Experimental and numerical parametric study on flexural behavior of concrete beams reinforced with hybrid combinations of steel and BFRP bars
Experimental and numerical parametric study on flexural behavior of concrete beams reinforced with hybrid combinations of steel and BFRP bars
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DOI：
10.1016/j.compstruct.2022.116230
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发表时间：
2022-09-21
影响因子：
6.3
通讯作者：
Wu, Zhishen
中科院分区：
文献类型：
--
作者：
Hussein, Ahmed;Huang, Huang;Wu, Zhishen
本研究研究了钢和玄武岩纤维增强聚合物 (BFRP) 筋混合钢筋混凝土 (HRC) 梁在两个层面上的弯曲性能，考虑了混凝土保护层、BFRP 筋的粘结滑移模型以及 BFRP 与钢区域的混合配筋率 (Af/As)。首先，测试了代表实验参考的具有不同混凝土覆盖层的五个实验样本。随后，使用有限元模型扩展了该研究，以研究 BFRP 筋的粘结特性、Af/As 比率和混凝土抗压强度对 HRC 梁性能的影响。结果表明，在受拉力最大的一侧添加BFRP筋可以显着改善钢材屈服后梁的结构性能。此外，HRC 梁的抗弯能力和屈服后刚度取决于所用 FRP 筋的粘结特性。最后，建议调整 Af/As 以满足挠度和变形能力的要求。
This study investigates the flexural performance of hybrid reinforced concrete (HRC) beams with steel and basalt fiber-reinforced polymer (BFRP) bars at two levels considering the concrete cover, bond-slip model of BFRP bars, and hybrid reinforcement ratio of the BFRP to steel areas (Af/As). First, five experimental specimens with different concrete covers representing an experimental reference were tested. Subsequently, the study was extended using a finite element model to investigate the effects of bond characteristics of BFRP bars, ratio Af/As, and concrete compressive strength on the HRC-beam performance. The results demonstrate that adding BFRP bars at the side with the highest tension can significantly improve the structural performance of the beam after steel yielding. Furthermore, the flexural capacity and post-yielding stiffness of the HRC beams are governed by the bond characteristics of the FRP bars used. Finally, recommendations are suggested to tune Af/As to fulfil the requirements of deflections and deformability.