基于数据库的无腹筋FRP筋混凝土梁受剪承载力误差分析

Database-based error analysis of calculation methods for shear capacity of FRP-reinforced concrete beams without web reinforcement

基于国内外已发表文献中的受剪承载力试验数据,建立了样本容量为461的无腹筋FRP筋混凝土梁受剪承载力试验数据库.综合分析了混凝土抗压强度、梁宽度、梁有效高度、剪跨比、FRP筋配筋率以及FRP筋弹性模量等6个因素对无腹筋FRP筋混凝土梁受剪承载力的影响,并对各规范建议公式以及各修正计算公式预测效果进行评价.结果表明,各计算方法对尺寸效应和剪跨比的考虑并不一致,均存在不同程度的保守计算,各因素与受剪承载力之间存在较好的相关性.在各规范建议公式中,CSA/CAN-S806-2012的预测效果较为准确,ACI440.1R-2015的预测效果最为保守,CNR-DT203-2006的安全度最低.在各修正计算公式中,Ahmed-2021的预测效果较为准确,Alam-2013最为保守,Mari-2014的安全程度最低.

A comprehensive database consisting of 461 samples was established considering the shear capacity experimental data from the literature.The effects of six factors,namely the concrete compressive strength,beam width,effective depth,shear span-to-depth ratio,reinforcement ratio,and elastic modulus of fiber-reinforced polymer bars,on shear capacity were analyzed.Furthermore,the prediction performance of each calculation method was evaluated.The results revealed inconsistencies among the calculation methods regarding the consideration of the size effect and the shear span-to-depth ratio,with varying degrees of conservatism in their predictions.Strong correlations existed between the factors and the shear capacity.Among the design provisions recommended by different countries,CSA/CAN-S806-2012 exhibited the most accurate prediction,while ACI440.1R-2015 demonstrated the highest level of conservatism,and CNR-DT203-2006 exhibited the lowest safety margin.Regarding the calculation models proposed by scholars,Ahmed-2021 reported the most accurate prediction,Alam-2013 was the most conservative,and Mari-2014 exhibited the lowest safety level.