快凝无机胶植筋锚固性能试验
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摘要
基于目前有机胶普遍存在的弹性模量低、易老化、耐热性能差等问题,研制出一种高强快凝的新型无机胶。对该无机胶在水平面及竖直面混凝土基材上的植筋进行了拉拔试验,通过对比不同工况下的试验结果,探究了钢筋直径、混凝土强度、锚固深度以及植筋角度等因素对植筋锚固性能的影响。基于试验现象归纳了几种典型的破坏模式,并根据试验数据绘制了2种典型破坏模式的荷载-位移曲线,分析了植筋锚固的受力机理;从结构安全性和工程经济性角度出发,通过理论推导得出了锚固深度的近似计算公式,提出了一种简单而实用的植筋设计方法,将该方法应用于试验,并将得出的试验值与计算值进行了对比。结果表明:根据均匀剪切模型,28d植筋试件的平均黏结强度可达19.65MPa,甚至更高,超过《混凝土结构化学植筋技术规程》中A级胶所要求的黏结强度(11MPa);所提出的植筋设计方法适用于各种不同工况,其锚固深度理论计算值和试验值吻合较好,可应用于今后的植筋设计中。
Based on the problems of low modulus of elasticity,easy aging and poor heat resistance of organic adhesives,a new type of inorganic adhesives with high strength and rapid solidification was developed.Through the pull-out test of the planting rebar in the horizontal and vertical planes of concrete substrates with inorganic adhesive,and comparing the test results under different working conditions,the effects of rebar diameter,concrete strength,anchoring depth and the implanted angle on the anchorage performance of rebar planting were investigated.Several typical failure patterns were concluded based on the test phenomena,and according to the test data,the load-displacement curves of two kinds of typical failure modes were drawn,the anchorage stress mechanism of planting rebar was analyzed.From the view of structural safety and engineering economy,an approximate formula for calculating anchorage depth was obtained through theoretical deduction,and a simple and practical design method for planting rebar was proposed.The method was applied to the test,and the theoretical calculation values and the test values were compared.The results show that on the basis of uniform shear model,the averagebond strength of steel specimen after 28 dcan reach 19.65 MPa or even higher,far more than the bond strength of A grade adhesive(11 MPa)which was proposed in Technical Regulation of Chemically-planted Steel Bars in Concrete Structures.The proposed design method of planting rebar is applicable to various working conditions,and the theoretical calculation results of anchoring depth are in good agreement with the experimental values.The design method of planting rebar can be applied to the future design of planting rebar.
Based on the problems of low modulus of elasticity,easy aging and poor heat resistance of organic adhesives,a new type of inorganic adhesives with high strength and rapid solidification was developed.Through the pull-out test of the planting rebar in the horizontal and vertical planes of concrete substrates with inorganic adhesive,and comparing the test results under different working conditions,the effects of rebar diameter,concrete strength,anchoring depth and the implanted angle on the anchorage performance of rebar planting were investigated.Several typical failure patterns were concluded based on the test phenomena,and according to the test data,the load-displacement curves of two kinds of typical failure modes were drawn,the anchorage stress mechanism of planting rebar was analyzed.From the view of structural safety and engineering economy,an approximate formula for calculating anchorage depth was obtained through theoretical deduction,and a simple and practical design method for planting rebar was proposed.The method was applied to the test,and the theoretical calculation values and the test values were compared.The results show that on the basis of uniform shear model,the averagebond strength of steel specimen after 28 dcan reach 19.65 MPa or even higher,far more than the bond strength of A grade adhesive(11 MPa)which was proposed in Technical Regulation of Chemically-planted Steel Bars in Concrete Structures.The proposed design method of planting rebar is applicable to various working conditions,and the theoretical calculation results of anchoring depth are in good agreement with the experimental values.The design method of planting rebar can be applied to the future design of planting rebar.
引文
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[12] GLUKHOVSKY V D,ROSTOVSKAJA G,RUMYNA G V.High Strength Slag-alkaline Cements[C]//WILLIAMS P T.Proceedings of the 7th International Congress on the Chemistry of Cement.Paris:Amarkai AB and Congrex,1980:164-168.
[13] DAVIDOVITS J.Geopolymers:Inorganic Polymeric New Materials[J].Journal of Thermal Analysis and Calorimetry,1991,37(8):1633-1656.
[14]吴其胜,李玉寿,李玉华.复合碱组分对矿渣-粉煤灰碱胶凝材料性能的影响[J].粉煤灰综合利用,2001(2):22-24.WU Qi-sheng,LI Yu-shou,LI Yu-hua.Influence of Compound Alkali on the Performance of Alkali Activated Cement with the Slag and Fly Ash[J].Fly Ash Comprehensive Utilization,2001(2):22-24.
[15]赵三银,余其俊,乔飞,等.无机矿粉对碱激发碳酸盐胶凝材料性能的影响[J].武汉理工大学学报,2004,26(7):20-23.ZHAO San-yin,YU Qi-jun,QIAO Fei,et al.Influence of Inorganic Mineral Powder on the Property of Alkali Activated-carbonatites Cementitious Material[J].Journal of Wuhan University of Technology,2004,26(7):20-23.
[16]彭小芹,刘艳萌,钟安鑫,等.高强无机锚固材料的实验研究[J].重庆建筑大学学报,2007,29(2):113-115.PENG Xiao-qin,LIU Yan-meng,ZHONG An-xin,et al.Experimental Research on High-strength Inorganic Anchoring Material[J].Journal of Chongqing Jianzhu University,2007,29(2):113-115.
[17]刘立新,许化彬,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.LIU Li-xin,XU Hua-bin,GAN Yuan-chu,et al.Experimental Investigation of the Bonded Rebar Bearing Capacity of Cement Based Inorganic Anchoring Material[J].Journal of Zhengzhou University:Engineering Science,2006,27(1):5-8.
[18]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.SHANG Shou-ping,HU Xiang-jun,WU Li-li,et al.Experimental Research on Rapid-solidification Inorganic Planting Blot[J].Journal of Hunan University:Natural Sciences,2014,41(4):61-65.
[19]尚守平,李宁,胡向军.快凝无机植筋胶栓的锚固强度与锚固刚度试验研究[J].建筑结构,2015,45(9):76-80,19.SHANG Shou-ping,LI Ning,HU Xiang-jun.Experimental Research on Anchoring Strength and Rigidity of Rapid-solidification Inorganic Planting Bolt[J].Building Structure,2015,45(9):76-80,19.
[20]郑文忠,陈伟宏,张建华.碱矿渣胶凝材料作胶粘剂的植筋性能研究[J].武汉理工大学学报,2009,31(14):10-14.ZHENG Wen-zhong,CHEN Wei-hong,ZHANG Jianhua.Experimental Research on Performance of Bonded Rebars with Alkali-activated Cementitious Material[J].Journal of Wuhan University of Technology,2009,31(14):10-14.
[21]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.WANG Xin,JIANG Chang-jiu,HUI Shou-jiang,et al.Fire Resistance Behavior of the Inorganically Post-installed Rebar Connection[J].Journal of Sichuan University:Engineering Science Edition,2013,45(4):27-33.
[22]谢群,赵永强,唐仕霖.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.XIE Qun,ZHAO Yong-qiang,TANG Shi-lin.Bondslip Behavior of Post-installed Reinforcement in Concrete with Inorganic Adhesive[J].Journal of Xi'an University of Architecture&Technology:Natural Science Edition,2015,47(6):838-842.
[23]丁红岩,梁玉国,高天宝.基于可靠度理论的无机胶植筋设计方法[J].西安建筑科技大学学报:自然科学版,2015,47(1):6-8,45.DING Hong-yan,LIANG Yu-guo,GAO Tian-bao.The Design Method of Inorganic Glue Bonded Rebars Based on Reliability Theory[J].Journal of Xi'an University of Architecture&Technology:Natural Science Edition,2015,47(1):6-8,45.
[24]高天宝,史文利,杨树标,等.混凝土无机料植筋拉拔试验研究[J].河北建筑科技学院学报,2005,22(1):36-38,53.GAO Tian-bao,SHI Wen-li,YANG Shu-biao,et al.Experimental Research on Planting Bars with Inorganic Material in Concrete[J].Journal of Hebei Institute of Architectural Science and Technology,2005,22(1):36-38,53.
[2]张鑫,李安起,赵考重.建筑结构鉴定与加固改造技术的进展[J].工程力学,2011,28(1):1-11,25.ZHANG Xin,LI An-qi,ZHAO Kao-zhong.Advances in Assessment and Retrofitting of Building Structures[J].Engineering Mechanics,2011,28(1):1-11,25.
[3]孙立富,姜磊,张世涛.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.SUN Li-fu,JIANG Lei,ZHANG Shi-tao.Test Research on the Bonding Strength of Inorganic Planting Bar[J].Sichuan Building Science,2016,42(2):94-96.
[4]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.KE Mei-sheng.Experimental Research and Engineering Application of Technique of Chemically-planted Steel Bar[J].Construction Technology,2001,30(2):13-14.
[5] COOK R A,DOERR G T,KLINGNER R E.Bond Stress Model for Design of Adhesive Anchors[J].ACI Structural Journal,1993,90(5):514-524.
[6] MCVAY M,COOK R A,KRISHNAMURTHY K.Pullout Simulation of Postinstalled Chemically Bonded Anchors[J].Journal of Structural Engineering,1996,122(9):1016-1024.
[7] COOK R A.Behavior of Chemically Bonded Anchors[J].Journal of Structural Engineering,1993,119(9):2744-2762.
[8] 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.
[9] COOK R A,KONZ R C.Factors Influencing Bond Strength of Adhesive Anchors[J].ACI Structural Journal,2001,98(1):76-86.
[10] LEE H S,NOGUCHI T,TOMOSAWA F.Evaluation of the Bond Properties Between Concrete and Reinforcement as a Function of the Degree of Reinforcement Corrosion[J].Cement and Concrete Research,2002,32(8):1313-1318.
[11]孙金墀.混凝土结构植筋锚固刍议[J].建筑结构,2002,32(1):26-30.SUN Jin-chi.Discussion on Planting Bar and Anchorage of Concrete Structures[J].Building Structures,2002,32(1):26-30.
[12] GLUKHOVSKY V D,ROSTOVSKAJA G,RUMYNA G V.High Strength Slag-alkaline Cements[C]//WILLIAMS P T.Proceedings of the 7th International Congress on the Chemistry of Cement.Paris:Amarkai AB and Congrex,1980:164-168.
[13] DAVIDOVITS J.Geopolymers:Inorganic Polymeric New Materials[J].Journal of Thermal Analysis and Calorimetry,1991,37(8):1633-1656.
[14]吴其胜,李玉寿,李玉华.复合碱组分对矿渣-粉煤灰碱胶凝材料性能的影响[J].粉煤灰综合利用,2001(2):22-24.WU Qi-sheng,LI Yu-shou,LI Yu-hua.Influence of Compound Alkali on the Performance of Alkali Activated Cement with the Slag and Fly Ash[J].Fly Ash Comprehensive Utilization,2001(2):22-24.
[15]赵三银,余其俊,乔飞,等.无机矿粉对碱激发碳酸盐胶凝材料性能的影响[J].武汉理工大学学报,2004,26(7):20-23.ZHAO San-yin,YU Qi-jun,QIAO Fei,et al.Influence of Inorganic Mineral Powder on the Property of Alkali Activated-carbonatites Cementitious Material[J].Journal of Wuhan University of Technology,2004,26(7):20-23.
[16]彭小芹,刘艳萌,钟安鑫,等.高强无机锚固材料的实验研究[J].重庆建筑大学学报,2007,29(2):113-115.PENG Xiao-qin,LIU Yan-meng,ZHONG An-xin,et al.Experimental Research on High-strength Inorganic Anchoring Material[J].Journal of Chongqing Jianzhu University,2007,29(2):113-115.
[17]刘立新,许化彬,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.LIU Li-xin,XU Hua-bin,GAN Yuan-chu,et al.Experimental Investigation of the Bonded Rebar Bearing Capacity of Cement Based Inorganic Anchoring Material[J].Journal of Zhengzhou University:Engineering Science,2006,27(1):5-8.
[18]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.SHANG Shou-ping,HU Xiang-jun,WU Li-li,et al.Experimental Research on Rapid-solidification Inorganic Planting Blot[J].Journal of Hunan University:Natural Sciences,2014,41(4):61-65.
[19]尚守平,李宁,胡向军.快凝无机植筋胶栓的锚固强度与锚固刚度试验研究[J].建筑结构,2015,45(9):76-80,19.SHANG Shou-ping,LI Ning,HU Xiang-jun.Experimental Research on Anchoring Strength and Rigidity of Rapid-solidification Inorganic Planting Bolt[J].Building Structure,2015,45(9):76-80,19.
[20]郑文忠,陈伟宏,张建华.碱矿渣胶凝材料作胶粘剂的植筋性能研究[J].武汉理工大学学报,2009,31(14):10-14.ZHENG Wen-zhong,CHEN Wei-hong,ZHANG Jianhua.Experimental Research on Performance of Bonded Rebars with Alkali-activated Cementitious Material[J].Journal of Wuhan University of Technology,2009,31(14):10-14.
[21]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.WANG Xin,JIANG Chang-jiu,HUI Shou-jiang,et al.Fire Resistance Behavior of the Inorganically Post-installed Rebar Connection[J].Journal of Sichuan University:Engineering Science Edition,2013,45(4):27-33.
[22]谢群,赵永强,唐仕霖.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.XIE Qun,ZHAO Yong-qiang,TANG Shi-lin.Bondslip Behavior of Post-installed Reinforcement in Concrete with Inorganic Adhesive[J].Journal of Xi'an University of Architecture&Technology:Natural Science Edition,2015,47(6):838-842.
[23]丁红岩,梁玉国,高天宝.基于可靠度理论的无机胶植筋设计方法[J].西安建筑科技大学学报:自然科学版,2015,47(1):6-8,45.DING Hong-yan,LIANG Yu-guo,GAO Tian-bao.The Design Method of Inorganic Glue Bonded Rebars Based on Reliability Theory[J].Journal of Xi'an University of Architecture&Technology:Natural Science Edition,2015,47(1):6-8,45.
[24]高天宝,史文利,杨树标,等.混凝土无机料植筋拉拔试验研究[J].河北建筑科技学院学报,2005,22(1):36-38,53.GAO Tian-bao,SHI Wen-li,YANG Shu-biao,et al.Experimental Research on Planting Bars with Inorganic Material in Concrete[J].Journal of Hebei Institute of Architectural Science and Technology,2005,22(1):36-38,53.