Pseudo-static test and numerical analysis of prestressed UHPC/RC segmental pile-soil interaction

ZHUANG Yizhou; SONG Kunsheng; SONG Yongqing; LIU Mingqi

doi:10.11835/j.issn.2096-6717.2021.267

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Pseudo-static test and numerical analysis of prestressed UHPC/RC segmental pile-soil interaction

Civil Engineering | 更新时间：2023-09-19

- Pseudo-static test and numerical analysis of prestressed UHPC/RC segmental pile-soil interaction
- Journal of Civil and Environmental Engineering Vol. 45, Issue 5, Pages: 37-48(2023)
- 作者机构：
  
  1.浙江工业大学土木工程学院，杭州 310014
  2.福州大学土木工程学院，福州 350108
- 作者简介：
  
  ZHUANG Yizhou (1964- ), professor, PhD, main research interests: bridge engineering and building structure, E-mail: yizhouzhuang@qq.com.
- 基金信息：
  
  National Natural Science Foundation of China(51778147);Zhejiang Natural Science Foundation(LY17E080022)
- DOI：10.11835/j.issn.2096-6717.2021.267
  CLC： U443.22
- Received：09 June 2021，
  
  Published：25 October 2023
- 稿件说明：
移动端阅览
ZHUANG Yizhou, SONG Kunsheng, SONG Yongqing, et al. Pseudo-static test and numerical analysis of prestressed UHPC/RC segmental pile-soil interaction[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 37-48.
DOI：

ZHUANG Yizhou, SONG Kunsheng, SONG Yongqing, et al. Pseudo-static test and numerical analysis of prestressed UHPC/RC segmental pile-soil interaction[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 37-48. DOI： 10.11835/j.issn.2096-6717.2021.267.

摘要

整体式无缝桥中的混凝土基桩侧向刚度过大，难以满足桥梁的纵向变形，提出一种UHPC/RC材料串联形成的阶梯桩来满足整体桥纵向变形需求。设计制作了2根UHPC/RC阶梯桩模型（无、有预应力），并对其进行水平低周往复荷载试验，通过桩身破坏特点、滞回曲线、骨架曲线、等效黏滞阻尼比、刚度退化等研究其耗能能力及抗震性能。结果表明：无预应力阶梯桩的破坏位置在3倍桩径的埋深位置，桩身开裂时桩顶的位移荷载为8~10 mm；有预应力阶梯桩的破坏位置在6倍桩径的埋深位置，桩身开裂时桩顶的位移荷载为10~15 mm。说明预应力的施加能有效提高阶梯桩抗裂能力及抗震性能，并满足整体桥水平变形需求。采用OpenSees软件对阶梯桩支承的整体桥进行参数分析发现，预应力度、桩上下段长度比与刚度比增大均可提高阶梯桩的水平承载力与变形能力。

Abstract

The reinforced concrete piles (RC) in integral abutment bridges (IAB) are challenging to meet the longitudinal deformation of bridges with significant lateral stiffness. This paper proposes a new form of pile comprised of UHPC and RC piles in series to meet the longitudinal deformation demand of IAB. Tests were conducted for two UHPC/RC segmental piles (with or without prestressing). The failure characteristics

hysteretic behavior curves

skeleton curves

equivalent viscous damping ratio

and rigidity degeneration were developed using horizontal displacement loads. The failure position of the non-prestressed segmental piles is at the buried depth of three times the diameter of the pile

the displacement of the pile top when the pile cracks is 8-10 mm; the failure position of the prestressed segmental piles is at the buried depth of four times the diameter of the pile

The displacement of the pile top when the pile cracks is 10-15 mm. The results show that prestressing can effectively improve the resistance cracking capacity of step piles and seismic properties

while meeting the deformation requirements of IAB. The finite element model (OpenSees) was used for modeling and analysis. The analysis results show that the horizontal bearing capacity and deformation capacity of stepped pile can be improved by the increase of prestress degree

the ratio of length and stiffness of pile.

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Keywords

references

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