(1 湖南省智慧建造装配式被动房工程技术研究中心,湖南科技大学土木工程学院,湘潭 411201;2 绿色先进土木工程材料及应用技术湖南省重点实验室,湖南大学土木工程学院,长沙 410082)

摘要: 完成了 24 根 GRC 网格与聚丙烯纤维混凝土复合加固混凝土圆柱试件的轴压性能试验,研究了不同加固层混凝土中聚丙烯纤维含量、GRC 网格包裹位置及包裹方式等参数对试件抗压性能的影响规律,得到了其破坏形态、荷载-应变曲线、荷载-位移曲线及极限荷载.结果表明:试件破坏形态主要为中部压溃和斜剪破坏,大部分试件加固层混凝土最终剥离;GRC 网格全包试件较间隔包裹试件表现出更高的抗压性能;GRC 网格外包在加固层混凝土表面的试件抗压性能优于内包在核心柱混凝土表面的试件;掺入聚丙烯纤维可小幅度增强试件抗压性能;GRC 网格和聚丙烯纤维均能显著提升试件的延性.提出了 GRC 网格与聚丙烯纤维复合加固混凝土圆柱的正截面轴压承载力计算方法,经对比,计算值略小于试验值.

关键词: GRC 网格;聚丙烯纤维混凝土;复合加固;破坏机理;轴压性能;轴压承载力

中图分类号:TU746.3 文献标志码:A 文章编号:1002-848X(2022)18-0119-09

DOI:10.19701 / j.jzjg.20201028

Experimental study on axial compression performance of concrete circular columns reinforced withGRC mesh and polypropylene fiber reinforced concrete

CHEN Sicheng1,HUANG Hailin1,2,YAN Xing1,ZHU Deju2

(1 Hunan Engineering Research Center for Intelligently Prefabricated Passive House,School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;2 Key Laboratory for Green & Advanced CivilEngineering Materials and Application Technology of Hunan Province,College of Civil Engineering,Hunan University,Changsha 410082,China)

Abstract: The axial compression performance tests of 24 concrete circular column specimens reinforced with GRC mesh andpolypropylene fiber reinforced concrete were completed,and the effects of parameters such as the content of polypropylenefiber in different reinforced concrete layers,the location of GRC mesh wrapping and wrapping method on the compressiveperformance of the specimens were studied,and the damage morphology,load-strain curve,load-displacement curve andultimate load were obtained. The results show that: the damage pattern of the specimens is mainly central crush and obliqueshear damage,most of the specimens reinforcement layer concrete eventually peeled. Both GRC mesh and polypropylenefibers can significantly enhance the ductility of the specimens. The calculation method of axial compression load capacity ofpositive section of concrete circular column reinforced with GRC mesh and polypropylene fiber reinforced concrete wasproposed,the calculated value is slightly smaller than the test value by comparison.

Keywords: GRC mesh;polypropylene fiber reinforced concrete;composite reinforcement;failure mechanism;axialcompression performance;axial compression capacity

∗湖南省教育厅优秀青年项目( 19B188),湖南省自然科学基金青年基金项目( 2018JJ3161),湖南省研究生科研创新项目(CX20190802).

第一作者:陈思程,硕士,主要从事基于新材料的既有结构修复与加固研究,Email:634891381@ qq. com.

[引用本文] 陈思程,黄海林,言兴,等. GRC 网格与聚丙烯纤维混凝土复合加固混凝土圆柱轴压性能试验研究[J]. 建筑结构,2022,52(18):119-127. CHEN Sicheng,HUANG Hailin,YAN Xing,et al. Experimental study on axialcompression performance of concrete circular columns reinforced with GRC mesh and polypropylene fiber reinforced concrete[J]. Building Structure,2022,52(18):119-127.