硫酸盐溶液干湿循环对FRP加固混凝土梁抗剪性能的劣化作用

为了研究和分析CFRP加固混凝土梁在沿海恶劣条件下的耐久性问题,进行了人工模拟硫酸钠溶液干湿循环试验,重点研究了硫酸盐溶液干湿循环因素对CFRP加固混凝土梁抗剪性能的劣化影响.研究结果表明:硫酸盐溶液干湿循环对加固梁极限荷载有明显影响,极限承载力有明显下降,对FRP的有效应变也有较大影响,但没有改变应变的分布规律.

Effect of Sulfate Solution Dry-Wet Cycling Environment on Shear Behavior of Concrete Beam Externally Bonded FRP

To investigate the mechanical performances of the concrete beams externally bonded fiber reinforced polymer( FRP) under severe environmental conditions,seven shear-strengthened beams with CFRP were designed and studies in the artificial accelerating test of sulfate solution dry-wet cycling degradation. Experimental results show that sulfate solution dry-wet cycling degradation affects significantly the shear behavior of shear-strengthened beams. The shear capacity of specimen decreases obviously with the time of the artificial ageing test and the FRP effective strain reduces rapidly. However,the strain distribution of FRP along the beam's longitudinal axis seems not to be influenced by the sulfate /dry-wet cycling corrosion.