预应力CFRP/GFRP纤维加固梁的延性性能研究

摘要

碳纤维具有高强度、高弹性模量和延性较差的特点,玻璃纤维相对于碳纤维可起到互补作用,采用预应力碳纤维/玻璃纤维(CFRP/GFRP)加固混凝土梁是一项新的加固技术.基于分层单元理论,建立了加固混凝土梁的计算模型,分析了加固后混凝土梁在荷载作用下三分点加载全过程数据,对比分析了加固梁的屈服荷载、极限荷载、变形和延性性能开展情况,研究了不同混杂纤维配比等对加固梁延性性能的影响.结果表明,将CFRP与GFRP混杂后能充分发挥各自的优势,且能提高预应力纤维加固梁的特征荷载.%Carbon fiber has high tensile strength and modulus of elasticity,but the ductility of the carbon fiber is poor. Relative to the carbon fibers,glass fiber plays a complementary role.It is a new reinforcement technique to reinforce con-crete beams by prestressed CFRP/GFRP.Based on the theory of hierarchical units,a calculation model of reinforced con-crete beam is established for the prestressed strengthened beams in CFRP/GFRP.The overall dates of the concrete beam under loads at three dividing point are analyzed.The comparative analysis of yield load,ultimate load,deformation and duc-tility performance has been worked out and the influence of ductility performance of reinforced beam has been researched in many factors such as the different ratio of hybrid fiber.The results show that when CFRP and GFRP are mixed,the proper-ty and the characteristic loads can both be improved.