混杂FRP复合材料性能及其加固腐蚀RC梁弯曲性能研究

摘要

在混杂FRP(Fiber Reinforced Polymer)复合材料单轴拉伸性能研究的基础上,通过对四根腐蚀混凝土梁的弯曲试验,研究了碳/芳纶/玻璃三种纤维层间混杂布对腐蚀混凝土梁弯曲性能的影响.结果表明:(1)混杂FRP复合材料均表现出良好的混杂效应,但碳/芳纶/玻璃三种纤维的混杂效应最优,其混杂效应系数达到0.453.(2)碳/芳纶/玻璃层间混杂纤维布加固腐蚀梁的开裂、屈服、峰值、极限荷载相比未加固腐蚀梁分别提高了14％、60％、98％和91％,而位移延性系数仅降低11％,表明混杂纤维布可显著改善腐蚀混凝土梁的弯曲性能,这将为混杂FRP复合材料加固腐蚀混凝土结构性能评估与加固设计提供参考.%Based on the uniaxial tensile properties of hybrid FRP composites, The effects of CFRP (Carbon FRP)/AFRP (Aramid FRP)/GFRP (Glass FRP) laminated hybrid fiber sheets on the flexural performance of corroded RC beam was investigated by ihe flexural experiments of four corroded RC beams, results show that (1) the hybrid FRP composites occurs good hybrid effect, and hybrid effect of CFRP/AFRP/GFRP laminated hybrid composites is optimum, its hybrid effect coefficients is 0.453. (2) compared with the un - strengthened corroded RC beam, the cracking load, yield load, maximum load and ultimate load of corroded RC beam strengthened with CFRP/AFRP/GFRP hybrid sheets is respectively increased by 14% , 60% , 98% and 91% , but the displacement ductility index is only decreased by 11 % , which indicates that the hybrid FRP sheets can improve significantly the flexural performance of corroded RC beam. The reference of the evaluating and design of corroded RC structures strengthened with hybrid FRP composites is provided.