Effect of transverse and longitudinal reinforcement ratios on the behaviour of RC T-beams shear-strengthened with embedded FRP BARS

Effect of transverse and longitudinal reinforcement ratios on the behaviour of RC T-beams shear-strengthened with embedded FRP BARS
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横向和纵向配筋率对嵌入 FRP 筋抗剪加固 RC T 梁性能的影响

DOI:
10.1016/j.compstruct.2021.113622
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发表时间:
2021
影响因子:
6.3
通讯作者:
Sogut K
Sogut K
中科院分区:
工程技术1区
文献类型:
--
作者:
Sogut K

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七钢筋混凝土(RC)T梁,包括两个未加强(控制)梁和五个梁加强剪切与嵌入FRP筋,进行了试验失败。试验参数为钢-FRP抗剪配筋率和受拉配筋率。一个非线性有限元(FE)模型的开发,验证和用于进行参数研究。试验和有限元分析结果表明,混凝土和FRP对抗剪承载力的贡献以及总的抗剪承载力都随着钢-FRP抗剪配筋率的增加而降低。受拉配筋率影响试验梁和模型梁的破坏模式,但对抗剪强度的提高影响不显著。实验结果与有限元和混凝土协会技术报告55预测进行了比较。FE模型正确地再现了实验结果并给出了准确的预测,平均预测与实验的比值为1.04,而TR 55给出了保守的预测,平均预测与实验的比值为0.42。
Seven reinforced concrete (RC) T-beams, comprising two unstrengthened (control) beams and five beams strengthened in shear with embedded FRP bars, were tested to failure. The test parameters were steel-to-FRP shear reinforcement ratio and tension reinforcement ratio. A nonlinear finite element (FE) model was developed, validated and used to conduct parametric studies. The experimental and FE results showed that the concrete and FRP contributions to shear resistance as well as the total shear force capacity all decrease with increasing steel-to-FRP shear reinforcement ratio. The tension reinforcement ratio influenced the failure mode of the tested and modelled beams but had insignificant impact on shear strength enhancement. The experimental results were compared with the FE and Concrete Society Technical Report 55 predictions. The FE model correctly reproduced the experimental results and gave accurate predictions, with a mean predicted-to-experimental ratio of 1.04, whereas TR55 gave conservative predictions, with a mean predicted-to-experimental ratio of 0.42.
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