Study on mechanisms of anchorage creep-induced prestress loss in prestressed systems with varying anchorage lengths

IF 2.1 4区 材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
Kai Yang, Jinchao Liu, Bo Wang, Dingwei Luo
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Abstract

Prestress loss poses a significant risk to structural safety and must be carefully considered in the design of prestressed anchors. This study begins by analyzing the relationship between creep in the anchorage zone and prestress loss. Subsequently, creep tests were conducted to determine the creep parameters of the anchorage zone and the differences in creep behavior under varying anchorage lengths were compared. Based on the test results, numerical simulations were performed to investigate the evolution of mechanical behavior during prestress loss and the influence of anchorage length on long-term performance. The results indicated that the coupled process of prestress loss and creep could be characterized as creep behavior under variable load, where the load was correlated with the total displacement of the anchor. During prestress loss, the shear load distribution in the anchorage zone transitioned from a concentrated to a uniform pattern. Specifically, the shear load near the free section decreased while the shear load near the bottom increased. The boundary between these two regions remained relatively stable, ranging between 0.5 m and 0.75 m, regardless of anchorage length. Increasing the anchorage length significantly reduced the prestress loss during the first year. This reduction was attributed to the smaller shear force and creep deformation in the rear section, which constrained deformation in the front section and minimized retraction in the free section of the anchor. However, the effectiveness of increasing anchorage length diminished as the length continued to expand. These findings offer valuable insights into the influence of anchorage length on the long-term service capacity of prestressed anchors, guiding structural design and optimization.

Abstract Image

不同锚固长度预应力体系锚固蠕变引起预应力损失的机理研究
预应力损失对结构安全构成重大威胁,在预应力锚杆设计中必须认真考虑。本研究首先分析锚固区蠕变与预应力损失的关系。随后进行蠕变试验,确定锚固区蠕变参数,比较不同锚固长度下锚固区蠕变行为的差异。在试验结果的基础上,进行了数值模拟,研究预应力损失过程中力学行为的演变以及锚固长度对长期性能的影响。结果表明:预应力损失与徐变耦合过程可表征为变荷载作用下的徐变行为,其中荷载与锚杆总位移相关;预应力损失过程中,锚固区剪切荷载分布由集中向均匀过渡。其中,自由截面附近剪切荷载减小,底部附近剪切荷载增大。无论锚地长度如何,这两个区域之间的边界保持相对稳定,在0.5 m到0.75 m之间。增加锚固长度可显著降低第一年的预应力损失。这种减少是由于后段的剪切力和蠕变较小,这限制了前段的变形,并最大限度地减少了锚杆自由段的收缩。然而,随着锚固长度的继续扩大,增加锚固长度的有效性降低。这些研究结果为研究锚固长度对预应力锚杆长期使用能力的影响,指导结构设计和优化提供了有价值的见解。
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来源期刊
Mechanics of Time-Dependent Materials
Mechanics of Time-Dependent Materials 工程技术-材料科学:表征与测试
CiteScore
4.90
自引率
8.00%
发文量
47
审稿时长
>12 weeks
期刊介绍: Mechanics of Time-Dependent Materials accepts contributions dealing with the time-dependent mechanical properties of solid polymers, metals, ceramics, concrete, wood, or their composites. It is recognized that certain materials can be in the melt state as function of temperature and/or pressure. Contributions concerned with fundamental issues relating to processing and melt-to-solid transition behaviour are welcome, as are contributions addressing time-dependent failure and fracture phenomena. Manuscripts addressing environmental issues will be considered if they relate to time-dependent mechanical properties. The journal promotes the transfer of knowledge between various disciplines that deal with the properties of time-dependent solid materials but approach these from different angles. Among these disciplines are: Mechanical Engineering, Aerospace Engineering, Chemical Engineering, Rheology, Materials Science, Polymer Physics, Design, and others.
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