考虑泥皮及径厚比影响的钢混组合桩黏结性能试验研究
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摘要
为了研究灌注桩施工过程中残留的泥皮厚度及不同钢管径厚比对钢管混凝土界面力学性能的影响,采用模拟水下浇筑混凝土的方法制备了6根钢管混凝土组合桩试件,对其进行了推出试验.通过试验分析了不同泥皮厚度及钢管径厚比下试件的荷载-滑移及黏结应力-滑移规律,研究了黏结强度计算方法.基于现有黏结强度计算模型,提出了考虑泥皮的极限黏结强度计算方法,将黏结应力-滑移本构关系简化为双线性模型,给出了相应的本构计算模型,并将简化模型计算值与试验数据做了对比分析.结果表明:泥皮的存在会降低钢混组合桩的黏结强度约10%～20%;径厚比对黏结性能的影响没有明显规律;简化模型计算的极限黏结强度值与实测值误差在20%以下,证明了简化模型的合理性.
In order to study the influence of residual mud during construction process and steel pipe with different radius-thickness ratios on the interface mechanical behavior of concrete filled steel tube,six steel tubular composite pile specimens were prepared by simulating underwater pouring of concrete for push-out tests. Through the tests,the load-slip and bond stress-slip curves were analyzed,and the bond strength calculation method was studied. Considering the influence of mud,the calculation method of ultimate bond strength is presented based on the existing bond strength calculation model. The bond stress-slip curve is simplified to be a bilinear model,and the corresponding constitutive relationship model equation is presented. And the experimental data is compared with the simplified bond stress-slip model. Experimental results show that the existence of mud weakens the bond strength of concrete-filled steel tube by approximately 10% to 20%. The influence of the radiusthickness ratio on the bond performance does not follow obvious rules. The results show that the error between the simplified model and the experimental value is smaller than 20%,which proves that the simplified constitutive relationship model is reasonable.
In order to study the influence of residual mud during construction process and steel pipe with different radius-thickness ratios on the interface mechanical behavior of concrete filled steel tube,six steel tubular composite pile specimens were prepared by simulating underwater pouring of concrete for push-out tests. Through the tests,the load-slip and bond stress-slip curves were analyzed,and the bond strength calculation method was studied. Considering the influence of mud,the calculation method of ultimate bond strength is presented based on the existing bond strength calculation model. The bond stress-slip curve is simplified to be a bilinear model,and the corresponding constitutive relationship model equation is presented. And the experimental data is compared with the simplified bond stress-slip model. Experimental results show that the existence of mud weakens the bond strength of concrete-filled steel tube by approximately 10% to 20%. The influence of the radiusthickness ratio on the bond performance does not follow obvious rules. The results show that the error between the simplified model and the experimental value is smaller than 20%,which proves that the simplified constitutive relationship model is reasonable.
引文
[1]韩林海.钢管混凝土结构[M].3版.北京:科学出版社,2016.
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[13]许开成,黄财林,陈梦成.钢管内壁粗糙程度对钢管混凝土界面黏结性能的影响研究[J].建筑结构学报,2013,34(S1):420-424.DOI:10.14006/j.jzjgxb.2013.s1.063.Xu Kaicheng,Huang Cailin,Chen Mengcheng.Research on impact of steel tube inner surface roughness on interfacial bonding behavior of CFST[J].Journal of Building Structures,2013,34(S1):420-424.DOI:10.14006/j.jzjgxb.2013.s1.063.(in Chinese)
[14]张敏,马建林,苗树,等.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[J].土木工程学报,2015,48(S2):174-179.Zhang Min,Ma Jianlin,Miao Shu,et al.Push-out test research on steel tubular composite pile with shear ring,drilling mud skin and anticorrosion coating[J].China Civil Engineering Journal,2015,48(S2):174-179.(in Chinese)
[15]刘永健,刘君平,池建军.钢管混凝土界面抗剪粘结滑移力学性能试验[J].广西大学学报(自然科学版),2010,35(1):17-23,29.DOI:10.3969/j.issn.1001-7445.2010.01.004.Liu Yongjian,Liu Junping,Chi Jianjun.Shear bond behaviors at interface of concrete-filled steel tube[J].Journal of Guangxi University(Natural Science Edition),2010,35(1):17-23,29.DOI:10.3969/j.issn.1001-7445.2010.01.004.(in Chinese)
[16]Virdi K S,Dowling P J.Bond strength in concrete filled steel tubes[J].IABSE Periodica,1980(3):125-139.
[17]辛海亮.钢管混凝土粘结滑移本构关系试验研究[D].西安:西安建筑科技大学,2008.
[18]任少华,赵鸿铁,薛建阳.方钢管混凝土粘结强度试验研究[J].建筑结构,2011,41(6):68-70.DOI:10.19701/j.jzjg.2011.06.014.Ren Shaohua,Zhao Hongtie,Xue Jianyang.Experiment research on bond strength of concrete-filled square steel tubes[J].Building Structure,2011,41(6):68-70.DOI:10.19701/j.jzjg.2011.06.014.(in Chinese)
[19]柯晓军,孙海洋,陈宗平,等.钢管高强混凝土界面力学性能试验研究及黏结强度计算[J].建筑结构学报,2015,36(S1):401-406.DOI:10.14006/j.jzjgxb.2015.S1.061.Ke Xiaojun,Sun Haiyang,Chen Zongping,et al.Interface mechanical behavior test and bond strength calculation of high-strength concrete filled circular steel tube[J].Journal of Building Structures,2015,36(S1):401-406.DOI:10.14006/j.jzjgxb.2015.S1.061.(in Chinese)
[2]Shakir-Khalil H.Push-out strength of concrete-filled steel hollow sections[J].The Structural Engineer,1993,71(13):230-233.
[3]Shakir-Khalil H.Resistance of concrete-filled steel tubes to push-out forces[J].The Structural Engineer,1993,71(13):234-243.
[4]Chen Y,Feng R,Shao Y B,et al.Bond-slip behaviour of concrete-filled stainless steel circular hollow section tubes[J].Journal of Constructional Steel Research,2017,130:248-263.DOI:10.1016/j.jcsr.2016.12.012.
[5]Grzeszykowski B,Szadkowska M,Szmigiera E.Analysis of stress in steel and concrete in CFST push-out test samples[J].Civil and Environmental Engineering Reports,2017,26(3):145-159.DOI:10.1515/ceer-2017-0042.
[6]Chen L H,Dai J X,Jin Q L,et al.Refining bond-slip constitutive relationship between checkered steel tube and concrete[J].Construction and Building Materials,2015,79:153-164.DOI:10.1016/j.conbuildmat.2014.12.058.
[7]Tao Z,Song T Y,Uy B,et al.Bond behavior in concretefilled steel tubes[J].Journal of Constructional Steel Research,2016,120:81-93.DOI:10.1016/j.jcsr.2015.12.030.
[8]Yoshida E,Suga K,Hattori Y,et al.Bearing strength of concrete and backing rings for steel and concrete composite pile[C]//Summaries of Technical Papers of Annual Meeting C-1.Tokyo,Japan,2013:495-498.
[9]乔崎云,张雯雯,曹万林,等.内置钢板抗剪连接件方钢管混凝土柱推出试验[J].华中科技大学学报(自然科学版),2018,46(3):108-115.DOI:10.13245/j.hust.180320.Qiao Qiyun,Zhang Wenwen,Cao Wanlin,et al.Pushout test of square CFST columns with steel plate shear connectors[J].Journal of Huazhong University of Science and Technology(Natural Science Edition),2018,46(3):108-115.DOI:10.13245/j.hust.180320.(in Chinese)
[10]中国建筑科学研究院.GB 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.
[11]康希良,程耀芳,张丽,等.钢管混凝土粘结-滑移本构关系理论分析[J].工程力学,2009,26(10):74-78.Kang Xiliang,Cheng Yaofang,Zhang Li,et al.Theoretical analysis of bond-slip constitutive ralationship for cfst[J].Engineering Mechanics,2009,26(10):74-78.(in Chinese)
[12]许开成,陈梦成,顾章川.钢管混凝土界面黏结力的组成试验研究[J].铁道建筑,2011(11):132-134.DOI:10.3969/j.issn.1003-1995.2011.11.041.
[13]许开成,黄财林,陈梦成.钢管内壁粗糙程度对钢管混凝土界面黏结性能的影响研究[J].建筑结构学报,2013,34(S1):420-424.DOI:10.14006/j.jzjgxb.2013.s1.063.Xu Kaicheng,Huang Cailin,Chen Mengcheng.Research on impact of steel tube inner surface roughness on interfacial bonding behavior of CFST[J].Journal of Building Structures,2013,34(S1):420-424.DOI:10.14006/j.jzjgxb.2013.s1.063.(in Chinese)
[14]张敏,马建林,苗树,等.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[J].土木工程学报,2015,48(S2):174-179.Zhang Min,Ma Jianlin,Miao Shu,et al.Push-out test research on steel tubular composite pile with shear ring,drilling mud skin and anticorrosion coating[J].China Civil Engineering Journal,2015,48(S2):174-179.(in Chinese)
[15]刘永健,刘君平,池建军.钢管混凝土界面抗剪粘结滑移力学性能试验[J].广西大学学报(自然科学版),2010,35(1):17-23,29.DOI:10.3969/j.issn.1001-7445.2010.01.004.Liu Yongjian,Liu Junping,Chi Jianjun.Shear bond behaviors at interface of concrete-filled steel tube[J].Journal of Guangxi University(Natural Science Edition),2010,35(1):17-23,29.DOI:10.3969/j.issn.1001-7445.2010.01.004.(in Chinese)
[16]Virdi K S,Dowling P J.Bond strength in concrete filled steel tubes[J].IABSE Periodica,1980(3):125-139.
[17]辛海亮.钢管混凝土粘结滑移本构关系试验研究[D].西安:西安建筑科技大学,2008.
[18]任少华,赵鸿铁,薛建阳.方钢管混凝土粘结强度试验研究[J].建筑结构,2011,41(6):68-70.DOI:10.19701/j.jzjg.2011.06.014.Ren Shaohua,Zhao Hongtie,Xue Jianyang.Experiment research on bond strength of concrete-filled square steel tubes[J].Building Structure,2011,41(6):68-70.DOI:10.19701/j.jzjg.2011.06.014.(in Chinese)
[19]柯晓军,孙海洋,陈宗平,等.钢管高强混凝土界面力学性能试验研究及黏结强度计算[J].建筑结构学报,2015,36(S1):401-406.DOI:10.14006/j.jzjgxb.2015.S1.061.Ke Xiaojun,Sun Haiyang,Chen Zongping,et al.Interface mechanical behavior test and bond strength calculation of high-strength concrete filled circular steel tube[J].Journal of Building Structures,2015,36(S1):401-406.DOI:10.14006/j.jzjgxb.2015.S1.061.(in Chinese)