CFRP与BFRP加固RC柱抗震性能比较研究

采用有限元软件ABAQUS建立CFRP与BFRP加固RC柱的数值模型,比较研究了两种FRP材料加固RC柱的抗震性能,并系统地讨论了FRP材料类型、长细比、轴压比、FRP加固层数等参数对RC柱抗震性能的影响。研究结果表明,模型可以较好地模拟FRP加固钢筋混凝土圆柱的抗震性能,与试验结果吻合。随着FRP包裹层数增加,试件的承载力逐渐提高,但存在最佳加固层数;随着轴压比的增加,试件承载力有一定提高,但延性降低。在长细比一定范围内,试件的承载力及延性得到较大提高。相同工况下,两种FRP加固RC柱在承载力、延性、耗能能力方面相近,但考虑到价格优势及较好的力学性能,BFRP在混凝土结构抗震加固领域有较好的应用前景。

Comparative Study on the Seismic Performance of Reinforced Concrete Columns Strengthened with CFRP and BFRP

The numerical model of CFRP and BFRP-reinforced RC columns was established by finite element software ABAQUS. The seismic behavior of two kinds of FRP-reinforced RC columns was studied. The FRP material type,slenderness ratio, axial compression ratio and FRP reinforcement layer on the seismic performance of the RC column were systematically analyzed. The results show that the model can better simulate the seismic performance of FRP-reinforced reinforced concrete columns, which is in good agreement with the experimental results. With the increase of the number of FRP wraps, the bearing capacity of the test piece is gradually increased, but the optimal number of layers is present. With the increase of the axial compression ratio, the bearing capacity of the test piece is improved, but the ductility is reduced.In a certain range of slenderness ratio, the bearing capacity and ductility of the test piece are greatly improved. Under the same working conditions, the two FRP-reinforced RC columns are similar in bearing capacity, ductility and energy consumption. However, considering the price advantage and good mechanical properties, BFRP has a good application prospect in the field of seismic strengthening of concrete structures.