, Hyeon-Jong

doi:10.1186/s40069-018-0238-7

International Journal of Concrete Structures and Materials

Table 1 Material and geometric properties of previous test specimens (Kim et al. 2014, 2017; Eom et al. 2014; Hwang et al. 2016).

From: Numerical Investigation on Load-carrying Capacity of High-strength Concrete-encased Steel Angle Columns

Tests specimens (total 16)	E1–E4: Eccentric axial load tests (Eccentricity = 120 mm) C1–C5: Concentric axial load tests F1–F7: Flexural tests
Dimensions (square section) (see Fig. 2)	\( b \) = 260 mm, \( b_{c} \) = 230 mm, \( L_{k} \) = 2620 mm for E’s \( b \) = 500 mm, \( b_{c} \) = 400 mm, \( L_{k} \) = 1500 mm for C1–C3 and F1–F4 \( b \) = 400 mm, \( b_{c} \) = 300 mm, \( L_{k} \) = 1500 mm for C4–C5 and F5–F7
Concrete^a	\( f^{\prime}_{c,u} \) = 103.6 MPa, \( \varepsilon_{co,u} \) = 0.0027, \( \varepsilon_{cu,u} \) = 0.003 for E1 \( f^{\prime}_{c,u} \) = 96.6 MPa, \( \varepsilon_{co,u} \) = 0.003, \( \varepsilon_{cu,u} \) = 0.003 for E2 and E3 \( f^{\prime}_{c,u} \) = 98.7 MPa, \( \varepsilon_{co,u} \) = 0.0032, \( \varepsilon_{cu,u} \) = 0.0032 for E4 \( f^{\prime}_{c,u} \) = 23.5 MPa, \( \varepsilon_{co,u} \) = 0.002, \( \varepsilon_{cu,u} \) = 0.003 for C’s and F’s
Steel angles (equal-leg)^a	\( f_{ys} \) = 812 MPa, \( f_{us} \) = 868 MPa, \( b_{s} \) = 60 mm, \( t_{s} \) = 15 mm for E1 \( f_{ys} \) = 759 MPa, \( f_{us} \) = 884 MPa, \( b_{s} \) = 60 mm, \( t_{s} \) = 15 mm for E2 – E4 \( f_{ys} \) = 444 MPa, \( f_{us} \) = 689 MPa, \( b_{s} \) = 90 mm, \( t_{s} \) = 7 mm for C’s and F’s
Transverse reinforcement (see Fig. 3)^a	Lattices of \( \phi 7 \) Bars (\( f_{yt} \) = 531 MPa, \( s_{t} \) = 50 mm) for E1 Links of D13 Bars (\( f_{yt} \) = 481 MPa, \( s_{t} \) = 100 mm) for E2 Battens of 6 \( \times \) 60 mm Plates (\( f_{yt} \) = 418 MPa, \( s_{t} \) = 210 mm) for E3 Spirals of D13 Bars (\( f_{yt} \) = 567 MPa, \( s_{t} \) = 100 mm) for E4 Links of D10 Bars (\( f_{yt} \) = 522 MPa) for C’s and F’s \( s_{t} \) = 100 mm for C2, C4, F2, and F5 \( s_{t} \) = 200 mm for C1, C3, C5, F1, F3, and F6 \( s_{t} \) = 300 mm for F4 and F7
Longitudinal reinforcement^a	8-D13 (\( f_{yl} \) = 513 MPa, \( f_{ul} \) = 634 MPa) for E1 4-D19 (\( f_{yl} \) = 523 MPa, \( f_{ul} \) = 650 MPa) for C1 and F1

^aElastic modulus = \( 3320\sqrt {f^{\prime}_{c}} + 6900 \) (MPa) for concrete, 205 GPa for steel plates including steel angles and battens, and 200 GPa for reinforcing steel bars including lattices, links, and spirals.

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