Numerical Analysis on Flexural Shear Behavior of Reinforced Concrete Beams Strengthened with Fiber-Reinforced Polymer Grid and Engineered Cement Composites

IF 3.1 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Buildings Pub Date : 2024-07-25 DOI:10.3390/buildings14082304

Xiaoyang Guo, Zaiyu Zhang, Qing Sun, Peng Tian

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引用次数: 0

Abstract

Strengthening reinforced concrete (RC) beams with fiber-reinforced polymer (FRP) grids and engineered cement composites (ECCs) can significantly enhance their shear capacity. However, the specific contributions of the components in reinforced RC beams remain unclear, necessitating further investigation into the flexural shear performance of RC beams. The numerical model was used to analyze the flexural shear performance of RC beams strengthened with an FRP grid and ECCs. Subsequently, the parameters affecting the flexural shear performance of beams were discussed. This included the compressive strength of concrete prism, the shear span ratio, the tensile strength of ECCs, the thickness of the ECC cover, the cross-sectional area of the FRP grid, and the number of FRP grid layers. Finally, a calculation formula was established to predict the shear capacity and verified by the outcomes from numerical models and experimental data. The findings indicated that the ECC-strengthened layer significantly contributed to increasing the shear capacity. Additionally, the FRP grids helped to reduce stress concentration in the flexural shear zone, thereby preventing premature concrete cracking. The max load increased by 8.06% when the ECC’s tensile strength increased from 4 MPa to 10 MPa. In addition, increasing the cover thickness from 8 mm to 20 mm caused the peak load to increase by 14.42%. The calculation formula introduced in this research accurately predicts the shear capacity of the oblique section of RC beams.

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用纤维增强聚合物网格和工程水泥复合材料加固的钢筋混凝土梁的挠剪行为数值分析

使用纤维增强聚合物（FRP）网格和工程水泥复合材料（ECC）加固钢筋混凝土（RC）梁可显著提高其抗剪能力。然而，这些成分在加固 RC 梁中的具体贡献仍不清楚，因此有必要进一步研究 RC 梁的抗弯抗剪性能。本文使用数值模型分析了使用玻璃钢网格和 ECC 加固的 RC 梁的抗弯抗剪性能。随后，讨论了影响梁抗剪性能的参数。这些参数包括混凝土棱柱体的抗压强度、剪跨比、ECC 的抗拉强度、ECC 覆盖层的厚度、FRP 网格的横截面积以及 FRP 网格的层数。最后，建立了预测剪切能力的计算公式，并通过数值模型和实验数据的结果进行了验证。研究结果表明，ECC 加固层对提高抗剪承载力有显著作用。此外，玻璃纤维网格有助于减少挠曲剪切区的应力集中，从而防止混凝土过早开裂。当 ECC 的抗拉强度从 4 兆帕增加到 10 兆帕时，最大荷载增加了 8.06%。此外，覆盖层厚度从 8 毫米增加到 20 毫米时，峰值荷载增加了 14.42%。本研究引入的计算公式可以准确预测 RC 梁斜截面的抗剪能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Buildings Multiple-

CiteScore

3.40

自引率

26.30%

发文量

1883

审稿时长

11 weeks

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