考虑剪力环、泥皮和防腐涂层作用的钢管复合桩推出试验研究
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摘要
依托港珠澳大桥建设,开展5组钢管复合桩推出试验,其中2组试件设有剪力环,研究钢管内置剪力环、泥皮和防腐涂层对钢管复合桩黏结-滑移性能的影响规律。试验结果表明:考虑剪力环、泥皮和防腐涂层作用的钢管复合桩的平均黏结强度为0.242~0.404MPa;剪力环、泥皮和防腐涂层的存在显著影响了其黏结-滑移性能;剪力环明显改善了钢管的受力和变形,同时增强了钢管与核心混凝土之间的联结,使钢管复合桩的平均黏结强度提高67%,而泥皮和防腐涂层使两者间的黏结强度降低;当剪力环间距为1D(D为桩径)时,泥皮和防腐涂层对钢管复合桩的不利影响可不计,钢管与混凝土两者黏结可靠;在泥皮和防腐涂层作用的条件下,剪力环试件的界面黏结应力沿轴向降低,无剪力环试件界面黏结力沿轴向变化不明显。
To investigate the effects of shear ring,drilling mud skin and anticorrosion coating on the bond-slip performances of steel tubular composite( STC) piles,five groups push-out test of STC piles with different combinations of shear ring,drilling mud skin and anticorrosion coating were conducted,in which two groups with shear ring,relying on construction of the Hong Kong-Zhuhai-Macao Bridge. The results showed that: the average bond strength of STC piles was in the range of 0. 242 ~ 0. 404 MPa,which was increased by 67% because of shear ring. The force and deformation of steel pipe was improved by shear ring,as well as the bond between steel tube and core concrete enhanced,while which was reduced by drilling mud skin and anticorrosion coating. When the spacing of shear ring was 1D( D was pile's diameter),adverse effects of drilling mud skin and anticorrosion coating would be ignored,so the bond between steel tube and core concrete was reliable. The bond stress of STC pile with shear ring reduced along with the axial direction,while the change of which of STC pile without shear ring was not obvious.
To investigate the effects of shear ring,drilling mud skin and anticorrosion coating on the bond-slip performances of steel tubular composite( STC) piles,five groups push-out test of STC piles with different combinations of shear ring,drilling mud skin and anticorrosion coating were conducted,in which two groups with shear ring,relying on construction of the Hong Kong-Zhuhai-Macao Bridge. The results showed that: the average bond strength of STC piles was in the range of 0. 242 ~ 0. 404 MPa,which was increased by 67% because of shear ring. The force and deformation of steel pipe was improved by shear ring,as well as the bond between steel tube and core concrete enhanced,while which was reduced by drilling mud skin and anticorrosion coating. When the spacing of shear ring was 1D( D was pile's diameter),adverse effects of drilling mud skin and anticorrosion coating would be ignored,so the bond between steel tube and core concrete was reliable. The bond stress of STC pile with shear ring reduced along with the axial direction,while the change of which of STC pile without shear ring was not obvious.
引文
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[11]吴美艳,余天庆.剪力环对钢管混凝土黏结强度影响的试验[J].湖北工学院学报,2004(01):6-8(Wu Meiyan,Yu Tianqing.Experimental research on the influence of bonds in bond strength of concrete filled steel tubes(CFST)[J].Journal of Hubei Polytechnic University,2004(01):6-8(in Chinese))
[12]张丽.钢管混凝土黏结—滑移性能试验研究及性能分析[D].兰州:兰州交通大学,2010(Zhang Li.Study on bond-slip performance of concrete filled steel tube and numerical analysis[D].Lanzhou Jiaotong University,2010(in Chinese))
[13]GB 50017—2003钢结构设计规范[S].北京:中国计划出版社,2003(GB 50017—2003 Code for design of steel strcutures[S].Beijing:Chinba Planning Press,2003(in Chinese))
[14]GB 50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010(GB 50010—2010 Code for design of concrete structures[S].Beijng:China Architecture&Building Press,2010(in Chinese))
[15]GBT 50152—2012混凝土结构试验方法标准[S].北京:中国建筑工业出版社,2012(GB 50152—2012Testing methods of concrete stuctures[S].Beijing:China Architecture&Building Press,2012(in Chinese))
[2]刘永健,池建军.钢管混凝土界面抗剪黏结强度的推出试验[J].工业建筑,2006,36(4):78-80(Liu Yongjian,Chi Jianjun.Push-out test on shear bond strength of cfst[J].Industrial Constructim,2006,36(4):78-80(in Chinese))
[3]Roeder C W,Cameron B,Brown C B.Composite action in concrete filled tubes[J].Journal of Structural Engineering-Asce,1999,125(5):477-484
[4]Shakir-Khalil H.Push out strength of concrete-filled steel hollow section tubes[J].1993,71(13):230-233
[5]康希良.钢管混凝土组合力学性能及黏结滑移性能研究[D].西安:西安建筑科技大学,2008(Kang Xiliang.Study on compositing mechanical performance and bondslip performance of concrete filled steel tube[D].Xi'an:Xi'an University of Architecture&Technology,2008(in Chinese))
[6]康希良,程耀芳,涂昀,等.钢管混凝土黏结-滑移性能试验研究及数值分析[J].工程力学,2010(09):102-106(Kang Xiliang,Chng Yaofang,Tu Yun,et al.Experimental study and numerical analysis of bond-slip performance for concrete filled steel tube[J].Engineering Mechanics,2010(09):102-106(in Chinese))
[7]李英铭.圆钢管混凝土短柱轴压、黏结滑移试验和分析[D].沈阳:沈阳建筑大学,2011(Li Yingming.Analysis and experiment for concrete-filled circular-steel-tube short columns under axial load and bond-slipping[D].Shenyang:Shenyang architecture university,2011(in Chinese))
[8]刘杰民,李宁,孙雅珍.钢管混凝土推出试验的力学行为分析[J].沈阳建筑大学学报:自然科学版,2011(05):882-885(Liu Jiemin,Li Ning,Sun Yazhen.Mechanical behavior analysis of push-out of concrete-filled steel tube[J].Journal of Shenyang Jianzhu University:Natural Science Edition,2011(05):882-885(in Chinese))
[9]任德良,刘世臣,刘来君.钢管混凝土黏结强度的影响因素分析[J].公路交通科技(应用技术版),2011(10):254-256
[10]王友元,苏林王.钢管桩与混凝土芯黏结力及抗弯应力传递模拟试验研究[J].水运工程,2005(09):3-6(Wang Youyuan,Su Linwang.Model experimental study on bonding strength and bending stress transfer between steel pile and concrete core of CFST pile[J].Port&Water Way Engineering,2005(09):3-6(in Chinese))
[11]吴美艳,余天庆.剪力环对钢管混凝土黏结强度影响的试验[J].湖北工学院学报,2004(01):6-8(Wu Meiyan,Yu Tianqing.Experimental research on the influence of bonds in bond strength of concrete filled steel tubes(CFST)[J].Journal of Hubei Polytechnic University,2004(01):6-8(in Chinese))
[12]张丽.钢管混凝土黏结—滑移性能试验研究及性能分析[D].兰州:兰州交通大学,2010(Zhang Li.Study on bond-slip performance of concrete filled steel tube and numerical analysis[D].Lanzhou Jiaotong University,2010(in Chinese))
[13]GB 50017—2003钢结构设计规范[S].北京:中国计划出版社,2003(GB 50017—2003 Code for design of steel strcutures[S].Beijing:Chinba Planning Press,2003(in Chinese))
[14]GB 50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010(GB 50010—2010 Code for design of concrete structures[S].Beijng:China Architecture&Building Press,2010(in Chinese))
[15]GBT 50152—2012混凝土结构试验方法标准[S].北京:中国建筑工业出版社,2012(GB 50152—2012Testing methods of concrete stuctures[S].Beijing:China Architecture&Building Press,2012(in Chinese))