高温下钢筋与混凝土粘结锚固性能试验研究
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摘要
为研究温度对钢筋与混凝土粘结性能的影响,通过制作30个标准立方体试块、8个温度场试件及15个中心拉拔试件,分别完成了室温(20℃)、100℃、200℃、400℃、600℃下标准立方体试块抗压试验与抗拉劈裂试验、拉拔试件温度场试验及中心拉拔试验。分析了高温作用对混凝土抗压强度与抗拉强度的影响,根据温度场试验研究结果,提出一种简易的高温下中心拉拔试验方法,在此基础上研究了高温下钢筋与混凝土粘结性能退化规律。基于Harajli模型综合考虑温度对粘结强度、峰值滑移及试件破坏模式的影响,提出了高温下钢筋与混凝土粘结-滑移本构模型。试验结果表明:高温下混凝土强度、钢筋与混凝土的粘结强度随温度升高整体呈下降趋势,但在100℃时发生陡降现象,高温下钢筋与混凝土的粘结强度变化趋势与混凝土抗拉强度相近。最后提出了高温下钢筋与混凝土的粘结-滑移本构模型,并验证了模型的适用性。
To investigate the influence of temperature on the bonding performance between steel bar and concrete,thirty standard cube specimences,eight specimens for temperature field test and fifteen central pull-out test specimens were cast. After exposed to 20 ℃,100 ℃,200 ℃,400 ℃,600 ℃,the compression strength and tensile splitting strength of the standard cube specimens,temperature field test of pull-out specimen and pull-out test between rebar and concrete were tested immediately. The influence of high temperature on concrete compressive strength and tensile splitting strength are studied systematically. According to the temperature field test results,a simplified test method for the pull-out test between reinforcing bar and concrete under high temperature is proposed. The degradation law of bond behavior between rebar and concrete under elevated temperature is investigated. A bond-slip constitutive model with considering the influence of temperature on bond strength,slip and failure states is proposed based on Harajli Model. The experimental results show that the strength of concrete and the bond strength between steel bar and concrete under high temperature decline with increasing temperaturegenerally,with a steep reduction at 100 ℃. The variation trend of bond strength under high temperature is similar to the tensile strength of concrete. A bond-slip constitutive model between steel bar and concrete under high temperature is proposed.
To investigate the influence of temperature on the bonding performance between steel bar and concrete,thirty standard cube specimences,eight specimens for temperature field test and fifteen central pull-out test specimens were cast. After exposed to 20 ℃,100 ℃,200 ℃,400 ℃,600 ℃,the compression strength and tensile splitting strength of the standard cube specimens,temperature field test of pull-out specimen and pull-out test between rebar and concrete were tested immediately. The influence of high temperature on concrete compressive strength and tensile splitting strength are studied systematically. According to the temperature field test results,a simplified test method for the pull-out test between reinforcing bar and concrete under high temperature is proposed. The degradation law of bond behavior between rebar and concrete under elevated temperature is investigated. A bond-slip constitutive model with considering the influence of temperature on bond strength,slip and failure states is proposed based on Harajli Model. The experimental results show that the strength of concrete and the bond strength between steel bar and concrete under high temperature decline with increasing temperaturegenerally,with a steep reduction at 100 ℃. The variation trend of bond strength under high temperature is similar to the tensile strength of concrete. A bond-slip constitutive model between steel bar and concrete under high temperature is proposed.
引文
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[3]Ergün A,KürklüG,Ba爧pnar M S.The effects of material properties on bond strength between reinforcing bar and concrete exposed to high temperature[J].Construction&Building Materials,2016,112:691-698.
[4]肖建庄,黄均亮,赵勇.高温后高性能混凝土和细晶粒钢筋间粘结性能[J].同济大学学报自然科学版,2009,37(10):1296-1301.
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[6]肖遥,汪基伟,冷飞.适用于有限元片状裂缝模型的钢筋与混凝土粘结滑移关系[J].水利水电技术,2016,47(4):28-32+37.
[7]Wu Y F,Zhao X M.Unified bond stress-slip model for reinforced concrete[J].Journal of Structural Engineering,2013,139(11):1951-1962.
[8]Harajli M,Hamad B,Karam K.Bond-slip response of reinforcing bars embedded in plain and fiber concrete[J].Journal of Materials in CivilEngineering,2002,14(6):503-511.
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[11]袁广林,郭操,李庆涛,等.高温后冷却环境对钢筋混凝土黏结性能的损伤[J].中国矿业大学学报,2005,34(5):605-608.
[12]袁广林,郭操,吕志涛.高温下钢筋混凝土粘结性能的试验与分析[J].工业建筑,2006,36(2):57-60.
[13]Diederichs U,Schneider U.Bond strength at high temperatures[J].Magazine of Concrete Research,1981,33(115):75-84.
[14]王海涛,王朝阳,霍静思,等.一种可消除高温影响的钢筋与混凝土拉拔试验装置[P].ZL2017106079843,2017.
[15]霍静思,王鹏,禹琦.水灰比对高温下混凝土力学性能影响试验研究[J].安全与环境学报,2013,13(4):199-206.
[16]王孔藩,许清风,刘挺林.高温下及高温冷却后混凝土力学性能的试验研究[J].施工技术,2005,34(8):3-5.
[17]李卫,过镇海.高温下砼的强度和变形性能试验研究[J].建筑结构学报,1993,14(1):8-16.
[18]Huo J,Jin B,Yu Q,et al.Effect of microstructure variation on damage evolution of concrete at high temperatures[J].Aci Materials Journal,2016,113(5):547-558.
[19]金宝,霍静思.钙质骨料混凝土抗压强度的高温损伤机理[J].建筑材料学报,2016,19(2):359-363.
[20]过镇海.钢筋混凝土原理[M].北京:清华大学出版社,2013:26-28.
[21]Harajli M H.Effect of confinement of bond strength between steel bars and concrete[J].Aci Structural Journal,2004,101(5):595-603.
[2]吴昊,陈礼刚.高温后钢筋混凝土粘结性能试验研究[J].工业建筑,2010,40(2):105-108.
[3]Ergün A,KürklüG,Ba爧pnar M S.The effects of material properties on bond strength between reinforcing bar and concrete exposed to high temperature[J].Construction&Building Materials,2016,112:691-698.
[4]肖建庄,黄均亮,赵勇.高温后高性能混凝土和细晶粒钢筋间粘结性能[J].同济大学学报自然科学版,2009,37(10):1296-1301.
[5]徐有邻.变形钢筋-混凝土粘结锚固性能的试验研究[D].北京:清华大学,1990.
[6]肖遥,汪基伟,冷飞.适用于有限元片状裂缝模型的钢筋与混凝土粘结滑移关系[J].水利水电技术,2016,47(4):28-32+37.
[7]Wu Y F,Zhao X M.Unified bond stress-slip model for reinforced concrete[J].Journal of Structural Engineering,2013,139(11):1951-1962.
[8]Harajli M,Hamad B,Karam K.Bond-slip response of reinforcing bars embedded in plain and fiber concrete[J].Journal of Materials in CivilEngineering,2002,14(6):503-511.
[9]Arel H爦.Effect of different parameters on concrete-bar bond under high temperature[J].Aci Materials Journal,2014,111(6):633-639.
[10]Bing9l A F,Gül R.Residual bond strength between steel bars and concrete after elevated temperatures[J].Fire Safety Journal,2009,44(6):854-859.
[11]袁广林,郭操,李庆涛,等.高温后冷却环境对钢筋混凝土黏结性能的损伤[J].中国矿业大学学报,2005,34(5):605-608.
[12]袁广林,郭操,吕志涛.高温下钢筋混凝土粘结性能的试验与分析[J].工业建筑,2006,36(2):57-60.
[13]Diederichs U,Schneider U.Bond strength at high temperatures[J].Magazine of Concrete Research,1981,33(115):75-84.
[14]王海涛,王朝阳,霍静思,等.一种可消除高温影响的钢筋与混凝土拉拔试验装置[P].ZL2017106079843,2017.
[15]霍静思,王鹏,禹琦.水灰比对高温下混凝土力学性能影响试验研究[J].安全与环境学报,2013,13(4):199-206.
[16]王孔藩,许清风,刘挺林.高温下及高温冷却后混凝土力学性能的试验研究[J].施工技术,2005,34(8):3-5.
[17]李卫,过镇海.高温下砼的强度和变形性能试验研究[J].建筑结构学报,1993,14(1):8-16.
[18]Huo J,Jin B,Yu Q,et al.Effect of microstructure variation on damage evolution of concrete at high temperatures[J].Aci Materials Journal,2016,113(5):547-558.
[19]金宝,霍静思.钙质骨料混凝土抗压强度的高温损伤机理[J].建筑材料学报,2016,19(2):359-363.
[20]过镇海.钢筋混凝土原理[M].北京:清华大学出版社,2013:26-28.
[21]Harajli M H.Effect of confinement of bond strength between steel bars and concrete[J].Aci Structural Journal,2004,101(5):595-603.
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