既有FRP筋混凝土板抗冲切承载力计算模型评估

Evaluation of existing punching shear capacity models of FRP reinforced concrete slabs

为了评估已有设计规范和文献中的FRP筋混凝土板冲切承载力计算模型的精度,通过收集文献中已有的FRP筋混凝土板试验数据并和已有模型预测结果进行对比。结果表明影响计算模型的主要因素是FRP筋配筋率、混凝土强度和有效板厚。在所有模型中,El-Gamal模型的计算值与试验值吻合程度最好;Nguyen-Minh提出的模型考虑的因素最多,但该模型预测精度还有待提高;在各规范模型中,加拿大规范考虑的因素最为全面且预测精度最好;日本、英国等国家设计规范模型结果的理论值和试验值吻合较好;我国规范模型精度较低,且偏于不安全。该研究可为今后进一步提高FRP筋混凝土板冲切计算模型精度提供思路和方向。

To evaluate the accuracy of the existing punching shear capacity modelsof FRP bar reinforced concrete slabs,a group of experimental data of FRP concrete slabs is collected and compared with these models.The results indicate that the key factors that affectthe punching shear capacity of FRP concrete slabs include the FRP reinforcement ratio,the concrete strength,and the effective depth of slabs.El-Gamal’s model provides the best prediction among the existing models.Nguyen-Minh’s model considers the most versatile parameters,but the accuracy still needs to be improved.Among the existing code-based formulas,the Canadian formula gives the best prediction and the models in the JSCE and BS codes agree well with experimental results.The model in the GB codeoverestimates experimental results.This paper can serve as a reference for the further improvement of existing punching shear capacity models of FRP concrete slabs.