This paper introduces a novel and simple model for estimation of the shear contribution of the fiber-reinforced polymer (FRP) strengthening system in the FRP-strengthened beams. The model utilizes the bonding-based approach, which considers the shear resisting mechanism of FRP-strengthened beam via the bond behavior between FRP strengthening system and concrete. Herein, the beams strengthened in shear with near-surface mounting (NSM) rods or laminates and embedded through-section (ETS) bars are examined. By utilizing only mechanical consideration, the shear resistances of the NSM-strengthening or ETS-strengthening laminates or bars in the beams are simply derived when several bond factors (i.e. maximum bond stress and slip at peak bond stress) are known without using any empirical coefficients. The reliability of the proposed model is first validated against the test results available in the open literature. The extensive investigation to complement the model validation is then carried out through comparison of the results produced by the experiments and the proposed approach as well as the existing methods. The analyses demonstrate that the bonding-based approach is greatly effective to predict the shear contribution of the FRP strengthening system in the beam. Two examples for calculation of the shear resisting forces of the ETS-FRP and NSM-FRP bars in the FRP-strengthened beams are provided to depict the use of the model.

本文介绍了一种新颖而简单的模型，用于估算玻璃纤维增​​强梁中纤维增强聚合物（FRP）增强系统的剪切贡献。该模型采用基于粘结的方法，该方法通过FRP增强系统与混凝土之间的粘结行为来考虑FRP加固梁的抗剪机理。本文中，研究了使用近表面安装（NSM）杆或层压板和埋入式截面（ETS）杆在剪切作用下加强的梁。通过仅考虑机械因素，当已知多个粘结因子（即最大粘结应力和峰值粘结应力下的滑移）时，无需使用任何经验系数，就可以简单地得出梁中NSM加固或ETS加固的层压板或钢筋的剪切阻力。 。首先对照公开文献中提供的测试结果来验证所提出模型的可靠性。然后，通过比较由实验和提出的方法以及现有方法产生的结果，进行补充模型验证的广泛研究。分析表明，基于粘结的方法对预测FRP加固系统在梁中的剪切作用非常有效。提供了两个示例来计算ETS-FRP和NSM-FRP筋在FRP加固梁中的抗剪力，以描述模型的使用。然后，通过比较由实验和提出的方法以及现有方法产生的结果，进行补充模型验证的广泛研究。分析表明，基于粘结的方法对预测FRP加固系统在梁中的剪切作用非常有效。提供了两个示例来计算ETS-FRP和NSM-FRP筋在FRP加固梁中的抗剪力，以描述模型的使用。然后，通过比较实验和提出的方法以及现有方法产生的结果，进行广泛的研究以补充模型验证。分析表明，基于粘结的方法对于预测FRP加固系统在梁中的剪切贡献非常有效。提供了两个示例来计算ETS-FRP和NSM-FRP筋在FRP加固梁中的抗剪力，以描述模型的使用。