Reliability-based design analysis of FRP shear strengthened reinforced concrete beams considering different FRP configurations
Reliability-based design analysis of FRP shear strengthened reinforced concrete beams considering different FRP configurations
复制标题
考虑不同FRP配置的FRP剪力增强钢筋混凝土梁的基于可靠性的设计分析
DOI：
10.1016/j.compstruct.2020.111957
复制
发表时间：
2020-04-01
影响因子：
6.3
通讯作者：
Huang, Xiaoxu
中科院分区：
文献类型：
--
作者：
Zhou, Yingwu;Zhang, Jiaxin;Huang, Xiaoxu
与FRP受弯钢筋混凝土（RC）梁相比，其受剪加固机理复杂，脆性剪切破坏更具灾难性。为保证结构安全，有必要对FRP抗剪加固混凝土梁进行可靠度评估。基于荷载和阻力系数设计（LRFD）原理，对FRP抗剪加固RC梁进行了基于可靠性的设计分析，并考虑了不同FRP结构（u型护套、侧粘接和完全包裹）。在构建的数据库基础上，对几种FRP抗剪承载力预测模型进行了评价。对设计因子进行了可靠性分析和标定。结果表明：(1)对于u型护套和侧粘结型FRP抗剪承载力，Chen和Teng模型的预测精度最高，而对于全缠绕型FRP抗剪承载力，Khalifa模型的预测精度最高。(2)完全包绕和侧粘接的可靠性指标最大、最小。(3)由于脱粘失效，u型护套和侧粘接难以满足较大的目标可靠性指标。(4)随着目标可靠性指标的增加，阻力折减系数格式比部分安全系数格式需要更大的FRP量。
Compared with FRP flexural strengthened reinforced concrete (RC) beams, the mechanism of shear strengthening is complex, and the brittle shear failure is more catastrophic. To guarantee the structural safety, it is necessary to evaluate the reliability of FRP shear strengthened RC beams. Based on the principle of load and resistance factor design (LRFD), the reliability-based design analysis for FRP shear strengthened RC beams was performed herein considering different FRP configurations (U-jacketing, side bonding, and complete wrapping). Several prediction models of FRP shear capacity were evaluated based on the constructed database. Reliability analysis and calibration of design factors were conducted. The results show that: (1) the Chen and Teng's model shows the highest accuracy in the prediction of FRP shear capacity for U-jacketing and side bonding type, while the Khalifa's model is the most accurate for complete wrapping type. (2) Complete wrapping and side bonding show the largest and smallest reliability index, respectively. (3) Due to the debonding failure, it is difficult to satisfy the large target reliability index for U-jacketing and side bonding. (4) With the increase of the target reliability index, the resistance reduction factor format requires a larger amount of FRP compared with the partial safety factor format.