聚丙烯腈纤维混凝土墩柱抗震性能试验研究
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摘要
为研究掺入聚丙烯腈纤维的混凝土墩柱的抗震性能,设计制作了3组9个具有不同纤维掺入方式的聚丙烯腈纤维混凝土墩柱试件,并对3组墩柱试件开展不同轴压比下的单向水平拟静力试验.试验结果表明:掺入适量的聚丙烯腈纤维,可使混凝土墩柱试件在极限状态下不出现保护层混凝土剥落的现象,提高其位移延性、水平极限承载力和滞回耗能能力,且轴压比越大,位移延性和水平极限承载力的提高幅度越大,而滞回耗能能力的提高幅度却相对减小;掺入聚丙烯腈纤维,基本没有改善混凝土墩柱试件的刚度退化;相比单一纤维,掺入长、短混杂聚丙烯腈纤维可更好地提高混凝土墩柱试件的抗震性能.
In order to investigate the seismic behavior of polyacrylonitrile fiber reinforced concrete(PANFRC) bridge column, 3 groups of 9 PANFRC bridge column specimens made with different fiber mixing methods had been designed and casted, and unidirectional horizontal pseudo static tests had been carried out for the specimens under various axial loads. The test results showed that, with adding an appropriate amount of PAN fiber, the concrete bridge column specimens can prevent spalling of the cover concrete even under the failure limit state, and improve the displacement ductility, horizontal ultimate bearing capacity and hysteretic energy dissipation capacity; the greater the axial compression ratio, the greater the increase of the displacement ductility and the horizontal ultimate bearing capacity, and the increase of the hysteretic energy dissipation capacity is relatively reduced; adding PAN fiber does not significantly improve the stiffness degradation of the specimens; compared to add single length PAN fiber, adding long and short length hybrid PAN fibers can better improve the seismic performance of the concrete bridge column specimens.
In order to investigate the seismic behavior of polyacrylonitrile fiber reinforced concrete(PANFRC) bridge column, 3 groups of 9 PANFRC bridge column specimens made with different fiber mixing methods had been designed and casted, and unidirectional horizontal pseudo static tests had been carried out for the specimens under various axial loads. The test results showed that, with adding an appropriate amount of PAN fiber, the concrete bridge column specimens can prevent spalling of the cover concrete even under the failure limit state, and improve the displacement ductility, horizontal ultimate bearing capacity and hysteretic energy dissipation capacity; the greater the axial compression ratio, the greater the increase of the displacement ductility and the horizontal ultimate bearing capacity, and the increase of the hysteretic energy dissipation capacity is relatively reduced; adding PAN fiber does not significantly improve the stiffness degradation of the specimens; compared to add single length PAN fiber, adding long and short length hybrid PAN fibers can better improve the seismic performance of the concrete bridge column specimens.
引文
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[12] 李斌,蔡汉超,缠宏宇.聚丙烯腈纤维对混凝土强度及耐磨性的影响[J].混凝土与水泥制品,2015(4):49-53.
[13] 逄立伟.冻融交替环境下道面聚丙烯腈纤维混凝土的抗冻性能试验[J].公路工程,2017,42(3):235-240.
[14] FAN S.Mechanical and durability performance of polyacrylonitrile fiber reinforced concrete[J].Materials Research,2015,18(6):1298-1303.
[15] 中华人民共和国住房和城乡建设部.建筑抗震试验规程:JGJ/T 101—2015[S].北京:中国建筑工业出版社,2015.
[16] PRIESTLEY M J N,VERNA R,XIAO Y.Seismic shear strength of reinforced concrete columns[J].Journal of Structural Engineering,ASCE,1994,120(8):2310-2329.
[2] LAN F,LI Q,CHEN Z,et al.Experimental study on seismic performance of fiber reinforced concrete pier[J].Applied Mechanics & Materials,2013,353/354/355/356:1791-1795.
[3] ZHANG Y,HARRIES K,YUAN W.Experimental and numerical investigation of the seismic performance of hollow rectangular bridge piers constructed with and without steel fiber reinforced concrete[J].Engineering Structures,2013,48:255-265.
[4] CHEN B,FENG Z,SHI X.Study on performance of steel fiber concrete bridge pier specimens under horizontal cyclic loading[C]// MATEC Web of Conferences 130.Toyama:EDP Sciences,2017:1-5.
[5] 李秉南,戴航,张继文.碳纤维混凝土改善配置高强钢筋桥墩抗震性能试验研究[J].地震工程与工程振动,2014,34(增刊1):727-732.
[6] 吴刚,胡显奇,蒋剑彪,等.连续玄武岩纤维在墩柱抗震加固中的应用研究[C]//2005全国FRP与结构加固学术会议论文集.西安:中国土木工程学会,2005:143-148.
[7] 魏洋,吴刚,吴智深,等.不同材料环向缠绕加固混凝土墩柱抗震性能比较研究[J].世界桥梁,2008(3):36-40.
[8] 邹友林.芳纶纤维薄板加固受损RC柱抗震性能研究[D].广州:华南理工大学,2014.
[9] DAGENAIS M A,MASSICOTTE B,BOUCHER-PROULX G.Seismic retrofitting of rectangular bridge piers with deficient lap splices using ultrahigh-performance fiber-reinforced concrete[J].Journal of Bridge Engineering,2018,23(2):1-13.
[10] 曲旭光,史保华,彭洪波.聚丙烯腈纤维混凝土性能试验研究[J].混凝土,2009(4):81-82.
[11] 王春光,王建武,张勇.聚丙烯腈纤维混凝土抗冲击性能试验研究[J].混凝土与水泥制品,2017(6):49-52.
[12] 李斌,蔡汉超,缠宏宇.聚丙烯腈纤维对混凝土强度及耐磨性的影响[J].混凝土与水泥制品,2015(4):49-53.
[13] 逄立伟.冻融交替环境下道面聚丙烯腈纤维混凝土的抗冻性能试验[J].公路工程,2017,42(3):235-240.
[14] FAN S.Mechanical and durability performance of polyacrylonitrile fiber reinforced concrete[J].Materials Research,2015,18(6):1298-1303.
[15] 中华人民共和国住房和城乡建设部.建筑抗震试验规程:JGJ/T 101—2015[S].北京:中国建筑工业出版社,2015.
[16] PRIESTLEY M J N,VERNA R,XIAO Y.Seismic shear strength of reinforced concrete columns[J].Journal of Structural Engineering,ASCE,1994,120(8):2310-2329.