为研究外包型钢加固后箍筋锈蚀混凝土柱的恢复力模型，首先对9根不同箍筋锈蚀率、体积配箍率的各混凝土柱进行通电锈蚀，锈蚀完成后加固，进而进行低周往复荷载试验。其次对各试验试件的骨架曲线及滞回曲线进行分析。在完好试件恢复力模型特征参数计算的基础上，对数据进行拟合回归，最后给出了外包型钢加固后箍筋锈蚀混凝土柱的退化三线型恢复力模型，并提出了不同因素作用下特征参数的计算公式。结果表明：箍筋锈蚀柱经外包型钢加固后各抗震性能指标有显著提升，破坏特征点明显滞后于完好试件，且以剪切破坏为主。通过对比分析，所得模型与试验结果吻合较好，能很好地反映外包型钢加固柱的滞回特性，为此类柱恢复力模型的计算提供参考。
Abstract
In order to study the restoring force model of concrete columns corroded by stirrups after conglutinated steel reinforcement, nine concrete columns with different stirrup corrosion rates and volumetric stirrup ratios were subjected to electrified corrosion, reinforcement after completion of corrosion, and then the low-cycle reciprocating load test was carried out. Secondly, the skeleton curve and hysteresis curve of each test specimen were analyzed. On the basis of calculating the characteristic parameters of the restoring force model of the intact specimen, the data were fitted and regressed. Finally, degenerate trilinear restoring force model of stirrup corroded concrete column after conglutinated steel reinforcement was given, and the calculation formula of characteristic parameters under different factors was proposed. The results show that the seismic performance indexes of corroded stirrup columns strengthened by conglutinated steel are significantly improved, and the failure characteristic points are obviously lagging behind the intact specimens, and the shear failure is the main failure mode. Through the comparative analysis, the obtained model is in good agreement with the experimental results, which can well reflect the hysteretic characteristics of the conglutinated steel reinforced column and provide reference for the calculation of the restoring force model of such column.
关键词
外包型钢加固 /
箍筋锈蚀 /
恢复力模型 /
低周往复荷载试验
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Key words
conglutinated steel reinforcement /
corroded stirrups /
restoring force model /
low cyclic loading test
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