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(1 湖南省智慧建造裝配式被動(dòng)房工程技術(shù)研究中心,湖南科技大學(xué)土木工程學(xué)院,湘潭 411201;2 綠色先進(jìn)土木工程材料及應(yīng)用技術(shù)湖南省重點(diǎn)實(shí)驗(yàn)室,湖南大學(xué)土木工程學(xué)院,長(zhǎng)沙 410082)

摘要: 完成了 24 根 GRC 網(wǎng)格與聚丙烯纖維混凝土復(fù)合加固混凝土圓柱試件的軸壓性能試驗(yàn),研究了不同加固層混凝土中聚丙烯纖維含量、GRC 網(wǎng)格包裹位置及包裹方式等參數(shù)對(duì)試件抗壓性能的影響規(guī)律,得到了其破壞形態(tài)、荷載-應(yīng)變曲線、荷載-位移曲線及極限荷載.結(jié)果表明:試件破壞形態(tài)主要為中部壓潰和斜剪破壞,大部分試件加固層混凝土最終剝離;GRC 網(wǎng)格全包試件較間隔包裹試件表現(xiàn)出更高的抗壓性能;GRC 網(wǎng)格外包在加固層混凝土表面的試件抗壓性能優(yōu)于內(nèi)包在核心柱混凝土表面的試件;摻入聚丙烯纖維可小幅度增強(qiáng)試件抗壓性能;GRC 網(wǎng)格和聚丙烯纖維均能顯著提升試件的延性.提出了 GRC 網(wǎng)格與聚丙烯纖維復(fù)合加固混凝土圓柱的正截面軸壓承載力計(jì)算方法,經(jīng)對(duì)比,計(jì)算值略小于試驗(yàn)值.

關(guān)鍵詞: GRC 網(wǎng)格;聚丙烯纖維混凝土;復(fù)合加固;破壞機(jī)理;軸壓性能;軸壓承載力

中圖分類號(hào):TU746.3 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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

∗湖南省教育廳優(yōu)秀青年項(xiàng)目( 19B188),湖南省自然科學(xué)基金青年基金項(xiàng)目( 2018JJ3161),湖南省研究生科研創(chuàng)新項(xiàng)目(CX20190802).

第一作者:陳思程,碩士,主要從事基于新材料的既有結(jié)構(gòu)修復(fù)與加固研究,Email:634891381@ qq. com.

[引用本文] 陳思程,黃海林,言興,等. GRC 網(wǎng)格與聚丙烯纖維混凝土復(fù)合加固混凝土圓柱軸壓性能試驗(yàn)研究[J]. 建筑結(jié)構(gòu),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.