冻融循环作用后栓钉连接件受剪性能试验研究
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摘要
为了研究冻融循环作用对栓钉连接件受剪性能的影响,制作了12个栓钉连接件,改变冻融循环次数(0、50、100、150次)后进行栓钉连接件推出试验,同时制作棱柱体试块和立方体试块用以检测达到相应的冻融循环次数后混凝土的动弹性模量以及抗压强度。试验结果表明:冻融循环次数越多,栓钉连接件和混凝土试块的损伤越大;随着冻融循环次数的增加,混凝土表面水泥砂浆层会加速剥落,相对动弹性模量和立方体抗压强度以及栓钉连接件的受剪承载力和受剪刚度均会显著下降;当冻融循环次数不超过50次时,开裂刚度的下降速率最快,且冻融循环次数对开裂荷载的影响大于极限荷载。
To study the effect of freeze-thaw cycles on the shear capacity of stud connectors,12 specimens were made for push-out tests. The main test variable was the number of freeze-thaw cycles( 0,50,100,150 times). At the same time,prismatic and cube specimens were made to check the dynamic elastic modulus and the compressive strength of concrete. The test results show that the degradation of stud shear connectors and cubic concrete specimens are more serious with the larger number of freeze-thaw cycles; due to the increasing number of freeze-thaw cycles,the surface failures of concrete are more serious,meanwhile,the relative dynamic modulus of elasticity,compressive strength of concrete specimens,shear bearing capacity and shear stiffness decrease. When the number of freeze-thaw cycles is smaller than 50,their effects on the decrease of shear bearing capacity and shear stiffness are the largest. The effect of freeze-thaw cycles on the cracking load is found to be greater than that on the ultimate load.
To study the effect of freeze-thaw cycles on the shear capacity of stud connectors,12 specimens were made for push-out tests. The main test variable was the number of freeze-thaw cycles( 0,50,100,150 times). At the same time,prismatic and cube specimens were made to check the dynamic elastic modulus and the compressive strength of concrete. The test results show that the degradation of stud shear connectors and cubic concrete specimens are more serious with the larger number of freeze-thaw cycles; due to the increasing number of freeze-thaw cycles,the surface failures of concrete are more serious,meanwhile,the relative dynamic modulus of elasticity,compressive strength of concrete specimens,shear bearing capacity and shear stiffness decrease. When the number of freeze-thaw cycles is smaller than 50,their effects on the decrease of shear bearing capacity and shear stiffness are the largest. The effect of freeze-thaw cycles on the cracking load is found to be greater than that on the ultimate load.
引文
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[18]邹超英,赵娟,梁锋,等.冻融作用后混凝土力学性能的衰减规律[J].建筑结构学报,2008,29(1):117-123.(ZOU Chaoying,ZHAO Juan,LIANG Feng,et al.Degradation of mechanical properties of concrete caused by freeze-thaw action[J].Journal of Building Structures,2008,29(1):117-123.(in Chinese))
[19]郑双杰,刘玉擎.开孔板连接件初期抗剪刚度试验[J].中国公路学报,2014,27(11):69-75.(ZHENG Shuangjie,LIU Yuqing.Experiment of initial shear stiffness of perfobond connector[J].China Journal of Highway and Transport,2014,27(11):69-75.(in Chinese))
[20]刘永健,李慧,张宁.界面状态对矩形钢管混凝土构件抗弯性能的影响[J].建筑科学与工程学报,2016,33(1):15-21.(LIU Yongjian,LI Hui,ZHANGNing.Influence of interface state of rectangular concretefilled steel tube on flexural performance of component[J].Journal of Architecture and Civil Engineering,2016,33(1):15-21.(in Chinese))
[21]刘永健,李慧,张宁,等.PBL加劲型矩形钢管混凝土界面粘结-滑移性能[J].建筑科学与工程学报,2015,32(5):1-7.(LIU Yongjian,LI Hui,ZHANGNing,et al.Interface bond-slip performance of rectangular concrete-filled steel tube stiffened by PBL[J].Journal of Architecture and Civil Engineering,2015,32(5):1-7.(in Chinese))
[2]OLLGAARD J G,SLUTTER R G,FISHER J W.Shear strength of stud connectors in lightweight and normal weight concrete[J].Engineering Journal,1971,8(2):55-64.
[3]丁敏,薛伟辰,王骅.钢-高性能混凝土组合梁栓钉连接件抗剪性能的试验[J].工业建筑,2007,37(8):9-13.(DING Min,XUE Weichen,WANG Hua.Experiment on stud shear connectors in steel-high performance concrete composite beams[J].Industrial Construction,2007,37(8):9-13.(in Chinense))
[4]杨兰州.外包钢管混凝土抗冻耐久性试验研究与理论分析[D].成都:西南交通大学,2008.(YANGLanzhou,Experimental study and theoretical analysis for the freeze proof durability of concrete filled steel tube[D].Chengdu:Southwest Jiaotong University,2008.(in Chinese))
[5]杨有福,曹凯,杨志泉,等.冻融循环作用后钢管混凝土轴压短柱力学性能[J].中国公路学报,2014,27(3):51-58.(YANG Youfu,CAO Kai,YANGZhiquan,et al.Mechanical properties of concrete-filled steel tubular stubs after freezing and thawing cycles under axial loading[J].China Journal of Highway and Transport,2014,27(3):51-58.(in Chinese))
[6]YANG Y,CAO K,WANG T.Experimental behavior of CFST stub columns after being exposed to freezing and thawing[J].Cold Regions Science and Technology,2013,89:7-21.
[7]常虹,宿晓萍,沙勇.冻融循环作用下混凝土构件受压性能损伤试验研究[J].工业建筑,2018,48(3):26-30.(CHANG Hong,SU Xiaoping,SHA Yong.Experimental research on compressive damage of concrete member under freeze-thaw cycles[J].Industrial Construction,2018,48(3):26-30.(in Chinese))
[8]汪青杰,张延年,刘旭峰,等.冻融循环作用下混凝土短柱轴心受压试验研究[J].建筑结构学报,2014,35(增刊2):165-170.(WANG Qingjie,ZHANG Yannian,LIU Xufeng,et al.Experimental study on concrete short columns under axial compression in an environment of freeze-thaw cycles[J].Journal of Building Structures,2014,35(Suppl.2):165-170.(in Chinese))
[9]陈宝春,陈津凯.钢管混凝土内栓钉抗剪承载力试验研究[J].工程力学,2016,33(2):66-73.(CHENBaochun,CHEN Jinkai.Experimental studies on shearbearing capacity of headed stud in concrete-filled steel tube[J].Engineering Mechanics,2016,33(2):66-73.(in Chinese))
[10]European Committee for Standardization.Design of composite steel and concrete structures:part 1.1:general rules and rules for buildings:EN 1994-1-1:2004[S].Brussels,Belgium:European Committee for Standardization,2004.
[11]普通混凝土长期性能和耐久性能试验:GB/T50082-2009[S].北京:中国建筑工业出版社,2009.(Standard for test mechanical properties on ordinary concrete:GB/T 50082-2009[S].Beijing:China Architecture&Building Press,2009.(in Chinese))
[12]丁发兴,倪鸣,龚永智,等.栓钉剪力连接件滑移性能试验研究及受剪承载力计算[J].建筑结构学报,2014,35(9):98-106.(DING Faxing,NI Ming,GONG Yongzhi,et al.Experimental study on slip behavior and calculation of shear bearing capacity for shear stud connectors[J].Journal of Building Structures,2014,35(9):98-106.(in Chinese))
[13]宁作君.冻融作用下混凝土的损伤与断裂研究[D].哈尔滨:哈尔滨工业大学,2009.(NING Zuojun.Research on damage and fracture of concrete subjected to freeze-thaw cycles[D].Harbin:Harbin Institute of Technology,2009.(in Chinese))
[14]POWERS T C.A working hypothesis for further studies of frost resistance of concrete[J].Journal of the American Concrete Institute,1945,16(4):245-272.
[15]POWERS T C.Freezing effects in concrete[J].ACISpecial Publication,1975,47:1-12.
[16]肖前慧.冻融环境多因素耦合作用混凝土结构耐久性研究[D].西安:西安建筑科技大学,2010.(XIAO Qianhui.Concrete structure durability in freezing-thawing circumstance based on multi-factor effects[D].Xi’an:Xi’an Uiversity of Architecture&Technology,2010.(in Chinese))
[17]冀晓东,宋玉普.冻融循环后光圆钢筋与混凝土粘结性能退化机理研究[J].建筑结构学报,2011,32(1):70-74.(JI Xiaodong,SONG Yupu.Mechanism of bond degradation between concrete and plain steel bar after freezing and thawing[J].Journal of Building Structures,2011,32(1):70-74.(in Chinese))
[18]邹超英,赵娟,梁锋,等.冻融作用后混凝土力学性能的衰减规律[J].建筑结构学报,2008,29(1):117-123.(ZOU Chaoying,ZHAO Juan,LIANG Feng,et al.Degradation of mechanical properties of concrete caused by freeze-thaw action[J].Journal of Building Structures,2008,29(1):117-123.(in Chinese))
[19]郑双杰,刘玉擎.开孔板连接件初期抗剪刚度试验[J].中国公路学报,2014,27(11):69-75.(ZHENG Shuangjie,LIU Yuqing.Experiment of initial shear stiffness of perfobond connector[J].China Journal of Highway and Transport,2014,27(11):69-75.(in Chinese))
[20]刘永健,李慧,张宁.界面状态对矩形钢管混凝土构件抗弯性能的影响[J].建筑科学与工程学报,2016,33(1):15-21.(LIU Yongjian,LI Hui,ZHANGNing.Influence of interface state of rectangular concretefilled steel tube on flexural performance of component[J].Journal of Architecture and Civil Engineering,2016,33(1):15-21.(in Chinese))
[21]刘永健,李慧,张宁,等.PBL加劲型矩形钢管混凝土界面粘结-滑移性能[J].建筑科学与工程学报,2015,32(5):1-7.(LIU Yongjian,LI Hui,ZHANGNing,et al.Interface bond-slip performance of rectangular concrete-filled steel tube stiffened by PBL[J].Journal of Architecture and Civil Engineering,2015,32(5):1-7.(in Chinese))