Shear performance of basalt fiber composite RC beams with different laminated heights of basalt fiber

IF 3 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Structural Concrete Pub Date : 2024-08-15 DOI:10.1002/suco.202400032

Ting Xia, Wei Zhang, Min Huang, Hua Huang

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Abstract

Basalt fiber (BF) is known for its high tensile strength, low elastic modulus, and environmental friendliness. To investigate the influence of basalt fiber reinforced concrete (BFRC) lamination heights on the beams' shear performance, four basalt fiber reinforced concrete and reinforced concrete (BFRC‐RC) beams featuring diverse laminated heights were fabricated and underwent bending tests. To further investigate the impact of stirrup and shear span ratios on the shear performance of BFRC‐RC beams, finite element models (FEMs) were established based on the experiments. The results indicated that four test beams experienced diagonal shear failure. Compared to RC beams, BFRC‐RC beams exhibited heightened ductility and stiffness. Additionally, as the BFRC laminated height rose, both cracking and peak loads increased. Compared to BFRC‐RC beams without stirrups, stirrups in those beams transitioned the diagonal shear failure to flexural failure. Stirrups in BFRC‐RC beams increased both the yield and peak loads, thereby enhancing their ductility. With a reduction in the shear span ratio, BFRC‐RC beams increased in both yield and peak loads, accompanied by a simultaneous decrease in yield and peak displacement. Finally, a model incorporating the influence of laminated height on BFRC‐RC beams' behavior was introduced to predict their bearing capacity. The theoretical values aligned well with the experimental results.

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不同叠层高度玄武岩纤维复合 RC 梁的剪切性能

玄武岩纤维（BF）以高抗拉强度、低弹性模量和环保著称。为了研究玄武岩纤维加固混凝土（BFRC）叠合高度对梁剪切性能的影响，我们制作了四种具有不同叠合高度的玄武岩纤维加固混凝土和钢筋混凝土（BFRC-RC）梁，并对其进行了弯曲试验。为了进一步研究箍筋和剪切跨度比对 BFRC-RC 梁的剪切性能的影响，在实验的基础上建立了有限元模型（FEM）。结果表明，四根试验梁发生了斜剪破坏。与 RC 梁相比，BFRC-RC 梁表现出更高的延展性和刚度。此外，随着 BFRC 层叠高度的增加，开裂和峰值载荷也随之增加。与没有箍筋的 BFRC-RC 梁相比，这些梁中的箍筋使斜剪破坏过渡到了挠曲破坏。BFRC-RC 梁中的箍筋增加了屈服荷载和峰值荷载，从而提高了其延性。随着剪跨比的减小，BFRC-RC 梁的屈服荷载和峰值荷载都有所增加，同时屈服位移和峰值位移也有所减小。最后，我们引入了一个包含层叠高度对 BFRC-RC 梁行为影响的模型来预测其承载能力。理论值与实验结果非常吻合。

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来源期刊

Structural Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

5.60

自引率

15.60%

发文量

284

审稿时长

3 months

期刊介绍： Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.