氯盐环境下TRC加固对RC柱偏压性能影响  

Effect on Eccentric RC Columns of TRC Strengthening in Chloride Environment

作　　者：李耀[1,2] 尹世平 胡翔骞[2] LI Yao;YIN Shiping;HU Xiangqian(State Key Laboratory for Geomechanics&Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,School of Mechanics&Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]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,江苏徐州221116

出　　处：《应用基础与工程科学学报》2021年第4期915-926,共12页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(51478458);江苏省研究生科研与实践创新计划项目(KYCX212273);中国矿业大学研究生创新计划项目(2021WLKXJ028)。

摘　　要：由于承载能力高、限裂效果好、具有良好的耐腐蚀性,纤维编织网增强混凝土(textile reinforced concrete, TRC)作为FRP(fiber reinforced polymer)的一种替代材料,引起了国内外学者的广泛关注并对其力学性能开展了一系列研究.但是,目前关于氯盐环境下TRC加固对偏心钢筋混凝土(reinforced concrete, RC)柱力学性能的影响规律尚不明确.为此,设计制作了9根RC柱并进行氯盐干湿循环试验,其中8根RC柱采用了TRC加固.氯盐干湿循环试验结束后,通过偏心受压试验,探究了不同加固方式和加固层数对TRC加固偏心RC柱力学性能的影响规律.试验结果表明:在氯盐干湿循环下,随着加固层数的增加,纵向单面加固偏压柱的极限承载力呈现出增加趋势,而延性却呈现下降趋势;对于全包加固柱来说,偏压柱的极限承载力和侧向变形能力均随加固层数的增加而增大.此外,考虑氯离子侵蚀的影响,提出了侵蚀环境下TRC加固偏压RC柱的承载力计算公式.Textile-reinforced concrete(TRC),as an alternative for fiber reinforced polymer(FRP),has attracted wide attention due to its advantages such as high bearing capacity, good crack limiting effect, and good corrosion resistance.A series of studies have been carried out on the mechanical properties of TRC-strengthened RC columns.However, the influence of TRC strengthening on the mechanical properties of eccentric reinforced concrete(RC) columns under chloride environment is not clear at present.Nine RC columns were designed and manufactured, and then, the chloride salt dry-wet cycle test was performed.Among them, eight RC columns were strengthened with TRC.When the chloride dry-wet cycle test was completed, the effects of different strengthening methods and layers on the mechanical properties of TRC-strengthened RC columns were explored through eccentric compression tests.The results show that with the increase of TRC layers, the ultimate bearing capacity of eccentric compression columns longitudinally unilateral strengthened by TRC increases under the chloride dry-wet cycle, whereas the ductility decreases.For fully enclosed columns, the ultimate bearing capacity and lateral deformation capacity increase with the increase of TRC layers.In addition, considering the influence of chloride ion erosion, a formula for calculating the bearing capacity of RC columns strengthened by TRC under eccentric compression was proposed.

关 键 词：纤维编织网增强混凝土 偏压RC柱 氯盐干湿循环 加固方式 加固层数 扫描电子显微镜 承载力计算 

分 类 号：TU375.4[建筑科学—结构工程]