纤维增强聚合物基复合材料加固锈蚀钢筋混凝土圆柱轴心受压性能

为了给纤维增强聚合物基复合材料（FRP）加固腐蚀环境下钢筋混凝土圆柱的设计和施工提供参考，促进FRP加固钢筋混凝土圆柱的应用，本文通过加速腐蚀得到类似实际环境中已锈损钢筋混凝土圆柱，采用碳纤维增强聚合物基复合材料（CFRP）条带和玻璃纤维增强聚合物基复合材料（GFRP）条带分别对锈蚀钢筋混凝土圆柱进行加固，最后对加固后圆柱进行轴心受压试验，重点研究钢筋锈蚀率、FRP层数和种类对钢筋混凝土圆柱受压承载力的影响；基于对FRP条带间隔约束效应、钢筋锈蚀对混凝土截面及钢筋力学性能影响的研究与分析，提出FRP条带间隔约束锈蚀钢筋混凝土圆柱轴心受压承载力计算模型。试验实测值与模型计算值之比的平均值为1.020，变异系数为0.063，二者符合较好。

Axial compressive behavior of corroded reinforced concrete columns strengthened by fiber reinforced polymer composite

In order to provide reference for the design and construction of reinforced concrete columns strengthened with fiber reinforced polymer composite(FRP) under corrosive environment, and to promote its application, the accelerated corrosion was conducted to get the damaged reinforced concrete column which was similar to the action of actual environment. Then, the carbon fiber reinforced polymer composite(CFRP) strips and glass fiber reinforced polymer composite (GFRP) strips were used to strengthen the corroded reinforced concrete columns respectively. Finally, the axial compression tests were carried out on the corroded reinforced concrete columns strengthened with FRP to investigate the effect of rebar corrosion rate, FRP layers and types on the compressive bearing capacity of columns. Based on the research and analysis of the action effect of FRP with interval constraints, rebar corrosion on concrete section and mechanical properties of corroded reinforcement, the calculation model of the axial compressive bearing capacity of corroded reinforced concrete columns strengthened with FRP was presented. The average value of the ratios of measured compressive bearing capacity to calculated by the model is 1.020, and the coefficient of variation is 0.063, which indicates that the calculation model is in good agreement with the test reslts.