玻璃纤维管约束再生混凝土柱轴压性能研究
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摘要
为研究玻璃纤维管约束再生混凝土柱轴心受压性能,设计了13个试件并对其进行轴心受压试验,观察并研究了试件在轴压作用下的破坏形态及破坏过程,获取了试件的荷载-应变曲线、荷载-位移曲线、承载力等轴压性能指标,主要分析再生骨料取代率、长细比、再生混凝土强度等级等参数对玻璃纤维管约束再生混凝土柱轴压性能的影响。结果表明:玻璃纤维管可以有效地提高构件轴压承载力,其中玻璃纤维管沿着环向和纵向方向发生不同程度的断裂而破坏,内部核心再生混凝土主要表现为压溃和剪切破坏;试件承载力随长细比和再生骨料取代率的增大而降低,最大降幅分别为13.72%和11.08%;试件轴压承载力随着再生混凝土强度的增加而增大,最大增幅为7.59%。在此基础上,考虑再生骨料取代率和长细比对试件轴压承载力的不利影响,提出适用于玻璃纤维管约束再生混凝土柱的轴压承载力计算公式,计算值与试验值吻合较好。研究结论可为该构件的工程应用提供一定参考。
In order to study the mechanical properties of recycled concrete under axial compression of glass fiber tube constrained components, 13 specimens were designed for axial compression tests, the whole failure process of compression specimens and failure modes were observed, the curves of load-displacement of glass fiber tube confined recycled concrete columns were obtained, the influences of the replacement ratio of recycled coarse aggregate, the strength of recycled coarse concrete and the slenderness ratio on the axial compression performance of restrained recycled concrete columns with glass fiber tube are analyzed. The test results show that the glass fiber tube may effectively improve the component's axial compressive capacity, and the glass fiber tube breaks to different extents in the circumferential direction and the longitudinal direction, the recycled concrete in internal core mainly shows shear failure and crush failure. The axial compressive bearing capacity of the specimen decreases with the increase of the replacement ratio of recycled coarse aggregate and slenderness ratio, the maximum reduction are 13.72% and 11.08% respectively. With the increasing of the strength of recycled concrete, the maximum increase of axial compressive bearing capacity is7.59%. Based on this, considering the unfavorable influences of the replacement ratio of recycled coarse aggregate and slenderness ratio on the axial compressive bearing capacity of the column, the formulas for calculating the axial compressive bearing capacity of restrained recycled concrete columns with glass fiber tube are proposed. The calculated values are in good agreement with the experimental values. The conclusions provide a reference for scientific research and related engineering applications.
In order to study the mechanical properties of recycled concrete under axial compression of glass fiber tube constrained components, 13 specimens were designed for axial compression tests, the whole failure process of compression specimens and failure modes were observed, the curves of load-displacement of glass fiber tube confined recycled concrete columns were obtained, the influences of the replacement ratio of recycled coarse aggregate, the strength of recycled coarse concrete and the slenderness ratio on the axial compression performance of restrained recycled concrete columns with glass fiber tube are analyzed. The test results show that the glass fiber tube may effectively improve the component's axial compressive capacity, and the glass fiber tube breaks to different extents in the circumferential direction and the longitudinal direction, the recycled concrete in internal core mainly shows shear failure and crush failure. The axial compressive bearing capacity of the specimen decreases with the increase of the replacement ratio of recycled coarse aggregate and slenderness ratio, the maximum reduction are 13.72% and 11.08% respectively. With the increasing of the strength of recycled concrete, the maximum increase of axial compressive bearing capacity is7.59%. Based on this, considering the unfavorable influences of the replacement ratio of recycled coarse aggregate and slenderness ratio on the axial compressive bearing capacity of the column, the formulas for calculating the axial compressive bearing capacity of restrained recycled concrete columns with glass fiber tube are proposed. The calculated values are in good agreement with the experimental values. The conclusions provide a reference for scientific research and related engineering applications.
引文
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[18]苏志.GFRP-再生混凝土-钢双管长柱轴压性能研究[D].广州:广东工业大学,2016.(SU Zhi.Axial compression test of GFRP-recycled concrete-steel double-skin tubular long columns[D].Guangzhou:Guangdong University of Technology,2016(in Chinese)).
[19]王长诚.FRP约束薄壁圆钢管再生混凝土长柱轴压性能研究[D].南昌:东华理工大学,2007.(WANG Changcheng.FRP constrained thin-wall round steel tube recycled concrete long columns under axial compression stress performance research[D].Nanchang:East China University of Technology,2007(in Chinese)).
[2]REZAZADEH M,CARVELLI V,VELJKOVIC A.Modelling bond of GFRP rebar and concrete[J].Construction and building materials,2017,153(10):102-116.
[3]肖建庄,黄一杰.GFRP管约束再生混凝土柱抗震性能与损伤评价[J].土木工程学报,2012,45(11):112-120.(XIAO Jianzhuang,HUANG Yijie.On the seismic behavior and damage assessment of recycled aggregate concrete filled GFRP tube column[J].China civil engineering journal,2012,45(11):112-120(in Chinese)).
[4]YUAN J S,HADI M N S.Bond-slip behaviour between GFRPI-section and concrete[J].Composites part B engineering,2017,130(12):76-89.
[5]肖建庄,刘胜,TRESSERRAS J,等.钢管/GFRP管约束再生混凝土柱偏心受压试验[J].建筑科学与工程学报,2015,32(2):21-26.(XIAO Jianzhuang,LIU Sheng,TRESSERRAS J,et al.Eccentric loading test on recycled aggregate concrete columns confined by steel tube/GFRP tube[J].Journal of architecture and civil engineering,2015,32(2):21-26(in Chinese)).
[6]KHORRAMAIN K,SADEGHIAN P.Experimental and analytical behavior of short concrete columns reinforced with GFRP bars under eccentric loading[J].Engineering structures,2017,151(11):761-773.
[7]李培培.BFRP-PVC管自密实再生混凝土短柱轴心受压力学性能研究[D].辽宁:辽宁工业大学,2015.(LI Peipei.The research of mechanical behavior of BFRP-PVC tube self-compacting recycled concrete short-column under uniaxial compression[D].Liaoning:Liaoning University of Technology,2015(in Chinese)).
[8]TEKLE B H,KHENNANE A,KAYALI O.Bond behaviour of GFRPreinforcement in alkali activated cement concrete[J].Construction and building materials,2017,154(11):972-982.
[9]XIE W,CHEN Y,HAN S,et al.Research on I steel reinforced concrete-filled GFRP tubular short columns[J].Thin-walled structures,2017,120(11):282-296.
[10]肖建庄.再生混凝土[M].北京:中国建筑工业出版社,2008.(XIAOJianzhuang.Recycled concrete[M].Beijing:China Architecture&Building Press,2008(in Chinese)).
[11]薛建阳,马辉,陈宗平,等.型钢再生混凝土组合柱轴压性能试验研究[J].建筑结构,2013,30(7):73-76.(XUE Jianyang,MAHui,CHEN Zongping,et al.Experimental study on axial compressive behavior of steel reinforced recycled concrete composite columns[J].Building structure,2013,30(7):73-76(in Chinese)).
[12]王妮,陈宗平,李启良,等.型钢再生混凝土组合柱轴压性能试验研究[J].工程力学,2013,30(6):133-141.(WANG Ni,CHENZongping,LI Qiliang,et al.Experimental study on the behavior of steel reinforced recycled aggregate concrete composite columns under axial compression loading[J].Engineering mechanics,2013,30(6):133-141(in Chinese)).
[13]陈宗平,李启良,张向冈,等.钢管再生混凝土偏压柱受力性能及承载力计算[J].土木工程学报,2012,45(10):72-80.(CHENZongping,LI Qiliang,ZHANG Xianggang,et al.Mechanical behavior and bearing capacity calculation of recycled aggregate concrete-filled circular steel tube columns under eccentric loading[J].China civil engineering journal,2012,45(10):72-80(in Chinese)).
[14]马辉,胡广宾,李哲,等.基于统一强度理论的圆钢管型钢再生混凝土短柱轴压承载力分析[J].应用力学学报,2017,34(6):1174-1180.(MA Hui,HU Guangbin,LI Zhe,et al.Analysis on axial bearing capacity of recycled concrete filled circular steel tube-profile steel short columns based on unified strength theory[J].Chinese journal of applied mechanics,2017,34(6):1174-1180(in Chinese)).
[15]中华人民共和国住房和城乡建设部.混凝土用再生骨料规范:GB/T-25177-2010[S].北京:中国标准出版社,2010.(Ministry of Housing and Urban-Rural Development of the People's Republic of China.Recycled coarse aggregate for concrete:GB/T-25177-2010[S].Beijing:Standard Press of China,2010(in Chinese)).
[16]吴刚,吕志涛.FRP约束混凝土圆栓无软化取时的应力-应变关系研究[J].建筑结构学报,2003,24(5):1-9.(WU Gang,LüZhitao.Study on the stress-strain relationship of FRP-confined concrete circular column without a strain-softening restrained[J].Journal of building structures,2003,24(5):1-9(in Chinese)).
[17]韩林海,杨有福.现代钢管混凝土结构技术[M].北京:中国建筑工业出版社,2004.(HAN Linhai,YANG Youfu.Theory and application on steel tube filled with concrete[M].Beijing:China Architecture&Building Press,2004(in Chinese)).
[18]苏志.GFRP-再生混凝土-钢双管长柱轴压性能研究[D].广州:广东工业大学,2016.(SU Zhi.Axial compression test of GFRP-recycled concrete-steel double-skin tubular long columns[D].Guangzhou:Guangdong University of Technology,2016(in Chinese)).
[19]王长诚.FRP约束薄壁圆钢管再生混凝土长柱轴压性能研究[D].南昌:东华理工大学,2007.(WANG Changcheng.FRP constrained thin-wall round steel tube recycled concrete long columns under axial compression stress performance research[D].Nanchang:East China University of Technology,2007(in Chinese)).