基于角度和深度的无机植筋承载力试验研究
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摘要
目前植筋工程中多为非水平面的植筋,而关于植筋锚固的试验研究多局限于水平面,其他角度(如90°,135°,180°)的植筋锚固性能尚未涉及。针对这一现状,通过混凝土框架不同角度基材面上的植筋拉拔试验,归纳出两种典型的破坏模式,分析了其植筋锚固的受力机理,并探究了锚固深度及植筋角度对植筋承载力的影响。试验结果表明:该无机胶具有良好的植筋锚固性能,水平面、垂直面、135°面及180°面的安全锚固深度分别为7d、10d、15d、20d;且植筋承载力随着锚固深度的增加而增大,随着植筋角度的增大而减小。基于试验数据,引入承载力影响系数对各试验条件下的无机植筋承载力进行了分析,并进行了线性拟合,得到了承载力影响系数与锚固深度和植筋角度的定量关系式,可以适用于各种不同的工况。通过算例验证发现其理论计算值与试验结果值吻合较好,可将该计算式应用于植筋设计中。
At present,most of the anchorage projects are non-horizontal anchorages,and the experimental studies on anchorage are mostly limited to the horizontal plane. The anchorage performance of other anchorages( eg. 90°,135°,and 180°) has not been involved. Based on this situation,through the pull-out test on the substrate surface of a concrete frame at different angles,two typical failure modes were summarized. Then the anchorage mechanism was analyzed,and the influences of the planting angle and the anchoring depth on the bearing capacity were explored. The test results showed that the inorganic adhesive had good anchorage performance,the safety anchorage depths for the horizontal plane,vertical plane,135° plane,and 180° were 7 d,10 d,15 d,and 20 d,respectively; the bearing capacity of the planting bar increased with the increase of the anchorage depth,and decreased with the increase of the anchorage angle. According to the experimental data,the influence coefficient of bearing capacity was put forward to analyze the bearing capacity of inorganic planting bar under each test condition,and a linear fitting was performed.The quantitative relationship between influence coefficient of bearing capacity,anchoring depth and planting angle was obtained,which is suitable for a variety of different conditions. The calculated results are in good agreement with the test results,so the calculation formula can be applied to the design of planting bar.
At present,most of the anchorage projects are non-horizontal anchorages,and the experimental studies on anchorage are mostly limited to the horizontal plane. The anchorage performance of other anchorages( eg. 90°,135°,and 180°) has not been involved. Based on this situation,through the pull-out test on the substrate surface of a concrete frame at different angles,two typical failure modes were summarized. Then the anchorage mechanism was analyzed,and the influences of the planting angle and the anchoring depth on the bearing capacity were explored. The test results showed that the inorganic adhesive had good anchorage performance,the safety anchorage depths for the horizontal plane,vertical plane,135° plane,and 180° were 7 d,10 d,15 d,and 20 d,respectively; the bearing capacity of the planting bar increased with the increase of the anchorage depth,and decreased with the increase of the anchorage angle. According to the experimental data,the influence coefficient of bearing capacity was put forward to analyze the bearing capacity of inorganic planting bar under each test condition,and a linear fitting was performed.The quantitative relationship between influence coefficient of bearing capacity,anchoring depth and planting angle was obtained,which is suitable for a variety of different conditions. The calculated results are in good agreement with the test results,so the calculation formula can be applied to the design of planting bar.
引文
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[19]LEEA HAN-SEUNG,TAKAFUMI NOGUCHI.Evaluation of the Bond Properties Between Concrete and Rebar as a Function of the Degree of Rebar Corrosion[J].Cement and Concrete Research,2002,32:1313-1318.
[20]刘立新,许化斌,甘元初,等.水泥基无机黏结材料植筋承载力的试验研究[J].郑州大学学报(工学版),2006,27(1):5-8.
[21]谢群,赵永强,唐仕霖,等.无机胶植筋构件粘结滑移性能研究[J].西安建筑科技大学学报(自然科学版),2015,47(6):838-842.
[2]孙立富,姜磊,张世涛,等.一种新型无机植筋胶粘结性能试验研究[J].四川建筑科学研究,2016,42(2):94-96.
[3]柯梅生.化学植筋技术的试验研究与工程应用[J].施工技术,2001,30(2):13-14.
[4]尚守平,胡向军,吴莉莉,等.快凝无机植筋胶栓试验研究[J].湖南大学学报(自然科学版),2014,41(4):61-65.
[5]张建荣,石丽忠,吴进,等.植筋锚固拉拔试验及破坏机理研究[J].结构工程师,2004,20(5):47-51.
[6]张建荣,石丽忠,杨建华,等.混凝土化学植筋锚固性能的试验研究[J].建筑结构,2006(3):17-21.
[7]尚守平,黄新中,杨甜.一种新型无机胶的植筋锚固性能试验研究[C]∥第26届全国结构工程学术会议论文集:北京:491-496.
[8]周新刚,王尤选,曲淑英.混凝土植筋锚固极限承载能力分析[J].工程力学,2002(6):82-86.
[9]司伟建,周新刚.混凝土结构植筋粘结锚固性能的试验研究[J].建筑结构,2001,31(3):9-12.
[10]李辉,张慧英,杨军.植筋混凝土柱延性和耗能能力的试验研究[J].建筑结构,2005,35(3):18-20.
[11]刘长青,凌岚,陆洲导,等.混凝土化学植筋试件耐火极限试验[J].武汉理工大学学报,2009,3(6):56-59.
[12]刘长青,余江滔,陆洲导,等.高温下植筋黏结-滑移性能试验研究[J].同济大学学报(自然科学版),2010,38(11):1579-1585.
[13]王欣,姜常玖,惠守江,等.无机胶植筋式后锚固连接的抗火性能研究[J].四川大学学报(工程科学版),2013,45(4):27-33.
[14]JAMES R W,GUARDIA C D L,MCCREARY C R.Strength of Epoxy-Grouted Anchor Bolts in Concrete[J].Journal of Structural Engineering,1987,113(12):2365-2381.
[15]LI Y J,ELIGEHAUSEN R,OUBOLT J,et al.Numerical Analysis of Quadruple Fastenings With Bonded Anchors[J].ACI Structural Journal,2002,99(2):149-15.
[16]MCVAY M,COOK R A,KRISHNAMURTHY K.Pullout Simulation of Postinstalled Chemically Bonded Anchors[J].Journal of Structural Engineering,ASCE,1996,122(9):1016-1024.
[17]COOK R A,KUNZ J,FUCHS W,et al.Behavior and Design of Single Adhesive Anchors Under Tensile Load in Uncracked Concrete[J].ACI Structural Journal,1998,95(1):9-26.
[18]COOK R A,KONZ R C.Factors Influencing Bond Strength of Adhesive Anchors[J].ACI Structural Journal,2001,98(1):76-86.
[19]LEEA HAN-SEUNG,TAKAFUMI NOGUCHI.Evaluation of the Bond Properties Between Concrete and Rebar as a Function of the Degree of Rebar Corrosion[J].Cement and Concrete Research,2002,32:1313-1318.
[20]刘立新,许化斌,甘元初,等.水泥基无机黏结材料植筋承载力的试验研究[J].郑州大学学报(工学版),2006,27(1):5-8.
[21]谢群,赵永强,唐仕霖,等.无机胶植筋构件粘结滑移性能研究[J].西安建筑科技大学学报(自然科学版),2015,47(6):838-842.