Research on horizontal bearing performance of FRP reinforced pipe piles in sandy soil

Abstract

Abstract: FRP material has the characteristics of light weight, high strength and corrosion resistance. The combination of FRP and concrete to reinforce the pile foundation can not only improve the bearing capacity of the pile foundation, but also improve its durability. In order to clarify the horizontal bearing performance of FRP-reinforced pipe piles in sand, the self-designed bi-directional horizontal pile model test system was used, bi-directional horizontal loads were applied to the FRP-reinforced pipe pile model piles buried in sand, and the horizontal bearing performance of sand and FRP-reinforced pipe pile was studied. Based on the test results, an elasto-plastic model of sand was established, assuming that the foundation reaction coefficient is constant. And based on the deflection differential equation of pile, the analytical solutions of the displacement and bending moment of the FRP-reinforced pipe pile were given. The correctness of the calculation method in this paper was verified by the comparison with the test results, and the influence of the load, the foundation reaction coefficient, and the bending stiffness of the pile on the plastic height was analyzed. The variation laws of bending moment and displacement of FRP-reinforced pipe pile with foundation reaction coefficient and pile bending stiffness were studied.

Key words: FRP, pipe pile , sand, interaction, test study, theoretical analysis

CLC Number:

TU473

HAN Da-yong, GAO Liang, LI Dong, ZHAO Ying-ai. Research on horizontal bearing performance of FRP reinforced pipe piles in sandy soil[J]. Journal of Lanzhou University of Technology, 2025, 51(1): 123-128.

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