【摘要】 为了研究碳纤维增强复合材料(CFRP)加固高强混凝土方柱的抗震性能,对13个高强混凝土方柱进行低周反复荷载试验,研究了试件破坏形态、滞回特性、骨架曲线、耗能能力和延性等抗震性能,探讨了轴压比、剪跨比、CFRP加固量对高强混凝土方柱延性性能的影响,给出了计算CFRP布有效约束系数和位移延性系数的公式。结果表明:随着轴压比增大、剪跨比减小,试件耗能能力和延性降低;横向包裹CFRP布可以显著改善高强混凝土方柱耗能能力和延性;与未加固试件相比,横向包裹CFRP布对轴压比较大或剪跨比较小试件的延性提高效果更为显著;随着加固量的增加,试件的耗能能力和延性增大,但增加幅度逐渐降低。更多还原

【Abstract】 To investigate the seismic behaviors of high-strength reinforced concrete(RC) square columns strengthened with carbon fiber reinforced polymer(CFRP),the low cyclic loading test of thirteen high-strength RC square columns was conducted.The seismic behaviors of columns,such as failure patterns,hysteresis behaviors,skeleton curves,energy dissipation capacity and ductility were studied,and the influences of axial load ratio,shear span ratio and CFRP strengthening volume on the ductility of high-strength RC square columns were discussed.The calculation formulae of CFRP effective constraint coefficient and displacement ductility coefficient were proposed.Results show that the ductility and energy dissipation capacity can be significantly reduced as the increase of axial load ratios or the decrease of shear span ratios;CFRP can observably improve the ductility and energy dissipation capacity of high-strength RC square columns;compared with the columns without CFRP,the seismic behaviors of columns with high axial load ratio or low shear span ratio are improved more obviously after being strengthened with CFRP in transverse;and the ductility,energy dissipation capacity increase with the increases of strengthening volume,but the improvement extent reduces gradually.更多还原