地震荷载作用下FRP用量对加固RC圆柱变形能力影响研究
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摘要
纤维增强复合材料(FRP)加固钢筋混凝土(RC)圆柱可以有效提高其抗震性能。本文研究地震荷载作用下FRP用量对加固圆柱变形能力的影响。运用数值计算方法对加固柱截面曲率进行计算,发现FRP用量对屈服曲率影响很小,但对极限曲率有显著的影响。试验结果显示,加固柱顶点侧向位移角并不随FRP加固用量的增加一直增加,当FRP用量达到一定值后进一步增加会降低侧向位移角。理论分析表明,这是由于加固柱塑性铰长度也受FRP用量的影响,随着FRP用量的增加塑性铰长度变小。最后讨论了具有良好加固效果的FRP用量上限范围。
Fiber reinforced polymer(FRP) have great efficiency to retrofit circular reinforced concrete(RC) columns under simulated seismic loading.In this paper,the impact of the FRP amount to the deformation capacity of the retrofitted columns is studied.The sectional curvature is calculated with numerical analysis method.It is found the FRP amount has very limited influence to sectional yield curvature,however,the ultimate curvature can be significantly influenced.The test results demonstrate that the ultimate drift ratio does not always increase with an increase of the amount of FPR.The peak of the ultimate drift ratio is attained at a critical value of the amount of FPR,after which the ultimate drift ratio can be decreased with an increase in the amount of FPR.This is because the plastic hinge length of retrofitted columns can also be influenced by the amount of FRP,and it will decrease with an increase of the amount of FRP.Then the upper bound of the amount of FRP for an efficient retrofit is discussed.
Fiber reinforced polymer(FRP) have great efficiency to retrofit circular reinforced concrete(RC) columns under simulated seismic loading.In this paper,the impact of the FRP amount to the deformation capacity of the retrofitted columns is studied.The sectional curvature is calculated with numerical analysis method.It is found the FRP amount has very limited influence to sectional yield curvature,however,the ultimate curvature can be significantly influenced.The test results demonstrate that the ultimate drift ratio does not always increase with an increase of the amount of FPR.The peak of the ultimate drift ratio is attained at a critical value of the amount of FPR,after which the ultimate drift ratio can be decreased with an increase in the amount of FPR.This is because the plastic hinge length of retrofitted columns can also be influenced by the amount of FRP,and it will decrease with an increase of the amount of FRP.Then the upper bound of the amount of FRP for an efficient retrofit is discussed.
引文
[1]吴刚.FRP加固钢筋混凝土结构的试验研究与理论分析[D].南京:东南大学博士论文,2002Wu Gang.Experimental Study and Theoretical Analysison Strengthening Concrete Structures with FRP[D].Nanjing:University of Southeast,2002(in Chinese)
[2]Wu Y F,Liu T,Oehlers D J.Fundamental principlesthat govern retrofitting of reinforced concrete columns bysteel and FRP jacketing[J].Advances in StructuralEngineering,2006,9(4):507～533
[3]吴刚,吕志涛.FRP约束混凝土圆柱无软化段时的应力-应变关系研究[J].建筑结构学报,2003,24(5):1～8Wu Gang,Lv Zhi-tao.Study on the Stress-strainRelationship of FRP-confined Concrete Circular Columnswithout a Strain-softening Response[J].Journal ofBuilding Structures,2003,24(5):1～8(in Chinese)
[4]顾冬生,吴刚,吴智深,等.CFRP加固高轴压比钢筋混凝土短圆柱抗震性能试验研究[J].工程抗震与加固改造,2006,28(6):71～77Gu Dong-sheng,Wu Gang,Wu Zhi-shen,et al.Experimental study on seismic performance of RC shortcircular columns strengthened with CFRP compositesunder high-level compression[J].Earthquake ResistantEngineering and Retrofitting,2006,28(6):71～77(inChinese)
[5]王震宇,芦学磊,李伟,等.塑性铰区碳纤维约束高强混凝土圆柱抗震性能的试验研究[J].建筑结构,2009,39(2):21～24Wang Zhen-yu,Lu Xue-lei,Li Wei,et al.Experimental research on seismic performance of highstrength concrete circular column confined with carbonfiber sheets at plastic hinge zone[J].BuildingStructure,2009,39(2):21～24(in Chinese)
[6]Lei-Ming Wang,Yu-Fei Wu.Effect of corner radius onthe performance of CFRP-confined square concretecolumns:Test[J].Engineering Structures,2008(30):493～505
[7]顾冬生,吴刚,吴智深,等.FRP加固RC圆柱破坏模式及纤维应变特性研究[J].世界地震工程,2008,24(2):60～67Gu Dong-sheng,Wu Gang,Wu Zhi-shen,et al.Research of Failure Modes and Fiber Strain Response ofFRP-Confined RC Circular Columns[J].WorldInformation On Earthquake Engineering,2008,24(2):60～67(in Chinese)
[8]李静,钱稼茹.碳纤维布约束混凝土柱的非线性分析[J].工程力学,2005,22(1):159～163Li Jing,Qian Jia-ru.Nonlinear analysis of carbon fibersheet confined concrete columns[J].EngineeringMechanics,2005,22(1):159～163(in Chinese)
[9]Paultre P,Légeron F.Confinement reinforcement designfor reinforced concrete columns[J].Journal ofStructural Engineering ASCE,2008,134(5):738～749
[10]Lam L,Teng J G.Design-oriented stress-strain modelfor FRP-confined concrete[J].Construction andBuilding Materials,2003,17:471～489
[11]Priestley M J N,Seible F,Calvi M.Seismic design andretrofit of bridges[M].New York:Wiley,1996
[12]Sheikh S A,Yau G.Seismic behavior of concretecolumns confined with steel and fiber-reinforcedpolymers[J].ACI Structural Journal,2002,99(1):72～81
[13]Li Y F,Sung Y Y.A study on the shear-failure ofcircular sectioned bridge column retrofitted by usingCFRP jacketing[J].Journal of reinforced plastics andcomposites,2004,23(8):811～830
[14]Saatcioglu M,Baingo D.Circular high-strength concretecolumns under simulated seismic loading[J].Journal ofStructural Engineering ASCE,1999,125(3):272～280
[15]Elsanadedy H M,Haroun M A.Seismic designguidelines for squat composite-jacketed circular andrectangular reinforced concrete bridge columns[J].ACIStructural Journal,2005,102(4):505～514
[2]Wu Y F,Liu T,Oehlers D J.Fundamental principlesthat govern retrofitting of reinforced concrete columns bysteel and FRP jacketing[J].Advances in StructuralEngineering,2006,9(4):507～533
[3]吴刚,吕志涛.FRP约束混凝土圆柱无软化段时的应力-应变关系研究[J].建筑结构学报,2003,24(5):1～8Wu Gang,Lv Zhi-tao.Study on the Stress-strainRelationship of FRP-confined Concrete Circular Columnswithout a Strain-softening Response[J].Journal ofBuilding Structures,2003,24(5):1～8(in Chinese)
[4]顾冬生,吴刚,吴智深,等.CFRP加固高轴压比钢筋混凝土短圆柱抗震性能试验研究[J].工程抗震与加固改造,2006,28(6):71～77Gu Dong-sheng,Wu Gang,Wu Zhi-shen,et al.Experimental study on seismic performance of RC shortcircular columns strengthened with CFRP compositesunder high-level compression[J].Earthquake ResistantEngineering and Retrofitting,2006,28(6):71～77(inChinese)
[5]王震宇,芦学磊,李伟,等.塑性铰区碳纤维约束高强混凝土圆柱抗震性能的试验研究[J].建筑结构,2009,39(2):21～24Wang Zhen-yu,Lu Xue-lei,Li Wei,et al.Experimental research on seismic performance of highstrength concrete circular column confined with carbonfiber sheets at plastic hinge zone[J].BuildingStructure,2009,39(2):21～24(in Chinese)
[6]Lei-Ming Wang,Yu-Fei Wu.Effect of corner radius onthe performance of CFRP-confined square concretecolumns:Test[J].Engineering Structures,2008(30):493～505
[7]顾冬生,吴刚,吴智深,等.FRP加固RC圆柱破坏模式及纤维应变特性研究[J].世界地震工程,2008,24(2):60～67Gu Dong-sheng,Wu Gang,Wu Zhi-shen,et al.Research of Failure Modes and Fiber Strain Response ofFRP-Confined RC Circular Columns[J].WorldInformation On Earthquake Engineering,2008,24(2):60～67(in Chinese)
[8]李静,钱稼茹.碳纤维布约束混凝土柱的非线性分析[J].工程力学,2005,22(1):159～163Li Jing,Qian Jia-ru.Nonlinear analysis of carbon fibersheet confined concrete columns[J].EngineeringMechanics,2005,22(1):159～163(in Chinese)
[9]Paultre P,Légeron F.Confinement reinforcement designfor reinforced concrete columns[J].Journal ofStructural Engineering ASCE,2008,134(5):738～749
[10]Lam L,Teng J G.Design-oriented stress-strain modelfor FRP-confined concrete[J].Construction andBuilding Materials,2003,17:471～489
[11]Priestley M J N,Seible F,Calvi M.Seismic design andretrofit of bridges[M].New York:Wiley,1996
[12]Sheikh S A,Yau G.Seismic behavior of concretecolumns confined with steel and fiber-reinforcedpolymers[J].ACI Structural Journal,2002,99(1):72～81
[13]Li Y F,Sung Y Y.A study on the shear-failure ofcircular sectioned bridge column retrofitted by usingCFRP jacketing[J].Journal of reinforced plastics andcomposites,2004,23(8):811～830
[14]Saatcioglu M,Baingo D.Circular high-strength concretecolumns under simulated seismic loading[J].Journal ofStructural Engineering ASCE,1999,125(3):272～280
[15]Elsanadedy H M,Haroun M A.Seismic designguidelines for squat composite-jacketed circular andrectangular reinforced concrete bridge columns[J].ACIStructural Journal,2005,102(4):505～514
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