双螺旋宏观 BFRP 纤维加固混凝土断裂能的实验和数值研究

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2024-03-18 DOI:10.1680/jmacr.23.00172

Chunlei Zhang, Xuejie Zhang

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引用次数: 0

摘要

有人提出了一种新型纤维--双螺旋宏 BFRP（玄武岩纤维增强聚合物）纤维，可有效提高混凝土的抗裂、抗拉强度和延展性。BFRP 材料具有抗拉强度高、耐腐蚀性好、成本低等优点，而双螺旋几何形状则为纤维和混凝土基体提供了出色的粘结滑移性能。本研究进行了一系列三点弯曲试验，以测量使用双螺旋 BFRP 纤维加固的混凝土的断裂能，并分析了纤维取向（对齐纤维和随机纤维）对开裂荷载、峰值荷载、抗弯强度和断裂能的影响。试验结果表明，使用双螺旋宏观 BFRP 纤维加固的混凝土的断裂能显著提高，与随机纤维相比，对齐纤维的断裂能提高了 26.4%。此外，与随机纤维相比，对齐纤维加固混凝土的抗弯强度提高了 29.7%。使用 LS-DYNA 软件建立了三点弯曲试验的有限元模型，并根据断裂能结果校准了由 Karagozian & Case, Inc.在素混凝土、FRC 和 FRCSS 的三点弯曲试验中，模拟值与试验最大载荷值之间的误差分别为 8.3%、4.0% 和 11.4%，这表明模拟结果与试验结果非常吻合。该研究为双螺旋 BFRP 纤维的实际工程应用提供了理论基础和技术支持。

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Experimental and numerical investigations on fracture energy of double-helix macro BFRP fiber-reinforced concrete

A novel type of fiber, the double-helix macro BFRP (Basalt Fiber Reinforced Polymer) fiber, has been proposed to effectively increase the cracking, tensile strength, and ductility of concrete. BFRP material offers high tensile strength, good corrosion resistance, and low costs, while the double-helix geometry provides excellent bond-slip performance for the fiber and concrete matrix. This study conducted a series of three-point bending tests to measure the fracture energy of concrete reinforced with double-helix BFRP fibers and analyzed the influences of fiber orientation (aligned fibers and random fibers) on cracking loads, peak loads, flexural strengths, and fracture energy. The test results revealed a significant improvement in the fracture energy of concrete reinforced with double-helix macro BFRP fibers, with aligned fibers showing a 26.4% higher fracture energy compared to random fibers. Additionally, the flexural strength of concrete reinforced with aligned fibers increased by 29.7% compared to random fibers. Finite element models of the three-point bending tests were established using LS-DYNA software, and the concrete model developed by Karagozian & Case, Inc.(K&C) was calibrated based on the fracture energy results to obtain the material model of the fiber-reinforced concrete considering fiber orientation. The errors between the simulated and tested maximum load values for three-point bending tests of plain concrete, FRC, and FRCSS were 8.3%, 4.0%, and 11.4%, respectively, which indicates that the simulation results were found to be in good agreement with the test results. This study provides theoretical foundations and technical support for the practical engineering applications of double-helix BFRP fibers.

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.