GFRP管约束UHPC柱的伪静力试验

Pseudostatic Experimental Study of GFRP Tube Constraining UHPC Column

针对特定环境需求下柱的抗震与耐腐蚀能力,提出一种玻璃纤维增强复合材料与超高性能混凝土组合柱;考虑不同轴压比和GFRP (Glass Fiber Reinforced Plastics,玻璃纤维增强塑料)管纤维丝缠绕角度参数,对6个组合柱试件和1个超高性能混凝土(UHPC)对比柱试件开展了水平低周往复加载试验;对试件的滞回曲线、延性系数、强度和刚度退化系数、应变变化规律以及耗能能力进行了研究.研究结果表明:GFRP管能够改善试件破坏形态,提高试件抗震性能;当轴压比一定时,45°缠绕管组合柱的极限水平承载力和等效刚度比80°缠绕管组合柱低,但其延性系数更高,耗能能力更好,GFRP管对混凝土的约束作用也更强;在试验轴压比为0.2,0.3,0.4,轴压比越大,试件的极限水平承载力越低,延性越差,耗能能力下降.

In this paper,the seismic and corrosion resistance of the lower column is tailored to specific environmental requirements.A glass fiber reinforced composite material and ultra-high performance concrete composite column are proposed.Considering different axial pressure ratios and GFRP(Glass Fiber Reinforced Plastics)pipe fiber winding angle parameters,the horizontal low-week reciprocating loading test is carried out on 6 combination column specimens and 1 UHPC comparison column specimen.The hysteresis curve,ductility coefficient,strength and stiffness degradation coefficient,strain change law and energy consumption capacity of the specimen are studied.The findings suggest that GFRP tube can improve the failure form of the specimen and improve the seismic performance of the specimen.When the axial pressure ratio is fixed,the ultimate horizontal bearing capacity and equivalent stiffness of the 45°winding tube combination column are lower than those of the 80°winding pipe combination column,but its ductility coefficient is higher,the energy consumption ability is better,and the constraint effect of the GFRP pipe on the concrete is also stronger.In the test axial compression ratio of 0.2,0.3,0.4,the larger the axial compression ratio,the lower the ultimate horizontal bearing capacity of the specimen,the poorer the ductility and the lower the energy dissipation capacity.