Shear failure and size effect of BFRP reinforced concrete beams considering aggregate size

JIN Liu; LU Kai; SONG Bo; JIANG Xuan; ang

doi:10.11835/j.issn.2096-6717.2021.096

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Shear failure and size effect of BFRP reinforced concrete beams considering aggregate size

Civil Engineering | 更新时间：2023-05-25

- Shear failure and size effect of BFRP reinforced concrete beams considering aggregate size
- Journal of Civil and Environmental Engineering Vol. 45, Issue 3, Pages: 34-43(2023)
- 作者机构：
  
  北京工业大学城市减灾与防灾防护教育部重点实验室，北京 100124
- 作者简介：
  
  JIN Liu (1985- ), PhD, professor, main research interests: concrete and concrete structure, E-mail: jinliu@bjut.edu.cn.
  DU Xiuli （corresponding author）， PhD， professor， E-mail： duxiuli@bjut.edu.cn.
- 基金信息：
  
  National Key Research and Development Program of China(2018YFC1504302);National Natural Science Foundation of China(51822801;51421005)
- DOI：10.11835/j.issn.2096-6717.2021.096
  CLC： TU377.9
- Received：25 February 2021，
  
  Published：25 June 2023
- 稿件说明：
移动端阅览
JIN Liu, LU Kai, SONG Bo, et al. Shear failure and size effect of BFRP reinforced concrete beams considering aggregate size[J]. Journal of Civil and Environmental Engineering, 2023, 45(3): 34-43.
DOI：

JIN Liu, LU Kai, SONG Bo, et al. Shear failure and size effect of BFRP reinforced concrete beams considering aggregate size[J]. Journal of Civil and Environmental Engineering, 2023, 45(3): 34-43. DOI： 10.11835/j.issn.2096-6717.2021.096.

摘要

粗骨料是混凝土材料的组成之一，其粒径变化会影响混凝土梁中骨料咬合作用对抗剪承载力的贡献。为了系统地考虑最大粗骨料粒径对玄武岩纤维增强聚合物（Basalt Fiber Reinforced Polymer，BFRP）筋无腹筋混凝土梁剪切破坏的影响，采用细观尺度数值模拟方法，建立BFRP筋无腹筋混凝土梁数值模型，模拟分析构件尺寸和粗骨料粒径对BFRP筋混凝土梁剪切破坏模式和抗剪强度的影响规律。结果表明：BFRP筋无腹筋混凝土梁的抗剪强度存在尺寸效应，同时，随着最大粗骨料粒径的增大，BFRP筋混凝土梁的抗剪承载力提高，梁的剪切尺寸效应被削弱。根据最大粗骨料粒径的影响机制与规律，结合断裂力学尺寸效应律，建立了BFRP筋混凝土梁抗剪强度尺寸效应理论公式，并与模拟结果和试验数据进行对比，验证了公式的准确性和合理性。

Abstract

Coarse aggregate is an important proportion of concrete material

and the change of its size will affect the contribution of aggregate interlock behaviour in concrete beams to shear capacity. In order to consider the effect of the coarse aggregate size on the shear failure of Basalt Fiber Reinforced Polymer (BFRP) beams without stirrup systematically

the meso-scale simulation was selected and a numerical model of BFRP reinforced concrete beams without stirrup was established. The effects of member size and coarse aggregate size on the shear failure mode and shear strength of BFRP reinforced concrete beams were simulated and analyzed. The results show that the size effect exists in the shear strength of BFRP reinforced concrete beams without stirrup. Meanwhile

the increase of the maximum aggregate size improves the shear capacity of concrete beam

and weakens the size effect of shear strength. According to the influence mechanism and law of maximum coarse aggregate size

theoretical formula of size effect on the shear strength of BFRP reinforced concrete beams was established on the basis of Fracture-SEL

and its accuracy and rationality are verified via experimental data.

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references

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