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为探究冻融环境下纤维编织网增强混凝土(TRC)加固钢筋混凝土(RC)柱的轴压性能,本文开展了冻融循环次数、轴压应力和冻融循环耦合作用及短切纤维改性细粒混凝土等因素对TRC加固RC柱性能的研究.试验结果表明:冻融循环次数超过一定次数(20次),会造成TRC表面萌生细微的收缩裂缝,开始降低TRC约束效果,在冻融循环60次时,TRC加固RC柱的承载力降低达21.75%;轴压应力与冻融循环的耦合作用降低TRC加固RC柱的承载力及约束能力相对明显,轴压应力比率为0.4的试件的破坏形态发生改变;在TRC中掺入短切纤维可提高TRC加固柱的抗冻性.此外,掺入AR短切纤维的TRC在冻融环境下有助于提高加固柱的承载力,而掺入PVA短切纤维的TRC有助于增强加固柱的变形性能.
In order to explore the axial compression properties of reinforced concrete (RC) columns reinforced with fiber braided mesh reinforced concrete (TRC) in freezing-thawing environment, the effects of freeze-thaw cycles, coupling of axial compressive stress and freeze-thaw cycles, Granular concrete and other factors on the performance of RC columns strengthened with TRC.The results showed that the number of freeze-thaw cycles more than a certain number of times (20 times) will cause tiny cracks on the surface of TRC and start to reduce the restraint effect of TRC. On the other hand, the carrying capacity of TRC reinforced RC columns decreased by 21.75%. Coupling effect of axial compressive stress with freeze-thaw cycles decreased the bearing capacity and restraining capacity of TRC strengthened RC columns obviously. The failure of specimens with axial compressive stress ratio of 0.4 Morphology changes; incorporation of chopped fibers in TRC can improve the freeze-thaw resistance of TRC columns.In addition, TRC incorporation of AR chopped fibers in the freeze-thaw environment helps to enhance the bearing capacity of the reinforced column, The TRC of PVA chopped fibers helps to enhance the deformability of the reinforced column.