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  

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

作　　者：陈思程 黄海林[1,2] 言兴 朱德举[2] CHEN Sicheng;HUANG Hailin;YAN Xing;ZHU Deju(Hunan Engineering Research Center for Intelligently Prefabricated Passive House,School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province,College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[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

出　　处：《建筑结构》2022年第18期119-127,共9页Building Structure

基　　金：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)。

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

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 

分 类 号：TU746.3􀆰[建筑科学—建筑技术科学]