高延性聚酯纤维加固RC柱的抗震性能研究

The Study on Seismic Behavior of RC Columns Reinforced with High Ductile Polyester Fiber

为研究高延性聚酯纤维和增加柱脚配筋两种加固方法对RC柱的抗震性能的影响,进行了3组7根RC加固柱的水平低周反复荷载试验,分析试件的破坏特征、荷载-位移滞回曲线、骨架曲线及耗能。结果表明,采用高延性聚酯纤维加固的方法能够约束混凝土的横向变形,充分发挥钢筋的性能,对提高试件的延性和耗能效果显著。2层纤维带加固效果优于1层纤维带;但和增加配筋的加固方法一样,对提高试件的承载力效果一般。采用高延性聚酯纤维和增加配筋及其长度的综合加固方法,既能够有效地增加试件的承载力,而且显著地增大试件的延性和耗能,提高试件的抗震性能。

The seismic performance of RC column was studied which reinforced by the high ductile polyester fiber and increasing reinforcement ratio in the pedestal,through using the horizontal low reversed cyclic loading test,which is analyze the failure characteristics,loading-displacement hysteretic curve,skeleton curve and energy consumption of 7 RC columns that were divided into 3 groups. It was found that the high ductile polyester fiber reinforcement that taken full advantage of the steel bar could restrain transverse deformation of concrete and improve obviously the ductility and energy consumption of the test specimens. The result appears that the more layer of fibre tape can have the better effection. However,the same as improving reinforcement ratio in pedestal,it is unable to increase loading capacity of the RC columns. The comprehensive reinforcement method with high ductile polyester fiber and improving reinforcement ratio in pedestal,remarkably increases not only the loading capacity but also the ductility and energy consumption of the test specimens.