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Behavior of Splicing GFRP-Concrete-Steel Double-Skin Tubular Columns Subject to Eccentric Compression

  • Research Article-Civil Engineering
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Abstract

This paper designs the splicing GFRP-concrete-steel double-skin tubular column (DSTC) specimens based on steel bar connection, and the mechanical performance under eccentric compression load is investigated. The test parameters include the axial connection steel ratio, the load eccentricity and the hollow ratio. The results show that the splicing DSTCs present ductile failure under eccentric load, with the average deflection ductility coefficient of 4.21 and the axial shortening of more than 2% of the column height. The arranged connection steel cage prevents the joint failure, and the columns fail at the non-joint section, characterized by hoop rupture of the GFRP tube and concrete crushing at the same position. The proposed splice method satisfies the strength requirements, with more than 20% increase in the ultimate load compared with the continuous specimen, while the bearing capacity dose not increase with the increase of the axial connection steel ratio. Thus, it is suggested that the low axial steel ratio of 2.44% is used for the splicing DSTCs under relative small eccentricity (20 mm). The ultimate load decreases by about 25% with every 20 mm increase in load eccentricity, and the 40 mm eccentricity causes almost 50% reduction in the initial stiffness and doubles the lateral deflection compared with the axial compression member. The increase of hollow ratio decreases the ultimate load, the initial axial stiffness and also the ductility of the column. The theoretical calculation method for predicting the bearing capacity of the splicing DSTCs is experimentally verified.

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Acknowledgements

The experiments were conducted at 211 Test and Research Center of Northeastern University. The authors wish to gratefully thank for the support of these organizations for this study.

Funding

This work was supported by the National Outstanding Youth Science Fund Project of National Natural Science Foundation of China [Grant Number 51808100]; the Guidance Plan of Natural Fund of Liaoning Province [Grant Number 2019-ZD_0004]; and the Natural Science Foundation of Liaoning Province [Grant Number 20170540303].

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Authors and Affiliations

  1. College of Resources and Civil Engineering, Northeastern University, Shenyang, 110004, China

    Xue Li, Lian-guang Wang & Hai-yang Gao

  2. College of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China

    Ni Zhang

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  1. Xue Li
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  2. Lian-guang Wang
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Correspondence to Lian-guang Wang.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Li, X., Wang, Lg., Gao, Hy. et al. Behavior of Splicing GFRP-Concrete-Steel Double-Skin Tubular Columns Subject to Eccentric Compression. Arab J Sci Eng 47, 4955–4969 (2022). https://doi.org/10.1007/s13369-021-06335-7

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