碳纤维布加固锈蚀钢筋混凝土梁抗弯性能研究

通过锈蚀混凝土梁采用碳纤维增强材料(简称CFRP)加固前后的抗弯承载力试验,分析了二次受力、锈蚀两因素对钢筋混凝土梁承载力、刚度等方面的影响。研究结果表明,CFRP加固锈蚀钢筋混凝土梁,其承载力、刚度都有不同程度的提高,二次受力引起的CFRP布滞后应变将影响其高强抗拉强度的发挥,锈蚀钢筋混凝土梁材料力学性能的改变降低了CFRP布加固梁的抗弯承载能力。基于锈蚀钢筋混凝土梁材料力学特性,建立了CFRP布加固锈蚀混凝土梁受弯全过程的数值模拟技术,计算结果与试验结果符合较好,为今后锈蚀钢筋混凝土梁加固设计计算提供参考。

FLEXURAL BEHAVIOR OF CORRODED REINFORCED CONCRETE BEAMS STRENGTHENED WITH CARBON FIBER COMPOSITE SHEETS

Through the experiment of the bending capacity of the corroded reinforced concrete beams before and after strengthened with CFRP sheets,the influence of the secondary load and corrosion on the load-carrying capacity and rigidity of reinforced concrete beams was discussed.The results of the study show that the load-carrying capacity and rigidity of corroded reinforced concrete beams with CFRP sheets have been improved in different degrees.The lagged strain caused by the secondary load would influence the effect of its high tensile strength.And the change of mechanical properties of the corroded reinforced concrete beams reduced the bending capacity of beams strengthened with CFRP sheets.Based on the mechanical properties of the corroded reinforced concrete beams,the numerical simulation technology of the whole bending process of the corroded reinforced concrete beams strengthened with CFRP sheets was established.The good conformity of the calculation results and the experimental results can provide reference for the reinforcement design of the corroded reinforced concrete beams in the future.