楔形锚固系统中 CFRP 筋的横向压缩破坏行为研究

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-12 DOI:10.1016/j.conbuildmat.2024.139094

Jie Xu , Qiang Cao , Weixin Wang , Yihang Liu

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引用次数: 0

摘要

楔形锚固系统因其施工方便、体积小、效率高而被广泛用于 CFRP 筋的锚固。然而，楔块间隙处的应力集中往往会造成 CFRP 筋的横向损坏，从而影响 CFRP 缆线的安全性。目前，对楔块引起 CFRP 筋横向压缩破坏行为的研究仍局限于定性描述，缺乏基本的理论支持。本研究探讨了 CFRP 筋的横向机械性能和压缩破坏行为。为了准确测定 CFRP 筋的横向力学性能，对其进行了横向压缩和剪切的棱柱试样试验。通过对 CFRP 筋进行匹配形压缩试验，研究了不同楔形间隙对压缩破坏行为的影响，并分析了楔形造成的压缩破坏机理。此外，还利用 LaRC05 复合材料失效准则预测了 CFRP 筋的压缩破坏行为。结果表明，楔形锚固中 CFRP 筋的压缩破坏主要是由于在缝隙边缘产生的横向剪切裂缝造成的。在压缩荷载作用下，这些裂缝向内扩展，直至肌腱塌陷。压缩破坏的程度受间隙宽度与肌腱直径之比 β 的显著影响。在相同的加载条件下，压缩破坏随着 β 的增大而加剧。采用数字图像相关分析 (DIC) 确定了不同 β 值下的临界破坏状态，并建立了临界等效接触压力 (pc) 与 β 之间的线性关系。LaRC05 复合材料失效准则准确地预测了 CFRP 筋的压缩裂缝形态和临界破坏状态。本文的研究成果为损伤控制提供了重要的理论支持，并为未来的锚固系统设计提供了宝贵的指导。

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Study on the transverse compression damage behavior of CFRP tendons in the wedge-type anchorage system

The wedge-type anchorage system is widely used for CFRP tendon anchoring due to its convenient construction, compact size and high efficiency. However, stress concentration at the gap between wedges often causes transverse damage in CFRP tendons, which compromises the safety of CFRP cables. Presently, research on the transverse compression damage behavior of CFRP tendons caused by wedges remains limited to qualitative descriptions and lacks essential theoretical support. This study investigates the transverse mechanical properties and compression damage behavior of CFRP tendons. Prismatic specimen tests for transverse compression and shear were conducted to accurately determine the transverse mechanical properties of CFRP tendons. By conducting matching shaped compression tests on CFRP tendons, the influence of different wedge gaps on compression damage behavior was examined, and the compression damage mechanism caused by wedges was analyzed. Furthermore, the LaRC05 composite material failure criterion was utilized to predict the compression damage behavior of CFRP tendons. The results indicate that compression damage of CFRP tendons in wedge-type anchorage primarily occurs due to transverse shear cracks initiating at the edges of the gaps. These cracks propagate inward under compression load until the tendons collapse. The extent of compression damage is significantly influenced by the ratio of gap width to tendon diameter

β

. Under the same loading conditions, the compression damage exacerbates with the increase of

β

. Digital Image Correlation (DIC) analysis was used to determine the critical damage state under various

β

values, and a linear relationship between the critical equivalent contact pressure (

p_{c}

) and

β

was established. The LaRC05 composite material failure criterion accurately predicts the morphology of compression cracks and critical damage states of CFRP tendons. The research results of this paper provide crucial theoretical support for damage control and offer valuable guidance for the future design of anchorage systems.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.