海洋环境下碳纤维加固钢筋混凝土梁的力学性能分析

Mechanical Behavior of Corroded Reinforced Concrete Beams Strengthened with Carbon-fiber-reinforced-polymer in Marine Conditions

钢筋在恶劣环境下锈蚀是引发钢筋混凝土结构破坏的重要原因,本文针对海洋环境下混凝土构件在承受荷载作用的同时钢筋发生腐蚀的情况,进行模拟试验,测试两组不同条件下碳纤维加固钢筋混凝土梁在荷载与环境耦合作用下的挠度、中和轴高度变化、极限承载力以及破坏状态。在试验数据的基础上,对是否采用碳纤维加固以及采用不同碳纤维加固方式的混凝土构件之间的区别进行探讨,并进一步分析碳纤维加固后构件的力学性能及腐蚀对梁各受力部分的影响。试验结果和理论分析表明:适当提高碳纤维用量及选取合理的加固方式可以有效提高钢筋混凝土梁的力学指标并能减小构件的长期变形。

Corrosion of steel in aggressive environments causes considerable damages in the reinforced concrete（RC） structure.For real RC structures,corrosion of reinforcing bars takes place while they begin to carry load in marine conditions,corresponding simulated experiments are carried out in this paper.The main experiment parameters include the deflection,neutral axis,ultimate bearing capacity and failure mode of two different series of RC beams strengthened with carbon fiber reinforced polymer（CFRP） under combined action of load and environment.The theoretical analysis based on the test data emphasizes distinguishing the changes of concrete components loaded by CFRP from unloaded as well as any other loaded manners.Further analysis is made on the changing regularity of mechanical properties of the components strengthened with CFRP and the corrosion influence on RC beams.The experimental results and theoretical analysis show that increasing the quantity of CFRP and choosing the type of reasonable reinforcement may enhance the reliability indexes and reduce the deflection of concrete beams effectively.