Bond-Slip Performance of Steel Tubular Composite Piles
-
摘要: 为研究内置剪力环、泥皮和防腐涂层的钢管复合桩的粘结-滑移性能,假定钢管复合桩粘结应力沿界面呈指数变化规律,提出了一种新的钢管复合桩粘结-滑移本构理论分析模型.依托港珠澳大桥建设,开展了5组钢管复合桩推出试验(其中2组试件设有剪力环),验证了本文模型的正确性. 试验结果表明:在外荷载作用下,钢管与混凝土粘结滑移和钢管应力理论计算结果与实验结果基本吻合;粘结破坏时钢管于核心混凝土相对滑移量均小于0.2 mm,泥皮和防腐涂层降低了钢管与核心混凝土之间的粘结;在剪力环间距为1D(D为桩径)的条件下,剪力环使钢管复合桩的粘结强度提高约50%,泥皮和防腐涂层对钢管复合桩的弱化效应可不计.钢管复合桩粘结应力沿界面基本呈指数规律变化.Abstract: To investigate the bond-slip performance of steel tubular composite (STC) piles with shear ring, drilling mud skin and anti-corrosion coating, a new bond-slip constitutive model of the STC piles was proposed assuming an exponential trend of adhesion stress along the length of interface. The correctness of the model was then verified using five push-out tests of STC piles conducted in construction of the Hong Kong-Zhuhai-Macao Bridge, among which two tests adopted pile samples with shear ring. Results showed that under the external load the theoretical predictions of the bond-slip displacement between steel tube and concrete and the stress of steel pipes were consistent with the experimental results. The relative slip displacement between steel tube and concrete was less than 0.2 mm when the failure of piles was induced by the bond-slip behavior. The adhesion stress between the steel tubes and concrete was reduced by drilling mud skin and anti-corrosion coating. The average bond strength of STC piles was increased by 50% because of the shear ring when the spacing of shear ring was 1D (where D is the diameter of the pile), while adverse effects of drilling mud skin and anti-corrosion coating would be ignored under this condition. In addition, the exponential relationship between adhesion stress and the length of interface was observed.
-
董宇光. 型钢与混凝土粘结-滑移关系及型钢混凝土剪力墙抗震性能研究[D]. 上海:同济大学,2006. 刘永健,池建军. 钢管混凝土界面抗剪粘结强度的推出试验[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. 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. SHAKIRK H. Pushout strength of concrete-filled steel hollow section tubes[J]. 1993, 71(13): 230-233. 康希良. 钢管混凝土组合力学性能及粘结滑移性能研究[D]. 西安:西安建筑科技大学,2008. 康希良,程耀芳,涂昀,等. 钢管混凝土粘结-滑移性能试验研究及数值分析[J]. 工程力学,2010(9): 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(9): 102-106. 李英铭. 圆钢管混凝土短柱轴压、粘结滑移试验和分析[D]. 沈阳:沈阳建筑大学,2011. 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,2011,27(5): 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, 27(5): 882-885. 任德良,刘世臣,刘来君. 钢管混凝土粘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. 王友元,苏林王. 钢管桩与混凝土芯粘结力及抗弯应力传递模拟试验研究[J]. 水运工程,2005(9): 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(9): 3-6. 吴美艳,余天庆. 剪力环对钢管混凝土粘结强度影响的试验[J]. 湖北工学院学报,2004(1): 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(1): 6-8. 张丽. 钢管混凝土粘结滑移性能试验研究及性能分析[D]. 兰州:兰州交通大学,2010. 张敏. 复杂受力状态下钢管复合桩的工作特性研究[D]. 成都:西南交通大学,2014. 中华人民共和国建设部. GB500172003 钢结构设计规范[S]. 北京:中国计划出版社,2003. 张敏,马建林,吴伟胜,等. 复杂受力状态下钢管复合桩粘结性能试验研究[J]. 华中科技大学学报:自然科学版,2013,41(9): 67-71. ZHAND Min, Ma Jianlin, WU Weisheng, et al. Experimental study on bond behavior of steel tubular composite pile under complex stress condition[J]. J. Huazhong Univ. of Sci. Tech.: Natural Science Edition, 2013, 419: 67-71. 中华人民共和国建设部. GB500102010 混凝土结构设计规范[S]. 北京:中国建筑工业出版社,2010. 中华人民共和国住房和城乡建设部. GBT 501522012 混凝土结构试验方法标准[S]. 北京:中国建筑工业出版社,2012. 薛立红,蔡绍怀. 钢管混凝土抗剪连接件的试验研究[J]. 建筑科学,1998(1): 13-21. XUE Lihong, CAI Shaohuai. Experimental study on shear connectors of concrete-filled steel tube[J]. Building Science, 1998(1): 13-21. YANKELEVSKY D Z. Bond action between concrete and deformed bar a new model[J]. Journal of the American Concrete Institute, 1985(2): 154-161. SOMAYAJI S, SHAH S P. Bond stress versus slip relationship and response of tension members[J]. Journal of the American Concrete Institute, 1981(3): 217-225.
点击查看大图
计量
- 文章访问数: 484
- HTML全文浏览量: 75
- PDF下载量: 114
- 被引次数: 0