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为进一步探究纤维编织网增强混凝土(TRC)修复加固钢筋混凝土柱在氯盐侵蚀环境下的受压性能,对12根TRC加固钢筋混凝土柱进行轴心受压性能试验研究,分析了不同干湿循环次数(0,60,90和120)、不同持续荷载比(0,0.1,0.2和0.4)、氯盐干湿循环与持续荷载耦合作用以及短切纤维改性高性能混凝土对TRC加固效果的影响。研究结果表明:干湿循环作用后TRC加固柱的极限承载力及变形性能有下降趋势,在干湿循环作用次数达到120次后,TRC加固柱的极限承载力降低6.71%;相比于单一的干湿循环作用,在氯盐干湿循环与持续荷载耦合作用下,TRC加固柱的变形和承载力下降更多;在干湿循环(90次)不变时,持续荷载比的增加会降低TRC的加固效果;干湿循环与持续荷载耦合作用的增加会改变TRC加固柱的破坏形态;使用短切PVA纤维改性高性能混凝土作为TRC基体加固钢筋混凝土柱会使其耐久性能稍有提高;给出了氯盐干湿循环作用下TRC加固RC柱的轴心受压极限承载力简化计算公式,计算值与试验值吻合较好。
In order to further investigate the compression performance of reinforced concrete columns reinforced with fiber reinforced plastic (TRC) reinforced concrete columns under chloride salt erosion conditions, the axial compressive properties of 12 TRC reinforced concrete columns were studied, and the effects of different wet and dry cycles (0, 60, 90 and 120), different continuous load ratios (0, 0.1, 0.2 and 0.4), the coupling effect of chloride wet and dry cycles with sustained load and the effect of chopped fiber modified high performance concrete on the reinforcement effect of TRC . The results show that the ultimate bearing capacity and the deformability of the TRC reinforced column decrease after the wet-dry cycle. After the number of wet-dry cycles reaches 120 times, the ultimate bearing capacity of the TRC reinforced column decreases by 6.71% Under the wet-dry cycle, the deformation and the bearing capacity of the TRC reinforced column decreased more under the coupling of the chloride wet-dry cycle and the continuous load. When the dry-wet cycle (90 times) was constant, the increase of the continuous load ratio would reduce the TRC The combination of dry-wet cycle and continuous load will change the failure mode of TRC reinforced columns. The use of short-cut PVA fiber modified high performance concrete to reinforce reinforced concrete columns as TRC will slightly improve the durability. A simplified formula for calculating the ultimate bearing capacity of RC strengthened RC columns under the action of chloride salt wet-dry cycle is presented. The calculated values are in good agreement with the experimental values.