钢纤维混凝土桩水平承载特性试验研究
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摘要
为研究钢纤维混凝土桩水平荷载下的受力特性,开展了单桩水平静载试验,并设置素混凝土桩作为对比工况,将弯钩型钢纤维掺入混凝土桩进行试验,对比分析了钢纤维混凝土桩与素混凝土桩在水平荷载作用下的桩顶变位、桩身变形以及桩侧土抗力的变化规律,并对钢纤维混凝土桩基于水平荷载工况下的作用机理进行了分析.结果表明:由于钢纤维混凝土具有良好的抗拉性能,钢纤维的掺入对桩的水平承载特性有所提升,水平荷载下钢纤维混凝土桩相对于素混凝土桩来说,桩顶位移、桩身最大弯矩、桩侧土抗力均得到了有效控制,桩身最大弯矩大致分布在入土深度约0.43m,桩身弯矩影响深度约为0.85m.
In order to study the mechanical characteristics of steel fiber reinforced concrete pile under horizontal load,a single pile horizontal static test is carried out,when working condition with plain concrete pile is set incontrast test.The experiment of bending hook steel fiber being mixed with concrete pile is carried out,then we compare and analyze the change law of pile top displacement,pile body deformation and pile side soil resistance when steel fiber reinforced concrete pile and plain concrete pile are under horizontal load.And the mechanism of steel fiber reinforced concrete pile under horizontal load is analyzed.The results show that the reason why permeation of steel fibers can improve horizontal bearing capacity of pile is owing to the good tensile performance of steel fiber reinforced concrete.Compared with the plain concrete pile,the displacement of pile top,the maximum bending distance of pile body and pile side soil resistance are effectivelycontrolled when the steel fiber piles reinforced concrete are under horizontal load.The maximum bending distance of pile body is approximately distributed with the soil depth of about 0.43 m,and the bending moment of pile body has a influence depth of about 0.85 m.
In order to study the mechanical characteristics of steel fiber reinforced concrete pile under horizontal load,a single pile horizontal static test is carried out,when working condition with plain concrete pile is set incontrast test.The experiment of bending hook steel fiber being mixed with concrete pile is carried out,then we compare and analyze the change law of pile top displacement,pile body deformation and pile side soil resistance when steel fiber reinforced concrete pile and plain concrete pile are under horizontal load.And the mechanism of steel fiber reinforced concrete pile under horizontal load is analyzed.The results show that the reason why permeation of steel fibers can improve horizontal bearing capacity of pile is owing to the good tensile performance of steel fiber reinforced concrete.Compared with the plain concrete pile,the displacement of pile top,the maximum bending distance of pile body and pile side soil resistance are effectivelycontrolled when the steel fiber piles reinforced concrete are under horizontal load.The maximum bending distance of pile body is approximately distributed with the soil depth of about 0.43 m,and the bending moment of pile body has a influence depth of about 0.85 m.
引文
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[14]何桥敏,周丽.不同钢纤维掺量及黏结剂对混凝土性能的影响[J].中外公路,2018,38(5):267-270.HE Qiaomin,ZHOU Li.Effects of different steel fiber content and binder on concrete performance[J].Journal of China&Foreign Highway,2018,38(5):267-270.(in Chinese)
[15]徐礼华,李长宁,李彪,等.循环受压状态下钢纤维混凝土一维弹塑性损伤本构模型研究[J].土木工程学报,2018,51(11):77-87.XU Lihua,LI Changning,LI Biao,et al.Investigation on 1Delasto-plastic constitutive model of steel fiber reinforced concrete under uniaxial cyclic compression[J].China Civil Engineering Journal,2018,51(11):77-87.(in Chinese)
[2]刘汉龙,陶学俊,张建伟,等.水平荷载作用下PCC桩复合地基工作性状[J].岩土力学,2010,31(9):2716-2722.LIU Hanlong,TAO Xuejun,ZHANG Jianwei,et al.Behavior of PCC pile composite foundation under lateral load[J].Rock and Soil Mechanics,2010,31(9):2716-2722.(in Chinese)
[3]TROCHANIS A M,BIELAK J,CHRISTIANO P.Three-dimensional nonlinear study of piles[J].Journal of Geotechnical Engineering,1991,117(3):429-447.
[4]MEERA R S,SHANKER K,BASUDHAR P K.Flexural response of piles under liquefied soil conditions[J].Geotechnical and Geological Engineering,2007,25(4):409-422.
[5]马金栋,孔德志,张建伟.变截面工字形钢筋混凝土桩水平承载特性模型试验研究[J].建筑结构,2014,44(17):69-71.MA Jindong,KONG Dezhi,ZHANG Jianwei.Model test study on bearing capacity performance of variable cross-section I-shaped reinforced concrete pile under horizontal load[J].Building Structure,2014,44(17):69-71.(in Chinese)
[6]魏焕卫,李俊,徐德亭.侧向受荷桩基变形和受力规律的研究[J].山东建筑大学学报,2010,25(3):293-296.WEI Huanwei,LI Jun,XU Deting.Research of deformation and force law of adjacent pile affected by surface excessive load[J].Journal of Shandong Jianzhu University,2010,25(3):293-296.(in Chinese)
[7]袁炳祥,吴跃东,陈锐,等.侧向受荷桩周土体内部位移场的模型试验研究[J].浙江大学学报(工学版),2016,50(10):2031-2036.YUAN Bingxiang,WU Yuedong,CHEN Rui,et al.Model tests on displacement field of internal soil induced by laterally loading pile[J].Journal of Zhejiang University(Engineering Science),2016,50(10):2031-2036.(in Chinese)
[8]郭亮,周峰,李俊才,等.多次注浆微型桩水平承载力试验与数值模拟分析[J].南京工业大学学报(自然科学版),2010,32(6):64-70.GUO Liang,ZHOU Feng,LI Juncai,et al.Numerical simulation analysis and horizontal bearing capacity test of multiple grouting micro-piles[J].Journal of Nanjing University of Technology(Natural Science Edition),2010,32(6):64-70.(in Chinese)
[9]王建华,杨海明.软土中桶型基础水平循环承载力的模型试验[J].岩土力学,2008,29(10):2606-2612.WANG Jianhua,YANG Haiming.Model tests on horizontal cyclic bearing capacity of bucket foundations in soft clays[J].Rock and Soil Mechanics,2008,29(10):2606-2612.(in Chinese)
[10]夏冬桃,张严方,张周强,等.混杂纤维喷射混凝土弯曲韧性圆板法试验研究[J].建筑结构,2015,45(12):18-22.XIA Dongtao,ZHANG Yanfang,ZHANG Zhouqiang,et al.Round panel test study on flexural toughness of hybrid fiber shotcreting[J].Building Structure,2015,45(12):18-22.(in Chinese)
[11]欧阳芳,张建经,邓小宁,等.钢纤维混凝土桩承载特性模型试验[J].上海交通大学学报,2016,50(3):364-369.OUYANG Fang,ZHANG Jianjing,DENG Xiaoning,et al.Analysis of load capacity behaviors of steel fiber reinforced concrete piles through model tests[J].Journal of Shanghai Jiaotong University,2016,50(3):364-369.(in Chinese)
[12]尤志国,付秀艳,周云龙,等.钢纤维混凝土抗弯性能及断面处纤维分布规律研究[J].工业建筑,2017,47(2):123-127.YOU Zhiguo,FU Xiuyan,ZHOU Yunlong,et al.Research on flexural behavior of steel fiber reinforced concrete and its fiber distribution[J].Industrial Construction,2017,47(2):123-127.(in Chinese)
[13]张延年,李振会,刘晓阳,等.钢纤维混凝土的拉压比试验[J].江苏大学学报(自然科学版),2017,38(6):719-723.ZHANG Yannian,LI Zhenhui,LIU Xiaoyang,et al.Experiment on tension-compression ratio of steel fiber reinforced concrete[J].Journal of Jiangsu University(Natural Science Edition),2017,38(6):719-723.(in Chinese)
[14]何桥敏,周丽.不同钢纤维掺量及黏结剂对混凝土性能的影响[J].中外公路,2018,38(5):267-270.HE Qiaomin,ZHOU Li.Effects of different steel fiber content and binder on concrete performance[J].Journal of China&Foreign Highway,2018,38(5):267-270.(in Chinese)
[15]徐礼华,李长宁,李彪,等.循环受压状态下钢纤维混凝土一维弹塑性损伤本构模型研究[J].土木工程学报,2018,51(11):77-87.XU Lihua,LI Changning,LI Biao,et al.Investigation on 1Delasto-plastic constitutive model of steel fiber reinforced concrete under uniaxial cyclic compression[J].China Civil Engineering Journal,2018,51(11):77-87.(in Chinese)