Abstract
In this paper, the aim is to discuss the applicability of polyethylene terephthalate fiber-reinforced polymer (PET FRP) in DSTC structures. PET FRP can improve the strength and stability of structures by providing constraints for concrete. Herein, experimental and response surface analyses of the axial compressive properties of PET FRP–concrete–steel double-skin tubular stub columns (DSTCs) based on 26 DSTC specimens subjected to axial compression testing are presented. The height of each DSTC specimen is 600 mm, the outer diameter is between 305 and 315 mm, and the thickness of the added concrete is 43 mm. The main parameters are the number of layers on the PET FRP, the compressive strength of the concrete, and the thicknesses of the steel tubes. The experimental results show that the ultimate load and ultimate axial strain can be significantly increased by increasing the number of PET FRP layers, reaching 27.34% and 28.79%, respectively. When the compressive strength of the concrete increases from C30 to C40, the ultimate load and ultimate axial strain values of the DSTCs increase by 12.54% and 8.99%, respectively. In addition, as the thickness of the steel tube increases from 6 to 8 mm, the ultimate load and ultimate axial strain increase by 34.95% and 118.90%, respectively. These results indicate that the introduction of PET FRP significantly improves the overall performance of DSTCs. Increasing the number of PET FRP layers helps to limit the circumferential strain of DSTCs. P6-S8-C40 has the best ultimate load-bearing capacity and ultimate axial strain capacity, which reach 3356.18 kN and 0.1992, respectively. The main purpose of this paper is to study the influences of the PET FRP thickness (in different layers), steel tube thickness, and concrete strength on the properties, damage mode and damage process of DSTCs.
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Data Availability Statement
Data sets generated during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work is financially supported by the Natural Science Foundation of Heilongjiang Province with Grant No. YQ2023E031, the Fundamental Research Funds for the Central Universities with Grant No. 3072023CFJ0206, the National Natural Science Foundation of China (NSFC) with Grant No. 51708092, and the Postdoctoral Research Foundation of China with Grant No. 2018M631894.
Funding
Natural Science Foundation of Heilongjiang Province, YQ2023E031, Hongguang Wang, Fundamental Research Funds for the Central Universities, 3072023CFJ0206, Hongguang Wang, National Natural Science Foundation of China, 51708092, Hongguang Wang, Postdoctoral Research Foundation of China, 2018M631894, Hongguang Wang.
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Liu, J., Du, J., Gao, S. et al. Multiscale Study on the Axial Compression Performance of PET FRP–Concrete–Steel Double-Skin Tubular Stub Columns. Int J Civ Eng (2024). https://doi.org/10.1007/s40999-024-00954-5
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DOI: https://doi.org/10.1007/s40999-024-00954-5