为探究碳纤维增强复合材料(carbon fiber reinforced composites,CFRP)布加固对锈蚀钢筋混凝土（reinforced concrete，RC）矩形柱抗震性能的影响，设计并制作了7根RC矩形柱试件，其中6根采用贴面外加电流法进行加速锈蚀。锈蚀完成后，对3根锈蚀柱进行CFRP布加固。通过拟静力试验，分析得到了各试件的破坏形态、滞回曲线、骨架曲线、位移延性、刚度退化曲线、累计耗能曲线、等效粘滞阻尼系数、曲率分布、位移组成及有效刚度。结果表明，钢筋锈蚀显著降低了试件的抗震性能，当锈蚀率达到15.09%时，试件的峰值荷载、位移延性系数和耗能能力分别降低了37.5%、14.2%和32.8%。而CFRP布加固能有效提高锈蚀试件的抗震性能，与未加固锈蚀试件C1、C2和C3相比，加固后的试件C1R、C2R和C3R的峰值荷载分别提高11.57%、4.97%和13.32%，延性系数分别提高7.0%、7.2%和12.2%，总累计耗能分别提高112.10%、91.35%和166.12%。随着锈蚀率的增加，试件的有效刚度呈现逐渐下降的趋势。为此，提出了一个适用于预测锈蚀RC矩形柱有效刚度的公式，其计算结果贴合试验值，具有较高的精度和较小的离散性。
Abstract
To investigate the impact of CFRP sheet strengthening on the seismic performance of corroded reinforced concrete (RC) rectangular columns, seven RC rectangular column specimens were designed and fabricated. Six specimens underwent accelerated corrosion using an external-current-surface coating method. Following the corro-sion process, three of the corroded columns were strengthened with CFRP sheets. Quasi-static tests were conducted on all seven specimens to analyze their failure modes, hysteresis curves, skeleton curves, displacement ductility, stiffness degradation curves, cumulative energy dissipation curves, equivalent viscous damping ratios, curvature distribution, displacement composition, and effective stiffness. The results demonstrate that rebar corrosion signifi-cantly diminishes the seismic performance of the specimens. At a corrosion rate of 15.09%, the peak load, displace-ment ductility ratio, and energy dissipation capacity of the specimens decreased by 37.5%, 14.2%, and 32.8%, re-spectively. Conversely, CFRP sheet strengthening effectively enhances the seismic performance of corroded speci-mens. Compared to the unstrengthened corroded specimens C1, C2, and C3, the CFRP-strengthened specimens. C1R, C2R, and C3R exhibited increases in peak load of 11.57%, 4.97%, and 13.32%, improvements in ductility ratio of 7.0%, 7.2%, and 12.2%, and enhancements in total cumulative energy dissipation of 112.10%, 91.35%, and 166.12%, respectively. As the corrosion rate increases, the effective stiffness of the specimen gradually decreases. To address this behavior, a predictive formula for estimating the effective stiffness of corroded RC rectangular columns is proposed. The formula demonstrates high accuracy and low dispersion when fitted to the experimental data.
关键词
CFRP布 /
锈蚀 /
钢筋混凝土矩形柱 /
抗震性能 /
拟静力试验 /
有效刚度
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Key words
CFRP sheet /
Corrosion /
Reinforced concrete rectangular column /
Seismic performance /
Quasi-static test /
Effective stiffness
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