高延性混凝土加固砖柱轴压性能试验研究
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摘要
高延性混凝土(HDC)是一种具有高强度、高韧性和高耐损伤能力的新型结构材料。该文提出采用HDC面层加固砖柱,对27个砖柱试件进行了轴压性能试验研究。结果表明:1) HDC作为砌筑砂浆,可对砌体形成一定的约束作用,使砖柱的轴压承载力和变形能力均有所提高;2)HDC面层发挥了较强的套箍作用,使砖柱处于三向受压状态,承载力和变形能力均得到较大幅度提高,且改善了砖柱的脆性破坏特征;3)HDC面层与砖柱具有良好的协调工作能力,对提高砖柱的整体性能具有重要作用。考虑HDC面层对砖柱的约束作用,提出了HDC面层加固砖柱的轴压承载力计算方法,计算结果与试验结果吻合较好。该文研究结果为砌体结构加固提供了一种新方法,具有良好的推广应用前景。
Highly ductile fiber reinforced concrete(HDC) is a building material of high strength, ductility and damage tolerance. A new strengthening technique for brick columns with HDC layers was proposed in this study.27 brick columns were tested in axial compressive loading. The experimental results showed that: 1) HDC can provide confinement effects on masonry when used as mortar, thus the axial bearing capacity and deformability of brick columns were improved; 2) Under the confinement of HDC layers, the brick columns work in triaxial compression. The axial bearing capacity and the deformability were both significantly enhanced, and the brittle failure was delayed; 3) HDC layers and the core brick columns had good synergy work, which played an important role in enhancing the overall performance of brick columns. A calculation model was proposed to predict the ultimate strength of brick columns confined with HDC layers, and the calculation results agreed well with experimental results. Based on the tested results, the HDC can be used as an alternative material for masonry strengthening with broad engineering application.
Highly ductile fiber reinforced concrete(HDC) is a building material of high strength, ductility and damage tolerance. A new strengthening technique for brick columns with HDC layers was proposed in this study.27 brick columns were tested in axial compressive loading. The experimental results showed that: 1) HDC can provide confinement effects on masonry when used as mortar, thus the axial bearing capacity and deformability of brick columns were improved; 2) Under the confinement of HDC layers, the brick columns work in triaxial compression. The axial bearing capacity and the deformability were both significantly enhanced, and the brittle failure was delayed; 3) HDC layers and the core brick columns had good synergy work, which played an important role in enhancing the overall performance of brick columns. A calculation model was proposed to predict the ultimate strength of brick columns confined with HDC layers, and the calculation results agreed well with experimental results. Based on the tested results, the HDC can be used as an alternative material for masonry strengthening with broad engineering application.
引文
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[10]Li V C.On engineered cementitious composites(ECC):A review of the material and its applications[J].Advance Concrete Technology,2003,1(3):215―230.
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[14]邓明科,张阳玺,胡红波.高延性混凝土加固钢筋混凝土柱抗震性能试验研究[J].建筑结构学报,2017,38(6):86―94.Deng Mingke,Zhang Yangxi,Hu Hongbo.Experimental study on seismic behavior of reinforced concrete column strengthened with high ductile concrete[J].Journal of Building Structures,2017,38(6):86―94.(in Chinese)
[15]邓明科,高晓军,梁兴文.ECC面层加固砖墙抗震性能试验研究[J].工程力学,2013,30(6):168―174.Deng Mingke,Gao Xiaojun,Liang Xinwen.Experimental investigation on aseismic behavior of brick wall strengthened with ECC splint[J].Engineering Mechanics,2013,30(6):168―174.(in Chinese)
[16]GB/T 50129―2011,砌体基本力学性能试验方法标准[S].北京:中国建筑工业出版社,2011.GB/T 50129―2011,Standard for test method of basic mechanics properties of masonry[S].Beijing:China Architecture Industry Press,2011.(in Chinese)
[17]GB/T 2542―2012,砌墙砖试验方法[S].北京:中国建筑工业出版社,2012GB/T 2542―2012,Test methods for wall bricks[S].Beijing:China Architecture Industry Press,2012.(in Chinese)
[18]GB 50003―2011,砌体结构设计规范[S].北京:中国建筑工业出版社,2012.GB 50003―2011,Code for design of masonry structures[S].Beijing:China Architecture Industry Press,2012.(in Chinese)
[19]ACI Committee 440,Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures[S].Michigan:American Concrete Institute,2008:35―37.
[20]欧阳煜,黄奕辉,钱在兹,等.玻璃纤维(GFRP)片材约束混凝土的受力性能分析[J].土木工程学报,2004,37(3):26―34.Ouyang Yu,Huang Yihui,Qian Zaizi.Analysis of flexural behavior of concrete beam restrained with glass fiber reinforced plastic sheet[J].China Civil Engineering Journal,2004,37(3):26―34.(in Chinese)
[21]蔡绍怀,焦占拴.钢管混凝土短柱的基本性能和强度计算[J].建筑结构学报,1984,5(6):13―29.Cai Shaohuai,Jiao Zhanshuan.Behavior and ultimate strength of short concrete-filled steel tubular columns[J].Journal of Building Structures,1984,5(6):13―29.(in Chinese)
[22]欧阳煜,刘能科.外包钢加固轴心受压砖柱的受力性能分析[J].建筑结构,2006,36(11):27―29.Ouyang Yu,Liu Nengke.Analysis of flexural behavior of masonry column strengthened by wrapped steel outside under axial compression[J].Building Structure,2006,36(11):27―29.(in Chinese)
[23]DBJ61/T112―2016,高延性混凝土应用技术规程[S].北京:中国建材工业出版社,2016.DBJ61/T112―2016,Technical specification for application of high ductile concrete[S].Beijing:China Building Materials Press,2016.(in Chinese)
[2]沈祥,沙吾列提·拜开依,阿力琴·阿布力提甫,等.网状CBF增强砖砌体轴心受力性能试验研究[J].工程力学,2013,30(增刊):109―114.Shen Xiang,Sawule Bekey,Aliqin Abulitipu,et al.Experimental research on CBF mesh reinforced brick masonry under axial compressive loading[J].Engineering Mechanics,2013,30(Suppl):109―114.(in Chinese)
[3]张斯,徐礼华,杨冬民,等.纤维布加固砖砌体墙平面内受力性能有限元模型[J].工程力学,2015,32(12):233―242.Zhang Si,Xu Lihua,Yang Dongmin,et al.Finite element modeling of FRP-reinforced masonry walls under in-plane loading[J].Engineering Mechanics,2015,32(12):233―242.(in Chinese)
[4]刘新强,刘明,由世岐.FRP加固实心黏土砖短柱轴心受压试验研究[J].土木工程学报,2009,42(10):1―7.Liu Xinqiang,Liu Ming,You Shiqi.Experimental study of the axial compression of short columns of solid clay bricks strengthened with FRP sheets[J].China Civil Engineering Journal,2009,42(10):1―7.(in Chinese)
[5]黄奕辉,陈华艳,罗才松.玻璃纤维布包裹加固砖柱轴压试验研究与极限承载力分析[J].建筑结构学报,2009,30(2):136―142.Huang Yihui,Chen Huayan,Luo Caisong.Experiment study and analysis of ultimate capacity on brick masonry columns wrapped with glass fiber reinforced plastic sheet under axial compression[J].Journal of Building Structures,2009,30(2):136―142.(in Chinese)
[6]Papanicolaou C G,Triantafillou T C,Papathanasiou M,et al.Textile reinforced mortar(TRM)versus FRP as strengthening material of URM walls:out-of-plane cyclic loading[J].Materials and Structures,2008,41(1):143―157.
[7]Li V C,Leung C K Y.Steady state and multiple cracking of short random fiber composites[J].Journal of Engineering Mechanics,ASCE,1992,188(11):2246―2264.
[8]Li V C.Engineered cementitious composites-tailored composites through micromechanical modeling[C]//Banthia N,Bentur A,Mufti A.Proceedings of Fiber Reinforced Concrete:Present and the Future.Montreal:Canadian Society for Civil Engineering,1998:64―97.
[9]Li V C,WANG S,WU C.Tensile strain-hardening behavior of PVA-ECC[J].ACI Mater J,2001,98(6):483―492.
[10]Li V C.On engineered cementitious composites(ECC):A review of the material and its applications[J].Advance Concrete Technology,2003,1(3):215―230.
[11]Caner A,Zia P.Behavior and design of link slabs for jointless bridge decks[J].PCI Journal,1998,43(3):68―80.
[12]李庆华,徐世烺.超高韧性水泥基复合材料基本性能和结构应用研究进展[J].工程力学,2009,26(增刊II):23―67.Li Qinghua,Xu Shilang.Performance and application of Ultra High Toughness Cementitious Composite:a review[J].Engineering Mechanics,2009,26(Suppl II):23―67.(in Chinese)
[13]徐世烺,王楠,尹世平.超高韧性水泥基复合材料加固钢筋混凝土梁弯曲控裂试验研究[J].建筑结构学报,2011,32(9):115―122.Xu Shilang,Wang Nan,Ying Shiping.Experimental study on flexural characteristics of RC beams strengthened with post-poured ultra high toughness cementitious composites[J].Journal of Building Structures,2011,32(9):115―122.(in Chinese)
[14]邓明科,张阳玺,胡红波.高延性混凝土加固钢筋混凝土柱抗震性能试验研究[J].建筑结构学报,2017,38(6):86―94.Deng Mingke,Zhang Yangxi,Hu Hongbo.Experimental study on seismic behavior of reinforced concrete column strengthened with high ductile concrete[J].Journal of Building Structures,2017,38(6):86―94.(in Chinese)
[15]邓明科,高晓军,梁兴文.ECC面层加固砖墙抗震性能试验研究[J].工程力学,2013,30(6):168―174.Deng Mingke,Gao Xiaojun,Liang Xinwen.Experimental investigation on aseismic behavior of brick wall strengthened with ECC splint[J].Engineering Mechanics,2013,30(6):168―174.(in Chinese)
[16]GB/T 50129―2011,砌体基本力学性能试验方法标准[S].北京:中国建筑工业出版社,2011.GB/T 50129―2011,Standard for test method of basic mechanics properties of masonry[S].Beijing:China Architecture Industry Press,2011.(in Chinese)
[17]GB/T 2542―2012,砌墙砖试验方法[S].北京:中国建筑工业出版社,2012GB/T 2542―2012,Test methods for wall bricks[S].Beijing:China Architecture Industry Press,2012.(in Chinese)
[18]GB 50003―2011,砌体结构设计规范[S].北京:中国建筑工业出版社,2012.GB 50003―2011,Code for design of masonry structures[S].Beijing:China Architecture Industry Press,2012.(in Chinese)
[19]ACI Committee 440,Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures[S].Michigan:American Concrete Institute,2008:35―37.
[20]欧阳煜,黄奕辉,钱在兹,等.玻璃纤维(GFRP)片材约束混凝土的受力性能分析[J].土木工程学报,2004,37(3):26―34.Ouyang Yu,Huang Yihui,Qian Zaizi.Analysis of flexural behavior of concrete beam restrained with glass fiber reinforced plastic sheet[J].China Civil Engineering Journal,2004,37(3):26―34.(in Chinese)
[21]蔡绍怀,焦占拴.钢管混凝土短柱的基本性能和强度计算[J].建筑结构学报,1984,5(6):13―29.Cai Shaohuai,Jiao Zhanshuan.Behavior and ultimate strength of short concrete-filled steel tubular columns[J].Journal of Building Structures,1984,5(6):13―29.(in Chinese)
[22]欧阳煜,刘能科.外包钢加固轴心受压砖柱的受力性能分析[J].建筑结构,2006,36(11):27―29.Ouyang Yu,Liu Nengke.Analysis of flexural behavior of masonry column strengthened by wrapped steel outside under axial compression[J].Building Structure,2006,36(11):27―29.(in Chinese)
[23]DBJ61/T112―2016,高延性混凝土应用技术规程[S].北京:中国建材工业出版社,2016.DBJ61/T112―2016,Technical specification for application of high ductile concrete[S].Beijing:China Building Materials Press,2016.(in Chinese)