Experimental and numerical investigation on shear behavior of concrete beams reinforced with CFRP grid shear reinforcements

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2024-09-02 DOI:10.1016/j.compstruct.2024.118552

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引用次数: 0

Abstract

This research investigated the shear behavior of concrete beams reinforced with Carbon Fiber Reinforced Polymer (CFRP) bars and grids as longitudinal reinforcements and stirrups, in experiment and finite element (FE) methods. Five concrete beams were tested under a monotonical load and experienced shear failure as expected. The test variables including stirrup ratio and grid dimension were considered to investigate the interaction between grid and concrete, and the influence between the horizontal and vertical fibers of the grid. It found that reducing the grid dimension with the constant stirrup ratio could effectively improve the stress distribution of the grid and the shear capacity of the beam. The grid dimension greatly determined the shear capacity of specimens when the stirrup ratio changed in a small range. The horizontal fibers of the grid had anchoring effects on the vertical fibers and directly carried the tensile stress from concrete at the top and bottom of the beam. In FE analysis, the fiber composite layer was adopted to simulate the CFRP grid. The load-midspan deflection of specimens and strain development of the grid in the FE model showed good agreement with the tests. In parameter analysis, the grid configuration with the horizontal fiber arranged in the middle or upper part of the section was recommended.

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用 CFRP 网格抗剪钢筋加固的混凝土梁抗剪行为的实验和数值研究

这项研究采用实验和有限元（FE）方法，研究了用碳纤维增强聚合物（CFRP）钢筋和网格作为纵向钢筋和箍筋的混凝土梁的剪切行为。五根混凝土梁在单调荷载下进行了测试，并如预期般出现了剪切破坏。试验变量包括箍筋率和网格尺寸，以研究网格与混凝土之间的相互作用，以及网格的水平纤维和垂直纤维之间的影响。研究发现，在箍筋比不变的情况下，减小网格尺寸可以有效改善网格的应力分布和梁的抗剪能力。当箍筋比在较小范围内变化时，网格尺寸在很大程度上决定了试样的抗剪能力。网格的水平纤维对垂直纤维有锚定作用，并直接承载来自梁顶部和底部混凝土的拉应力。在有限元分析中，采用纤维复合层来模拟 CFRP 网格。FE 模型中试件的荷载-中跨挠度和网格的应变发展与试验结果吻合。在参数分析中，建议采用水平纤维布置在截面中部或上部的网格配置。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.