BFRP加固高轴压比低强混凝土圆柱抗震性能研究

Seismic Performance of BFRP-Reinforced Low-Strength Concrete Circular Columns with High Axial Compression Ratio

为研究纤维增强复合材料(FRP)加固高轴压比低强混凝土配筋圆柱的抗震性能,对6根加固柱和3根对比柱进行了低周反复侧向加载试验.结果表明:加固柱的破坏为弯曲破坏,构件的承载力、延性和耗能能力显著改善,对高轴压比低强混凝土柱的加固效果最好;在相同侧向约束应力下,玄武岩纤维布和碳纤维布加固柱承载力相近,但玄武岩纤维布加固柱延性和耗能能力更高.基于试验数据进行回归分析,提出了更广泛轴压比和混凝土强度范围下加固圆柱的峰值荷载和位移延性系数计算式.

To investigate the seismic behavior of fiber reinforced plastic(FRP)confined circular reinforced concrete columns with high axial compression ratio and low-strength concrete,six confined columns and three control columns were tested under low cyclic lateral load.The results show that after confinement,the failure modes of columns change into flexural failure.The strength,ductility and energy dissipation capacity of columns are improved significantly,and the FRP can provide good confinement especially for columns with high axial compression ratio and low-strength concrete.With the same lateral confining stress,the peak load of basalt FRP(BFRP)and carbon FRP(CFRP)confined columns are similar,but the former has better ductility and energy dissipation capacity.Based on the test results,modified equations of peak load and displacement ductility factor are proposed.