冻融环境下TRC加固RC柱轴压性能的研究

发布时间：2018-01-06 20:14

本文关键词：冻融环境下TRC加固RC柱轴压性能的研究　出处：《应用基础与工程科学学报》2017年03期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:In order to investigate the axial compression behavior of reinforced concrete reinforced concrete (TRC) columns strengthened by fiber braided mesh under freeze-thaw environment, the freeze-thaw cycles were carried out in this paper. The effect of axial compression stress, freeze-thaw cycle coupling and short shearing fiber modified fine grained concrete on the properties of RC columns strengthened with TRC is studied. The experimental results show that the freeze-thaw cycles are more than 20 times. It will cause slight shrinkage cracks on the surface of TRC and reduce the confinement effect of TRC. The bearing capacity of RC columns strengthened by TRC is reduced to 21.75 when the freeze-thaw cycles are 60 times. The coupling effect of axial compression stress and freeze-thaw cycle reduces the bearing capacity and restraint ability of RC columns strengthened by TRC, and the failure pattern of specimens with axial compression stress ratio of 0.4 is changed. Adding short cut fiber into TRC can improve the freezing resistance of TRC strengthened column. In addition, TRC with AR short cut fiber can improve the bearing capacity of strengthened column in freeze-thaw environment. And the TRC with PVA staple fiber is helpful to strengthen the deformation property of the strengthened column.
【作者单位】：中国矿业大学深部岩土力学与地下工程国家重点实验室;中国矿业大学力学与土木工程学院江苏省土木工程环境灾变与结构可靠性重点实验室;
【基金】：国家自然科学基金项目(51478458) 中国博士后基金特别资助项目(2014T70559)
【分类号】：TU375.3
【正文快照】： 在冬季,北方地区施撒除冰盐的混凝土路面或沿海桥梁、建筑物等,遭受冻融循环与氯盐侵蚀的协同作用,使得结构受到严重的破坏,受损建筑物亟需加固修复[1-2].纤维编织网增强混凝土(textile reinforced concrete,TRC)是一种由纤维编织网和细粒混凝土结合而成的复合材料[3].采用TRC

【参考文献】