TY - JOUR
T1 - Experimental investigation on eccentric compression behavior of FRP-confined concrete-encased cross-shaped steel columns
AU - Pan, Molan
AU - Wang, Daiyu
AU - Wang, Zhenyu
AU - Yu, Tao
N1 - Funding Information:
The authors would like to acknowledge the financial support by the National Natural Science Foundation of China under project Nos: 51878224 .
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2023/1/1
Y1 - 2023/1/1
N2 - FRP-confined concrete-encased cross-shaped steel column (FCCSC), composed of an outer square glass-fiber-reinforced plastic (GFRP) tube, the internal cross-shaped steel, and the filled concrete, is a novel type of composite column. Eleven square FCCSCs were tested subject to eccentric axial compression load. The influence of eccentricity and slenderness ratio was evaluated and investigated. The test results showed that both the axial load-bearing capacity and lateral confinement efficiency of FRP tube reduced with the increase of eccentricity and slenderness ratio. The maximum reduction in axial load-bearing capacity was up to 50.7 % and 71.1 %, with the eccentricity varying from 0 mm to 50 mm and 100 mm, while the maximum reduction was about 18.1 % and 27.5 % when slenderness ratios increased from 10.44 to 20.87 and 34.79, respectively. The ductility of eccentric compressed FCCSCs can be evaluated by combined strain. It is indicated that short columns exhibited the best ductility, and the ductility increased with the increase of eccentricity. However, the ductility of slender columns reduced with the increase of eccentricity. Based on the test results, the experimental axial force (N)-moment (M) interaction curve of FCCSCs was obtained, and the balanced failure between compression and tension failure mode was recommended.
AB - FRP-confined concrete-encased cross-shaped steel column (FCCSC), composed of an outer square glass-fiber-reinforced plastic (GFRP) tube, the internal cross-shaped steel, and the filled concrete, is a novel type of composite column. Eleven square FCCSCs were tested subject to eccentric axial compression load. The influence of eccentricity and slenderness ratio was evaluated and investigated. The test results showed that both the axial load-bearing capacity and lateral confinement efficiency of FRP tube reduced with the increase of eccentricity and slenderness ratio. The maximum reduction in axial load-bearing capacity was up to 50.7 % and 71.1 %, with the eccentricity varying from 0 mm to 50 mm and 100 mm, while the maximum reduction was about 18.1 % and 27.5 % when slenderness ratios increased from 10.44 to 20.87 and 34.79, respectively. The ductility of eccentric compressed FCCSCs can be evaluated by combined strain. It is indicated that short columns exhibited the best ductility, and the ductility increased with the increase of eccentricity. However, the ductility of slender columns reduced with the increase of eccentricity. Based on the test results, the experimental axial force (N)-moment (M) interaction curve of FCCSCs was obtained, and the balanced failure between compression and tension failure mode was recommended.
KW - Composite column
KW - Confined concrete
KW - Cross-shaped steel
KW - Eccentric compression behavior
KW - FRP tube
UR - http://www.scopus.com/inward/record.url?scp=85140139303&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2022.116347
DO - 10.1016/j.compstruct.2022.116347
M3 - Journal article
AN - SCOPUS:85140139303
SN - 0263-8223
VL - 303
JO - Composite Structures
JF - Composite Structures
M1 - 116347
ER -