Experimental behaviour and design model of FRP-UHPC-steel tubular columns under monotonic axial compression

Zhang，Bing1; Zhou，Chong1; Zhang，Sumei1; Lin，Shuhong1; Fan，Zhihong2,3; Peng，Yutao1; Sun，Jiaming1; Lin，Guan4

2024-10-15

10.1016/j.compstruct.2024.118416

Composite Structures   影响因子和分区

0263-8223

By integrating structural steel with Fiber-Reinforced Polymer (FRP) and Ultra-High Performance Concrete (UHPC), FRP-UHPC-steel tubular columns (FUSTs) emerge as innovative composite members that offer exceptional corrosion resistance and lightweight properties. FUSTs hold significant potential for use as thin-walled tubular columns working in harsh environments, such as wind turbines and high-voltage transmission towers. To obtain in-depth understanding of key parameters including the steel fiber ratio of UHPC, the specimen void ratio and the FRP thickness, this paper tested 24 specimens to evaluate their compressive behaviour, including 18 FUSTs and 6 UHPC-filled FRP tubes (UCFFTs). Experimental results showed that: (1) FUSTs demonstrated ductile behavior with significant strain enhancement and notable strength improvement; (2) the steel fibers in UHPC had marginal influences on the ultimate condition of FUSTs; (3) a larger inner void had a general effect to lead to more localized rupture for the FRP tube; (4) the FRP thickness was the predominant influencing factor on both the general shape and the ultimate point of the normalized axial stress–strain curves. Finally, a design model was proposed, which was able to capture the general shape of the axial load–strain curves, and could generate reasonably accurate predictions for the peak load.

Axial compression Confinement FRP Tubular column Ultra-high performance concrete

SCI ; EI

英语

其他

MATERIALS SCIENCE

2-s2.0-85200493608

Scopus

1.School of Civil and Environmental Engineering,Harbin Institute of Technology (Shenzhen),Shenzhen,518055,China
2.Key Laboratory of Harbor & Marine Structure Durability Technology,Ministry of Transport,Guangzhou,510230,China
3.Key Laboratory of Construction Material,CCCC Fourth Harbor Engineering Institute Co.,Ltd,Guangzhou,510230,China
4.Dept. of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Zhang，Bing,Zhou，Chong,Zhang，Sumei,et al. Experimental behaviour and design model of FRP-UHPC-steel tubular columns under monotonic axial compression[J]. Composite Structures,2024,346.

Zhang，Bing.,Zhou，Chong.,Zhang，Sumei.,Lin，Shuhong.,Fan，Zhihong.,...&Lin，Guan.(2024).Experimental behaviour and design model of FRP-UHPC-steel tubular columns under monotonic axial compression.Composite Structures,346.

Zhang，Bing,et al."Experimental behaviour and design model of FRP-UHPC-steel tubular columns under monotonic axial compression".Composite Structures 346(2024).