锈蚀率对钢筋混凝土梁黏结滑移性能影响的试验研究
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摘要
建立了锈蚀钢筋混凝土梁中钢筋与混凝土之间黏结滑移数值分析模型,设计制作了14根不同剪跨比与锈蚀率的钢筋混凝土梁,采用ANSYS有限元软件建立了锈蚀钢筋混凝土梁的三维有限元模型,对14根钢筋混凝土梁开展极限承载力试验,从锈蚀钢筋混凝土梁的荷载-跨中挠度曲线、极限承载力以及钢筋与混凝土之间黏结力3个方面开展对比分析研究,结果表明锈蚀钢筋混凝土梁的荷载-跨中挠度曲线均可大致分为弹性和塑性两个阶段,随着锈蚀率变大,弹性阶段与塑性阶段的分界逐渐不明显。锈蚀钢筋与混凝土之间的黏结力随着距离跨中截面距离的增大变大,且最大黏结力位置出现于加载点附近,同级荷载下,最大黏结力随着锈蚀率的增加而减小。锈蚀钢筋混凝土梁极限承载力随着锈蚀率和剪跨比的增加而变小,当剪跨比为3.0时,平均每升高1%锈蚀率,极限承载力试验值降低1.002 k N,当剪跨比为2.4时,平均每升高1%锈蚀率,极限承载力试验值降低1.849 k N。
Numerical analysis model of the bond-slip relationship between reinforcement and concrete were established in corroded reinforced concrete beams.14 reinforced concrete beams with different shear span ratios and corrosion rates were designed and made,three-dimensional finite element model of the corroded reinforced concrete beams were established by ANSYS finite element software,the ultimate bearing capacity experiment of 14 corroded reinforced concrete beams were carried out,the experimental results were compared from three aspects,load-deflection curves,ultimate bearing capacity and cohesive force between reinforcement and concrete.The results show that the load deflection curve of corroded reinforced concrete beams can be divided into elasticity stage and plasticity stage,with the increase of corrosion rate,the boundary between elastic stage and plastic stage got less obvious.The bond force between corroded reinforcement and concrete get bigger with the increase of distance from middle cross section,the maximum bond force appeared near loading point,and the maximum bond force decreased with the increase of corrosion rate under the same load level.The ultimate bearing capacity of corroded reinforced concrete beams decreased with the increase of corrosion rate and shear span ratio,when shear span ratio was 3.0,the ultimate bearing capacity decreased by 1.002 k N with an average increase of 1% corrosion rate.When shear span ratio was 2.4,the ultimate bearing capacity decreased by 1.849 k N with an average increase of 1% corrosion rate.
Numerical analysis model of the bond-slip relationship between reinforcement and concrete were established in corroded reinforced concrete beams.14 reinforced concrete beams with different shear span ratios and corrosion rates were designed and made,three-dimensional finite element model of the corroded reinforced concrete beams were established by ANSYS finite element software,the ultimate bearing capacity experiment of 14 corroded reinforced concrete beams were carried out,the experimental results were compared from three aspects,load-deflection curves,ultimate bearing capacity and cohesive force between reinforcement and concrete.The results show that the load deflection curve of corroded reinforced concrete beams can be divided into elasticity stage and plasticity stage,with the increase of corrosion rate,the boundary between elastic stage and plastic stage got less obvious.The bond force between corroded reinforcement and concrete get bigger with the increase of distance from middle cross section,the maximum bond force appeared near loading point,and the maximum bond force decreased with the increase of corrosion rate under the same load level.The ultimate bearing capacity of corroded reinforced concrete beams decreased with the increase of corrosion rate and shear span ratio,when shear span ratio was 3.0,the ultimate bearing capacity decreased by 1.002 k N with an average increase of 1% corrosion rate.When shear span ratio was 2.4,the ultimate bearing capacity decreased by 1.849 k N with an average increase of 1% corrosion rate.
引文
[1]梁超锋,刘铁军,肖建庄,等.钢筋及其锈蚀对混凝土构件阻尼的影响[J].工程力学,2017,34(3):101-107.
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[13]赵卓,曾力,王飞,等.锈蚀钢筋混凝土梁受弯承载力与失效模式研究[J].建筑结构,2017,47(17):88-92+65.
[14]NILSON A H.Internal measurement of bond slip[J].ACI Journal,Proceedings,1972,69(7):439-441.
[15]TENG Z M,ZHANG H Q.Experimental study of splitting bond failure and development of reinforcing bars in beams[J].Tsinghua University,1998.
[16]袁迎曙,贾福萍,蔡跃.锈蚀钢筋的力学性能退化研究[J].工业建筑,2000,30(1):43-46.
[17]袁迎曙,余索,贾福萍.锈蚀钢筋混凝土的黏结性能退化的试验研究[J].工业建筑,1999(11):47-50.
[18]袁迎曙,贾福萍,蔡跃.锈蚀钢筋混凝土梁的结构性能退化模型[J].土木工程学报,2001(3):47-52,96.
[19]混凝土结构设计规范:GB 500100-2002[S].北京:中国建筑工业出版社,2002.
[2]成虎,李宏男,王东升,等.考虑锈蚀黏结退化的钢筋混凝土桥墩抗震性能分析[J].工程力学,2017,34(12):48-58.
[3]梁岩,李杰,罗小勇,等.锈蚀钢筋混凝土构件抗震动力性能研究[J].振动工程学报,2016,29(1):140-147.
[4]张誉,蒋利学,张伟平.混凝土结构耐久性概论[M].上海:上海科学技术出版社,2003.
[5]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.
[6]KEMP E L,BREZNY F S,UNTERSPAN J A.Effect of rust and scale on the bond characteristics of deformed reinforcing bars[J].Am concrete Inst Journal&Proceedings,1968.
[7]陈朝晖,谭东阳,曾宇,等.锈蚀钢筋混凝土黏结强度试验[J].重庆大学学报,2016,39(1):79-87.
[8]杨晓明,孙国君,陈永林,等.锈蚀钢筋混凝土梁中钢筋与混凝土间黏结性能退化分析[J].硅酸盐通报,2017,36(4):1388-1394.
[9]郭诗惠,刘炳.锈蚀钢筋混凝土梁抗弯承载力计算与分析[J].建筑结构,2017,47(4):44-48.
[10]董卫,苏志敏,杨华舒,等.箍筋锈蚀对钢筋混凝土梁承载机理影响的试验研究[J].建筑结构,2016,46(6):86-90.
[11]杨晓明,王耀耀,陈永林,等.局部锈蚀对钢筋混凝土梁承载性能的影响[J].硅酸盐通报,2016,35(8):2365-2370,2377.
[12]薛昕,杨成.纵向受拉钢筋锈蚀钢筋混凝土梁的抗剪性能[J].上海交通大学学报,2016,50(11):1767-1772.
[13]赵卓,曾力,王飞,等.锈蚀钢筋混凝土梁受弯承载力与失效模式研究[J].建筑结构,2017,47(17):88-92+65.
[14]NILSON A H.Internal measurement of bond slip[J].ACI Journal,Proceedings,1972,69(7):439-441.
[15]TENG Z M,ZHANG H Q.Experimental study of splitting bond failure and development of reinforcing bars in beams[J].Tsinghua University,1998.
[16]袁迎曙,贾福萍,蔡跃.锈蚀钢筋的力学性能退化研究[J].工业建筑,2000,30(1):43-46.
[17]袁迎曙,余索,贾福萍.锈蚀钢筋混凝土的黏结性能退化的试验研究[J].工业建筑,1999(11):47-50.
[18]袁迎曙,贾福萍,蔡跃.锈蚀钢筋混凝土梁的结构性能退化模型[J].土木工程学报,2001(3):47-52,96.
[19]混凝土结构设计规范:GB 500100-2002[S].北京:中国建筑工业出版社,2002.