Fibre reinforced concrete (FRC) is increasingly used for structural purposes owing to its many benefits, especially in terms of improved overall sustainability of FRC structures relative to traditional reinforced concrete (RC). Such increased structural use of FRC requires safe and reliable models for its design in ultimate limit states (ULS). Particularly important are models for shear strength of FRC members without shear resistance due to the potential of brittle failure. The fib Model Code 2010 contains a model for the shear strength of FRC members without shear reinforcement and the same partial factor accepted for RC structures is accepted for FRC elements. This approach, however, is potentially on the unsafe side since the uncertainties of some design-determining mechanical properties of FRC (i.e., residual flexural strength) are larger than those for RC. Therefore, in this study, a comprehensive reliability-based calibration of the partial factor γ_c for the shear design of FRC members without shear reinforcement according to the fib Model Code 2010 model is performed. As a first step, the model error δ is assessed on 332 experimental results. Then, a parametric analysis of 700 cases is performed and a relationship between the target failure probability β_R and γ_c is established. The results demonstrate that the current model together with the prescribed value of γ_c = 1.50 does not comply with the failure probabilities accepted for the different consequences of failure of FRC members over a 50-year service life. Therefore, changes to the shear resistance model are proposed in order to achieve the target failure probabilities.

纤维增强混凝土 (FRC) 由于其许多优点而越来越多地用于结构目的，特别是在提高 FRC 结构相对于传统钢筋混凝土 (RC) 的整体可持续性方面。FRC 的这种增加的结构使用需要安全可靠的模型来设计极限状态 (ULS)。特别重要的是 FRC 构件的抗剪强度模型，由于存在脆性破坏的可能性，因此没有抗剪强度。该FIB模型规范 2010 包含一个没有抗剪钢筋的 FRC 构件的抗剪强度模型，并且 FRC 元件接受了为 RC 结构接受的相同部分系数。然而，这种方法可能是不安全的，因为 FRC 的某些设计决定机械性能（即残余弯曲强度）的不确定性大于 RC。因此，在本研究中，根据fib模型代码 2010 模型，对无抗剪钢筋 FRC 构件的剪切设计的部分因子γ _c进行了基于可靠性的综合校准。作为第一步，模型误差δ对 332 个实验结果进行评估。然后，对700个案例进行参数分析，建立目标失效概率β _R和γ _c之间的关系。结果表明，当前模型连同规定的γ _c  = 1.50值不符合 FRC 构件在 50 年使用寿命内失效的不同后果所接受的失效概率。因此，建议对剪切阻力模型进行更改，以实现目标失效概率。