预应力CFRP加固混凝土圆柱抗震性能分析

Studies on Seismic Performance of Concrete Cylinder Strengthened with Prestressed CFRP

为研究混凝土圆柱在预应力CFRP加固下的抗震性能,对4个试件进行了水平低周往复荷载试验,分析试件在破坏形态、位移延性、耗能能力等方面的差异,并使用Abaqus进行了不同CFRP高度和不同层数加固的数值模拟。试验结果表明,采用预应力CFRP对现浇混凝土圆柱进行加固,可较好地改善试件的耗能能力和位移延性。模拟结果表明,在不同CFRP加固层数下的现浇柱,其承载力和位移延性有所提升,试件初期的刚度也相应上升;试件的延性随着加固高度的增加而增加,但是随着加固高度的增加,提升的效果也逐渐减弱。

In order to study the seismic performance of concrete columns strengthened with prestressed CFRP,four specimens were tested under horizontal low cyclic loading.The differences in failure mode,displacement ductility and energy dissipation capacity of the specimens were analyzed.Numerical simulations of different reinforcement heights and layers were carried out using Abaqus.The test results show that the energy dissipation capacity and displacement ductility of the specimens can be improved by using prestressed CFRP to reinforce the cast-in-place concrete columns.The simulation results show that the bearing capacity and displacement ductility of the cast-in-place column under different CFRP reinforcement layers are improved,and the initial stiffness of the specimen is also increased accordingly.The ductility of the specimen increases with the increase of the reinforcement height,but with the increase of the reinforcement height,the improvement effect is gradually weakened.