锈蚀钢筋混凝土柱的修正压-剪-弯分析模型研究
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摘要
随着服役时间的增加,混凝土结构中钢筋易发生锈蚀,引起混凝土结构承载性能下降,严重影响工程结构的继续使用。该文在分析纵筋锈蚀后的屈曲效应、箍筋锈蚀后的约束效应、混凝土和钢筋材料性能劣化的基础上,建议了考虑锈蚀影响的钢筋、混凝土及锈蚀钢筋与混凝土界面粘结性能的本构模型,以锈蚀钢筋混凝土柱为研究对象,对反复荷载作用下钢筋混凝土柱的分析模型进行修正,建立了锈蚀钢筋混凝土柱压-剪-弯交互作用下极限承载力计算模型,并通过21根锈蚀混凝土柱的试验结果对建议分析模型进行了验证。研究结果表明:锈蚀钢筋混凝土柱极限承载力试验值与计算值之比的平均值为1.021,方差为0.014,建议模型极限承载力预测值与试验结果吻合较好,可用于低周反复荷载作用下锈蚀钢筋混凝土柱的承载力分析。
With the increasing of their service life, the steel reinforcements in concrete structures are prone to corrosion, which causes the bearing capacity degradation of a concrete structure. Therefore, the corrosion of reinforcing bars greatly affects the use of concrete structures. Based on analyzing the effect of corroded steel reinforcement on buckling, the confinement effect of corroded stirrup and degradation of mechanical properties of concrete and steel, the constitutive models of these materials including steel and concrete along with the bond behaviour between the steel bars and concrete were proposed in many literatures. By selecting the corroded reinforced concrete columns as the research object, an analytical model of peak lateral load capacity of corroded reinforced concrete columns under axial-shear-flexure loading was put forward by modifying the analysis model of reinforced concrete columns subjected to cyclic loading. The proposed model was verified through 21 corroded columns tests. It is believed that a good agreement between test results and prediction results for lateral load capacity is achieved with an average ratio of test results to predicted results of 1.021 and a variance of 0.014 between test results and predicted results. The suggested model can be served as a theoretical method to analyse the load bearing capacity of corroded reinforced concrete columns under cyclic loading.
With the increasing of their service life, the steel reinforcements in concrete structures are prone to corrosion, which causes the bearing capacity degradation of a concrete structure. Therefore, the corrosion of reinforcing bars greatly affects the use of concrete structures. Based on analyzing the effect of corroded steel reinforcement on buckling, the confinement effect of corroded stirrup and degradation of mechanical properties of concrete and steel, the constitutive models of these materials including steel and concrete along with the bond behaviour between the steel bars and concrete were proposed in many literatures. By selecting the corroded reinforced concrete columns as the research object, an analytical model of peak lateral load capacity of corroded reinforced concrete columns under axial-shear-flexure loading was put forward by modifying the analysis model of reinforced concrete columns subjected to cyclic loading. The proposed model was verified through 21 corroded columns tests. It is believed that a good agreement between test results and prediction results for lateral load capacity is achieved with an average ratio of test results to predicted results of 1.021 and a variance of 0.014 between test results and predicted results. The suggested model can be served as a theoretical method to analyse the load bearing capacity of corroded reinforced concrete columns under cyclic loading.
引文
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[14]Park R L,Park R,Paulay T.Reinforced concrete structures[M].New York:John Wiley&Sons,1975.
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[22]Molina F J,Alonso C,Andrade C.Cover cracking as a function of rebar corrosion:Part 2-Numerical model[J].Materials&Structures,1993,26(9):532―548.
[23]Mander J B,Priestley M J N,Park R.Theoretical stress-strain model for confined concrete[J].ASCEJournal of Structural Engineering,1988,114(8):1804―1826.
[24]El-Maaddawy T,Soudki K,Topper T.Analytical model to predict nonlinear flexural behavior of corroded reinforced concrete beams[J].ACI structural journal,2005,102(4):550―559.
[25]Vecchio F J,Collins M P.The modified compression field theory for reinforced concrete elements subjected to shear[J].ACI Structural Journal,1986,83(2):219―231.
[26]Mostafaei H,Kabeyasawa T.Axial-shear-flexure interaction approach for reinforced concrete columns[J].ACI Structural Journal,2007,104(2):218―226.
[27]Walraven J C.Fundamental analysis of aggregate interlock[J].ASCE Journal of the Structural Division,1981,107(11):2245―2270.
[28]Ou Y C,Nguyen N D.Modified axial-shear-flexure interaction approaches for uncorroded and corroded reinforced concrete beams[J].Engineering Structures,2016,128:44―54.
[29]史庆轩,牛荻涛,颜桂云.反复荷载作用下锈蚀钢筋混凝土压弯构件恢复力性能的试验研究[J].地震工程与工程振动,2000,20(4):44―50.Shi Qingxuan,Niu Ditao,Yan Guiyun.Experimental research on hysteretic characteristics of corroded RCmembers with flexural and compressive axial loads under repeated horizontal loading[J].Earthquake Engineering and Engineering Dynamics,2000,20(4):44―50.(in Chinese)
[30]牛荻涛,陈新孝,王学民.锈蚀钢筋混凝土压弯构件抗震性能试验研究[J].建筑结构,2004,34(10):36-38.Niu Ditao,Chen Xinxiao,Wang Xuemin.Experimental study on seismic performance of corroded reinforced concrete members with flexure and compression[J].Building Structures,2004,34(10):36―38.(in Chinese)
[31]Goksu C.Seismic behavior of RC columns with corroded plain and deformed reinforcing bars[D].Turkey:Istanbul Technical University,2012.
[2]郑山锁,刘巍,左河山,等.近海大气环境下考虑锈蚀的不同剪跨比RC框架梁抗震性能试验[J].工程力学,2018,35(4):78―86.Zheng Shansuo,Liu Wei,Zuo Heshan,et al.Aseismic performance test of RC frame beams considering corrosion with different shear span ratio in the coastal atmosphere[J].Engineering Mechanics,2018,35(4):78―86.(in Chinese)
[3]Ye Z,Zhang W,Gu X.Deterioration of shear behavior of corroded reinforced concrete beams[J].Engineering Structures,2018,168:708―720.
[4]张昊宇,王涛,林旭川,等.尼泊尔8.1级地震钢筋混凝土框架典型震害及讨论[J].工程力学,2016,33(9):59―68.Zhang Haoyu,Wang Tao,Lin Xuchuan,et al.Seismic damages of RC frames in Nepal MS 8.1 earthquake[J].Engineering Mechanics,2016,33(9):59―68.(in Chinese)
[5]Meda A,Mostosi S,Rinaldi Z,et al.Experimental evaluation of the corrosion influence on the cyclic behaviour of RC columns[J].Engineering Structures,2014,76:112―123.
[6]Lee H S,Kage T,Noguchi T,et al.An experimental study on the retrofitting effects of reinforced concrete columns damaged by rebar corrosion strengthened with carbon fiber sheets[J].Cement&Concrete Research,2003,33(4):563―570.
[7]Ou Y C,Fan H D,Nguyen N D.Long-term seismic performance of reinforced concrete bridges under steel reinforcement corrosion due to chloride attack[J].Earthquake Engineering&Structural Dynamics,2013,42(14):2113―2127.
[8]Vu N S,Yu B,Li B.Prediction of strength and drift capacity of corroded reinforced concrete columns[J].Construction&Building Materials,2016,115:304―318.
[9]Choe D E,Gardoni P,Rosowsky D,et al.Probabilistic capacity models and seismic fragility estimates for RCcolumns subject to corrosion[J].Reliability Engineering&System Safety,2008,93(3):383―393.
[10]邢国华,罗大明,牛荻涛.锈蚀钢筋混凝土柱的强度-变形分析模型[J].地震工程与工程振动,2016,36(1):91―100.Xing Guohua,Luo Daming,Niu Ditao.Deformation capacity model of corroded reinforced concrete columns[J].Earthquake Engineering and Engineering Dynamics,2016,36(1):91―100.(in Chinese)
[11]Du Y G,Clark L A,Chan A H C.Effect of corrosion on ductility of reinforcing bars[J].Magazine of Concrete Research,2005,57(7):407―419.
[12]Ou Y C,Susanto Y T T,Roh H.Tensile behavior of naturally and artificially corroded steel bars[J].Construction and Building Materials,2016,103:93―104.
[13]Fernandez I,Bairán J M,MaríA R.Corrosion effects on the mechanical properties of reinforcing steel bars.Fatigue and behavior[J].Construction&Building Materials,2015,101:772―783.
[14]Park R L,Park R,Paulay T.Reinforced concrete structures[M].New York:John Wiley&Sons,1975.
[15]Sezen H,Setzler E J.Reinforcement slip in reinforced concrete columns[J].ACI Structural Journal,2008,105(3):280―289.
[16]Clark L A,Chan A H C,Du Y G.Residual capacity of corroded reinforcing bars[J].Magazine of Concrete Research,2005,57(3):135―147.
[17]Dhakal R P,Maekawa K.Path-dependent cyclic stressstrain relationship of reinforcing bar including buckling[J].Engineering Structures,2002,24(11):1383―1396.
[18]Kashani M M,Crewe A J,Alexander N A.Nonlinear stress-strain behaviour of corrosion-damaged reinforcing bars including inelastic buckling[J].Engineering Structures,2013,48:417―429.
[19]Dhakal R P,Maekawa K.Reinforcement stability and fracture of cover concrete in reinforced concrete members[J].Journal of Structural Engineering,2002,128(10):1253―1262.
[20]Kearsley E,Joyce A.Effect of corrosion products on bond strength and flexural behaviour of reinforced concrete slabs[J].Journal of the South African Institution of Civil Engineers,2014,56(2):21―29.
[21]Coronelli D,Gambarova P.Structural assessment of corroded reinforced concrete beams:modeling guidelines[J].ASCE Journal of Structural Engineering,2004,130(8):1214―1224.
[22]Molina F J,Alonso C,Andrade C.Cover cracking as a function of rebar corrosion:Part 2-Numerical model[J].Materials&Structures,1993,26(9):532―548.
[23]Mander J B,Priestley M J N,Park R.Theoretical stress-strain model for confined concrete[J].ASCEJournal of Structural Engineering,1988,114(8):1804―1826.
[24]El-Maaddawy T,Soudki K,Topper T.Analytical model to predict nonlinear flexural behavior of corroded reinforced concrete beams[J].ACI structural journal,2005,102(4):550―559.
[25]Vecchio F J,Collins M P.The modified compression field theory for reinforced concrete elements subjected to shear[J].ACI Structural Journal,1986,83(2):219―231.
[26]Mostafaei H,Kabeyasawa T.Axial-shear-flexure interaction approach for reinforced concrete columns[J].ACI Structural Journal,2007,104(2):218―226.
[27]Walraven J C.Fundamental analysis of aggregate interlock[J].ASCE Journal of the Structural Division,1981,107(11):2245―2270.
[28]Ou Y C,Nguyen N D.Modified axial-shear-flexure interaction approaches for uncorroded and corroded reinforced concrete beams[J].Engineering Structures,2016,128:44―54.
[29]史庆轩,牛荻涛,颜桂云.反复荷载作用下锈蚀钢筋混凝土压弯构件恢复力性能的试验研究[J].地震工程与工程振动,2000,20(4):44―50.Shi Qingxuan,Niu Ditao,Yan Guiyun.Experimental research on hysteretic characteristics of corroded RCmembers with flexural and compressive axial loads under repeated horizontal loading[J].Earthquake Engineering and Engineering Dynamics,2000,20(4):44―50.(in Chinese)
[30]牛荻涛,陈新孝,王学民.锈蚀钢筋混凝土压弯构件抗震性能试验研究[J].建筑结构,2004,34(10):36-38.Niu Ditao,Chen Xinxiao,Wang Xuemin.Experimental study on seismic performance of corroded reinforced concrete members with flexure and compression[J].Building Structures,2004,34(10):36―38.(in Chinese)
[31]Goksu C.Seismic behavior of RC columns with corroded plain and deformed reinforcing bars[D].Turkey:Istanbul Technical University,2012.