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收集国内外218组纤维增强复合材料(FRP)筋混凝土梁受弯性能试验结果,重点研究了正常使用阶段和极限状态下梁挠度和裂缝宽度的发展规律,基于试验数据修正了FRP筋应变不均匀系数ψ与强度配筋影响系数的关系,建立了该类梁受弯挠度计算模型;深入分析了FRP筋混凝土梁受弯截面内力臂系数η、构件受力特征系数αcr对构件裂缝宽度计算精度的影响,确定η,αcr的合理取值,优化计算模型,并与规范GB 50608—2010建议模型计算值进行对比分析。结果表明:根据建立的ψ与强度配筋影响系数关系,选取η=0.88,α_(cr)=1.5得到的建议模型能够较好预测FRP筋混凝土梁受弯挠度和裂缝宽度,比规范计算结果吻合好,验证了建议模型的准确性和合理性。
The flexural performance of 218 reinforced concrete (FRP) reinforced concrete beams at home and abroad were collected. The development of beam deflection and crack width under normal use and extreme conditions were studied. Based on the experimental data, the strain of FRP tendons was corrected. Coefficient ψ and the influence coefficient of strength reinforcement, the calculation model of bending deflection of this kind of beam is established. The calculation precision of the crack width of members is also deeply analyzed. Influence, determine the reasonable value of η, αcr, optimize the calculation model, and compare with the calculated value of the proposed model GB 50608-2010. The results show that the proposed model with η = 0.88 and α - (cr) = 1.5 can predict the flexural deflection and the crack width of FRP reinforced concrete beams better than the calculated results according to the relationship between ψ and strength reinforcement influence coefficient. Well, the proposed model is validated for its accuracy and rationality.