冻融损伤混凝土与光圆钢筋黏结本构关系试验研究
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摘要
为了研究冻融损伤混凝土与光圆钢筋黏结本构关系,对三种强度等级混凝土试件分别开展了快速冻融循环试验及拉拔试验,得到了不同强度等级、不同冻融循环次数下混凝土的抗压强度及其与光圆钢筋的黏结-滑移曲线。试验结果表明,不同强度等级及不同冻融循环次数的混凝土与光圆钢筋黏结-滑移曲线形状类似;对于相同强度等级试件,随着冻融循环次数的增加,峰值黏结强度、残余黏结强度和初始黏结刚度不断降低而峰值滑移不断增大;对于遭受相同冻融循环次数试件,混凝土强度等级越高,峰值黏结强度和残余黏结强度也越高,而峰值滑移变化规律不明显。最后建立了冻融损伤混凝土与光圆钢筋的黏结-滑移本构模型。上述结果对寒冷地区钢筋混凝土结构性能评定有参考价值。
In order to study the bond-slip constitutive relationship between freeze-thaw damaged concrete and plain round bar, rapid freeze-thaw cycle experiment and pull-out experiment were carried out respectively, for concrete specimens with three kinds of strength grade. The compressive strength of concrete with different strength grades and different freeze-thaw cycles and the bond-slip curve with the plain round bar are also obtained. Experimental results show that the bond-slip curves of concrete with different strength grades are similar to those that subjected to different freeze-thaw cycles of plain round bar. With the increase of freeze-thaw cycles, the bond strength, the remaining bond strength and the initial bond stiffness decrease whereas the ultimate slip increases for the specimens with the same concrete strength grade, moreover with regard to the specimens subjected to the same freeze-thaw cycles, the bond strength and the remaining bond strength increase accompanied by the increase of concrete strength grade. A bond stress-slip relation for plain round bar in frost-damaged concrete has been proposed, which can provide a reference to the performance evaluation of reinforced concrete structure in cold area.
In order to study the bond-slip constitutive relationship between freeze-thaw damaged concrete and plain round bar, rapid freeze-thaw cycle experiment and pull-out experiment were carried out respectively, for concrete specimens with three kinds of strength grade. The compressive strength of concrete with different strength grades and different freeze-thaw cycles and the bond-slip curve with the plain round bar are also obtained. Experimental results show that the bond-slip curves of concrete with different strength grades are similar to those that subjected to different freeze-thaw cycles of plain round bar. With the increase of freeze-thaw cycles, the bond strength, the remaining bond strength and the initial bond stiffness decrease whereas the ultimate slip increases for the specimens with the same concrete strength grade, moreover with regard to the specimens subjected to the same freeze-thaw cycles, the bond strength and the remaining bond strength increase accompanied by the increase of concrete strength grade. A bond stress-slip relation for plain round bar in frost-damaged concrete has been proposed, which can provide a reference to the performance evaluation of reinforced concrete structure in cold area.
引文
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[15] 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))
[16] 冀晓东,宋玉普.钢筋与混凝土黏结性能冻融破坏的力学分析[J].水利学报,2009,40(12):1495-1499 (JI Xiaodong,SONG Yupu.Mechanic analysis on the failure of bond behavior between concrete and steel bar when suffered from frost injury[J].Journal of Hydraulic Engineering,2009,40(12):1495-1499 (in Chinese))
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[19] Verderame G M,Ricci P,Carlo G D,et al.Cyclic bond behaviour of plain bars.Part I:Experimental investigation[J].Construction & Building Materials,2009,23(12):3499-3511.
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[22] Rabbat B G,Russell H G.Friction coefficient of steel on concrete or grout[J].Journal of Structural Engineering,ASCE,1985,111(3):505-515.
[23] Xiao J,Falkner H.Bond behaviour between recycled aggregate concrete and steel rebars[J].Construction & Building Materials,2007,21(2):395-401.
[24] Verderame G M,Carlo G D,Ricci P,et al.Cyclic bond behaviour of plain bars.Part II:Analytical investigation[J].Construction & Building Materials,2009,23(12):3512-3522.
[25] Marti-Vargas J R.Bond behavior of plain round bars in concrete under complex lateral pressures[J].Aci Structural Journal,2014,111(6):1509-1511.
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[27] Cosenza E,Manfredi G,Realfonzo R.Behavior and modeling of bond of FRP rebars to concrete[J].Canadian Metallurgical Quarterly,1997,1(2):40-51.
[2] Shang H S,Song Y P.Experimental study of strength and deformation of plain concrete under biaxial compression after freezing and thawing cycles[J].Cement & Concrete Research,2006,36(10):1857-1864.
[3] 田威,邢凯,谢永利.冻融环境下混凝土损伤劣化机制的力学试验研究[J].实验力学,2015,30(3):299-304 (TIAN Wei,XING Kai,XIE Yongli.Experimental study of damage degradation mechanism of concrete in freeze-thaw environment[J].Journal of Experiment Mechanics,2015,30(3):299-304 (in Chinese))
[4] 宋玉普,于长江,覃丽坤,等.冻融环境下混凝土双向受压强度与变形特性试验研究[J].大连理工大学学报,2004,44(4):545-549 (SONG Yupu,YU Changjiang,TAN Likun,et al.Experimental study of strength and deformation of concrete under biaxial compression in freezing-thawing circumstance[J].Journal of Dalian University of Technology,2004,44(4):545-549 (in Chinese))
[5] Shih T S,Lee G C,Chang K C.Effect of freezing cycles on bond strength of concrete[J].Journal of Structural Engineering,1988,114(3):717-726.
[6] Xu S,Li A,Wang H.Bond properties for deformed steel bar in frost-damaged concrete under monotonic and reversed cyclic loading[J].Construction & Building Materials,2017,148:344-358.
[7] Hanjari K Z,Utgenannt P,Lundgren K.Experimental study of the material and bond properties of frost-damaged concrete[J].Cement & Concrete Research,2011,41(3):244-254.
[8] JI Xiaodong,SONG Yupu,LIU Yuan.Effect of freeze-thaw cycles on bond strength between steel bars and concrete[J].Journal of Wuhan University of Technology,2008,23(4):584-588.
[9] Petersen L.Influence of freezing-and-thawing damage on behavior of reinforced concrete elements[J].Aci Materials Journal,2007,104(4):369-378.
[10] 王青,卫军,徐港,等.冻融环境下变形钢筋与混凝土间黏结应力计算模型[J].水利水电科技进展,2013,33(1):33-36 (WANG Qing,WEI Jun,XU Gang,et al.A model of calculating bond strength between deformed bar and concrete in freeze-thaw environment[J].Advance in Science and Technology of Water Resources,2013,33(1):33-36 (in Chinese))
[11] 赵娟,邹超英,王文博,等.冻融作用后钢筋与混凝土之间粘结性能研究[J].沈阳建筑大学学报(自然科学版),2007,23(5):719-722 (ZHAO Juan,ZOU Chaoying,WANG Wenbo,et al.Study on bonding property between steel bars and concrete caused by freeze thaw action[J].Journal of Shenyang Jianzhu University:Natural Science,2007,23(5):719-722 (in Chinese))
[12] 牛建刚,郝吉,李伯潇.冻融环境下钢筋与粉煤灰混凝土的粘结性能[J].土木建筑与环境工程,2015,37(6):7-14 (NIU Jiangang,HAO Ji,LI Boxiao.Bonding properties between reinforcement and fly ash concrete under freeze-thaw cycle[J].Journal of Civil,Architectural & Environmental Engineering,2015,37(6):7-14 (in Chinese))
[13] 王玉田,姜福香,赵铁军,等.冻融循环下 CFRP 高性能混凝土的粘结性能[J].土木建筑与环境工程,2015,37(2):85-91 (WANG Yutian,JIANG Fuxiang,ZHAO Tiejun,et al.Bond properties of CFRP-high performance concrete subjected to freeze-thaw cycles[J].Journal of Civil,Architectural & Environmental Engineering,2015,37(2):85-91 (in Chinese))
[14] 商怀帅,李玉朋,王晓明,等.冻融后引气再生混凝土与钢筋黏结性能的试验研究[J].混凝土,2015,32(9):27-30 (SHANG Huaishuai,LI Yupeng,WANG Xiaoming,et al.Experimental study on bond behavior of recycled aggregate concrete and reinforced bar after freezing-thawing cycles[J].Concrete,2015,32(9):27-30 (in Chinese))
[15] 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))
[16] 冀晓东,宋玉普.钢筋与混凝土黏结性能冻融破坏的力学分析[J].水利学报,2009,40(12):1495-1499 (JI Xiaodong,SONG Yupu.Mechanic analysis on the failure of bond behavior between concrete and steel bar when suffered from frost injury[J].Journal of Hydraulic Engineering,2009,40(12):1495-1499 (in Chinese))
[17] GB 50119-2003,混凝土外加剂应用技术规范[S].北京:中国建筑工业出版社,2003 (GB 50119-2003,Code for utility technical of concrete admixture[S].Beijing:China Architecture & Building Press,2003 (in Chinese))
[18] GB/T50082-2009,普通混凝土长期性能和耐久性能试验方法[S].北京:中国建筑工业出版社,2009 (GB/T50082-2009,Standard of test method for long term performance and durability of ordinary concrete[J].Beijing:China Architecture & Building Press,2009 (in Chinese))
[19] Verderame G M,Ricci P,Carlo G D,et al.Cyclic bond behaviour of plain bars.Part I:Experimental investigation[J].Construction & Building Materials,2009,23(12):3499-3511.
[20] Abrams D A.Tests of bond between concrete and steel[R].University of Illinois No.503,University of Illinois at Urbana-Champaign,Urbana,IL,1913.
[21] Stocker M F,Sozen M A.Investigation of prestressed reinforced concrete for highway bridges.Part V,bond characteristics of prestressing strand[R].University of Illinois No.71,University of Illinois at Urbana-Champaign,Urbana,IL,1970.
[22] Rabbat B G,Russell H G.Friction coefficient of steel on concrete or grout[J].Journal of Structural Engineering,ASCE,1985,111(3):505-515.
[23] Xiao J,Falkner H.Bond behaviour between recycled aggregate concrete and steel rebars[J].Construction & Building Materials,2007,21(2):395-401.
[24] Verderame G M,Carlo G D,Ricci P,et al.Cyclic bond behaviour of plain bars.Part II:Analytical investigation[J].Construction & Building Materials,2009,23(12):3512-3522.
[25] Marti-Vargas J R.Bond behavior of plain round bars in concrete under complex lateral pressures[J].Aci Structural Journal,2014,111(6):1509-1511.
[26] Eligehausen R,Popov E,Bertero V V.Local bond stress-slip relationships of deformed bars under generalized excitations[D].EERC University of California Berkeley.report No.UCB/EER 83-23,1983.
[27] Cosenza E,Manfredi G,Realfonzo R.Behavior and modeling of bond of FRP rebars to concrete[J].Canadian Metallurgical Quarterly,1997,1(2):40-51.