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进行了1根未受火混凝土短柱、1根火灾后混凝土短柱、1根CFRP加固未受火混凝土短柱和3根CFRP加固火灾后混凝土短柱的拟静力试验,考察了CFRP的加固量和加固方式对火灾后混凝土短柱抗震加固效果的影响情况,建议了CFRP加固火灾后混凝土柱抗剪承载力的实用计算方法。研究结果表明:外包CFRP加固可将未受火混凝土短柱的抗剪承载力提高21.8%、可将火灾后混凝土短柱的抗剪承载力提升至未受火试件的111.2%~117.1%、可提高受火前后短柱的极限变形能力和累积滞回耗能。与未受火试件相比,外包CFRP不会提高火灾后加固混凝土短柱的割线刚度。对于相同的加固量,全包CFRP柱的抗剪承载力略优于条带包裹柱。受火前、后和外包CFRP加固前、后混凝土短柱的滞回规则均类似。
A quasi-static test of uncoiled concrete short column, a post-fire concrete short column, a CFRP reinforced concrete short column and three CFRP short columns were carried out to investigate the reinforcement of CFRP Volume and reinforcement methods on the post-fire concrete short columns aseismatic reinforcement effect of the situation, proposed CFRP reinforced concrete column shear capacity of the practical calculation method. The results show that the CFRP reinforcement can increase the shear strength of un-fired concrete short columns by 21.8%, and increase the shear strength of post-fire concrete short columns to 111.2% -117.1% It can improve the deformation limit and cumulative hysteresis energy before and after the fire. Compared with the un-fired specimens, CFRP outsourcing does not increase the secant stiffness of concrete columns after fire. For the same amount of reinforcement, the shear strength of all-package CFRP columns is slightly better than that of strip-wrapped columns. Before and after the fire and outsourcing CFRP reinforcement before and after the short-term concrete hysteresis rules are similar.