FRP加固管桩在砂土中的水平承载性能

摘要/Abstract

摘要： FRP 材料具有轻质、高强和耐腐蚀等特点,将 FRP 与混凝土结合用于加固桩基础,不仅提高了桩基础的承载能力,还可以改善耐久性.为了明确 FRP 加固管桩在砂土中的水平承载性能,利用自行设计的水平双向桩模型试验系统,对埋入砂土中的FRP加固管桩模型桩施加双向水平荷载,研究了砂土与FRP加固管桩的水平承载性能.基于试验结果建立砂土的弹塑性模型,假定地基反力系数为常数,基于桩的挠曲微分方程,给出了FRP加固管桩的位移和弯矩的解析解.通过与试验结果对比分析,验证了本文计算方法的正确性;并分析了荷载的大小、地基反力系数、桩身抗弯刚度对塑性高度的影响,研究了FRP加固管桩桩身弯矩和桩身位移随地基反力系数和桩身抗弯刚度的变化规律.

关键词: FRP, 管桩, 砂土, 相互作用, 试验研究, 理论分析

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

中图分类号:

TU473

韩大勇, 高亮, 李东, 赵英爱. FRP加固管桩在砂土中的水平承载性能[J]. 兰州理工大学学报, 2025, 51(1): 123-128.

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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