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On-line Access: 2021-06-16

Received: 2020-10-19

Revision Accepted: 2021-01-04

Crosschecked: 2021-08-24

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Tian-qi Zhang

https://orcid.org/0000-0003-0145-973X

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Journal of Zhejiang University SCIENCE A 2021 Vol.22 No.9 P.760-766

http://doi.org/10.1631/jzus.A2000477


Centrifuge model testing to ascertain vertical displacements of a pile under cyclic lateral loads


Author(s):  Gang Zheng, Ji-bin Sun, Tian-qi Zhang, Yang Jiao, Yu Diao

Affiliation(s):  School of Civil Engineering, Tianjin University, Tianjin 300072, China

Corresponding email(s):   tianqizhang@tju.edu.cn

Key Words:  Centrifuge model testing, Pile, Cyclic lateral load, Settlement


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Gang Zheng, Ji-bin Sun, Tian-qi Zhang, Yang Jiao, Yu Diao. Centrifuge model testing to ascertain vertical displacements of a pile under cyclic lateral loads[J]. Journal of Zhejiang University Science A, 2021, 22(9): 760-766.

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Abstract: 
piles, as the basic components that support superstructures, are inevitably subjected to cyclic lateral loads. The lateral response (deformation and capacity) of a pile under a cyclic lateral load has been well documented. However, little attention has been given to its vertical displacement. In this study, centrifuge model tests were conducted to study the vertical displacements of a pile under cyclic lateral loads. It was found that a pile may settle during cyclic lateral loading. Meanwhile, the ultimate settlement of the pile was larger when the vertical load or the amplitude of the horizontal displacement was greater. All the observations can be explained by the loss of mobilized shaft friction and the transmission of the unbalanced force to the pile tip.

水平循环荷载下单桩沉降的离心机试验研究

目的:探究单桩在水平循环荷载作用下的沉降行为.
创新点:1. 采用离心机模型试验,研究水平循环荷载作用下单桩的沉降规律;2. 揭示了水平循环荷载作用下单桩的沉降机理.
方法:1. 利用自主研发的伺服加载系统,在100g条件下对单桩施加水平循环荷载,并采用数字图像关联处理技术分析单桩的沉降规律;2. 同时针对两个重要参数(即竖向荷载和水平位移幅值)开展正交试验,明确两个参数对桩体沉降的影响.
结论:1. 在水平循环荷载作用下,桩侧摩阻力将会损失,不平衡力传向桩端,从而让桩体发生沉降;2. 作用在桩顶的竖向荷载越大,或水平位移幅值越大,桩沉降越大;3. 在水平循环荷载作用下,端承桩抗沉性能优于摩擦桩.

关键词:桩;水平循环荷载;沉降;侧摩阻力损失;不平衡力传递

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