碳、玻璃层内混杂纤维布加固梁抗弯性能研究

FLEXURAL PERFORMANCE OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH CARBON/GLASS INTRAPLY HYBRID FIBER SHEETS

通过对8根钢筋混凝土梁的抗弯试验，研究了不同比例及层数的碳、玻璃层内混杂纤维布对加固梁抗弯性能的影响。研究发现当纤维布层数相同时，碳、玻璃层内混杂纤维布加固梁的极限承载力比单一碳纤维布加固梁降低了5．5％-18．7％，位移延性系数提高了18．6％-45．2％，能量延性系数提高了22．5％-45．1％。试验结果表明碳、玻璃层内混杂纤维布加固梁的延性明显优于单一碳纤维布加固梁。在试验研究的基础上，采用弹塑性截面分析法计算了混杂纤维布加固梁的承载力，理论计算值与试验值吻合良好。

In this paper the effects of different proportions and layers of carbon/glass intraply hybrid fiber sheets on the flexural behavior of beams strengthened with hybrid fiber sheets were investigated. It has been found that maximum load of RC beams strengthened with carbon/glass intraply hybrid fiber sheets are 5.5%- 18.7% less than that of the RC beam strengthened with single carbon fiber sheets, while the displacement ductility index increases 18.6% -45.2% and the energy ductility index increases 22.5%-45.1%, when strengthened with the same total layers of fiber sheets. The results confirmed that the ductility of the carbon/ glass hybrid fiber sheets were better significantly than that of single carbon fiber sheets. Based on the experimental research, an elastoplastic section analysis method is conducted to predict the bearing capacity of RC beams strengthened with hybrid fiber sheets, the results from the theoretical predictions and the experiment agree well.