Shear behavior of BFRP anchor-jointed rock mass considering inclination angle and pre-tension

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2024-09-03 DOI:10.1016/j.conbuildmat.2024.138157

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Abstract

In this study, the double-shear tests of anchor-jointed rock mass were carried out to investigate the mechanical behaviors of Basalt Fiber Reinforced Polymer (BFRP) anchor bolt in the joint surface. A total of 21 specimens were prepared and two main influence factors were considered: the inclination angle of the BFRP anchor bolt (0°, 5°, 10°, 15°) and the load level of pre-tension (36, 72, 108 kN). The parametric study and design recommendations for the shear capacity of the joint surface under the BFRP anchor bolt were carried out. The results showed that a larger inclination angle or pre-tension force can improve the shear capacity and reduce the relative dislocation at the joint surface. When the inclination angle was 15°, the ultimate bearing capacity was increased by 51 % compared with that when the inclination angle was 0°. When the pre-tension force was 108 kN, the ultimate bearing capacity was increased by 142 % compared with that without pre-tension force. The analytical study found that Ranjbarnia's formulations were reliable to calculate of the shear capacity at the joint surface. The predicted results showed good agreement with the experimental results, with the relative errors less than 5 % for all groups. Then, by using this analytical model, the design parameters of the BFRP anchor bolt were tentatively determined at demanded shear capacities of 200 kN and 350 kN, respectively.

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考虑倾斜角和预张力的 BFRP 锚固连接岩体的剪切行为

本研究对锚固连接岩体进行了双剪切试验，以研究玄武岩纤维增强聚合物（BFRP）锚杆在连接面上的力学行为。共制备了 21 个试件，并考虑了两个主要影响因素：BFRP 锚杆的倾斜角（0°、5°、10°、15°）和预拉力的荷载水平（36、72、108 kN）。对 BFRP 锚栓下接合面的抗剪能力进行了参数研究并提出了设计建议。结果表明，较大的倾斜角或预紧力可以提高剪切能力，减少接合面的相对错位。当倾斜角为 15°时，极限承载力比倾斜角为 0°时提高了 51%。当预紧力为 108 kN 时，极限承载能力比没有预紧力时提高了 142%。分析研究发现，Ranjbarnia 的计算公式对计算连接面的剪切承载力是可靠的。预测结果与实验结果一致，所有组的相对误差均小于 5%。然后，利用该分析模型，初步确定了 BFRP 锚栓的设计参数，要求的剪切承载力分别为 200 kN 和 350 kN。

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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.