FRP加固钢筋混凝土柱经历模拟地震作用后的残余性能试验研究
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摘要
本文对8根大比例的FRP加固钢筋混凝土桥柱模型在轴压比为0.2的恒定轴压力下进行拟静力试验,再对其中5根试验柱在经历有限的地震作用后进行长期荷载作用下的轴压试验。试验表明,FRP加固柱的徐变变形远小于对比柱的徐变变形;带损伤的加固柱在长期荷载作用下的变形发展受加固柱的损伤程度和持荷大小的控制,并与FRP的弹性模量有关;在试验条件下,带损伤的加固柱长期轴向变形呈稳定态势。采用AEMM和F ind ley模型为基础,考虑损伤程度、密封状态、三向应力状态和应力重分布等因素的影响,建立了损伤加固柱的徐变计算模型,并进行了验证。分析表明,损伤对加固柱的徐变发展和徐变破坏时限有显著影响。
This paper addressed residual seismic behavior of reinforced concrete(RC) columns retrofitted with fiber-reinforced plastic(FRP).Eight model columns were tested under cyclic lateral force with a constant load equal to 20% of the column gross axial load capacity.Five of them were continued to be tested under long-term axial loading.The deformation of retrofitted columns under long-term axial loading depended on the previous damage intensity and the modulus of FRP.Under the testing condition of this study,the long-term axial deformation of retrofitted column tends to be stable.Analytical studies were carried out by using the age-adjusted effective modulus method for creep of concrete,combined with the Findley′s power law function for creep of FRP jacket.The model took the following factors into consideration,namely the effects of damaged degree of earthquake,sealed concrete,multi-axial state of stresses and stress re-distribution.The model was verified against the long-term test in this paper.The analytical results show that degree of damage has important effect on creep and creep rupture life expectancy.
This paper addressed residual seismic behavior of reinforced concrete(RC) columns retrofitted with fiber-reinforced plastic(FRP).Eight model columns were tested under cyclic lateral force with a constant load equal to 20% of the column gross axial load capacity.Five of them were continued to be tested under long-term axial loading.The deformation of retrofitted columns under long-term axial loading depended on the previous damage intensity and the modulus of FRP.Under the testing condition of this study,the long-term axial deformation of retrofitted column tends to be stable.Analytical studies were carried out by using the age-adjusted effective modulus method for creep of concrete,combined with the Findley′s power law function for creep of FRP jacket.The model took the following factors into consideration,namely the effects of damaged degree of earthquake,sealed concrete,multi-axial state of stresses and stress re-distribution.The model was verified against the long-term test in this paper.The analytical results show that degree of damage has important effect on creep and creep rupture life expectancy.
引文
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[3]Xiao Y,Ma R.Seismic retrofit of RC circular columnsusing prefabricated composite jacking[J].Journal ofStructural Engineering,ASCE,1997,123(10):1357-1364.
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[6]Saatcioglu M,Elnabelsy G.Seismic retrofit of bridgecolumns with CFRP jackets[C]//FRP Composites in CivilEngineering.Hong Kong:ELSEVIER,2001:833-838.
[7]Xiao,Y.Applications of FRP composites in concretecolumns[J].International Journal of Advances in StructuralEngineering,2004,7(4):335-344.
[8]岳清瑞.纤维增强塑料(FRP)在土木工程结构中应用技术的进展[C]//第二届全国土木工程用纤维增强塑料复合材料(FRP)应用技术学术交流会论文集.北京:清华大学出版社,2002:243-246.(Yue Q R.Applicationdevelopment of fiber reinforced plastic(FRP)in civilengineering[C]//Proceedings of the Second NationalConference on Application of FRP Technology in CivilEngineering.Beijing:Tsinghua University Press,2002:243-246.(in Chinese))
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[10]ACI Committee 318 Building code requirements forstructural concrete(ACI 318M-02)and commentary(318RM-02)[M].New York:Farmington Hills,Mich.,2002:443-447.
[11]ACI Committee 440 Guide for the design andstrengthening of externally bonded FRP systems forstrengthening concrete structures[S].NewYork:AmericanConcrete Institute,2000.
[12]Park Y J,Ang HS.Mechanistic seismic damage model forreinforced concrete[J].Journal of Structural Engineering,ASCE,1985,111(4):722-739.
[13]王振宇,刘晶波.建筑结构地震损伤评估的研究进展[J].世界地震工程,2001,1(3):43-48.(Wang Z Y,Liu J B.The advances of studies on seismic damageassessment of building structures[J].The Engineering ofWorld Earthquake,2001,1(3):43-48.(in Chinese))
[14]张培新.钢筋混凝土抗震结构非线性分析[M].北京:科学出版社,2003:6-13.(Zhang P X.The nonlinearanalysis of earthquake-resistant reinforced concretestructures[M].Beijing:Science Press,2003:6-13.(inChinese))
[15]Xiao Y,Wu H.Compressive behavior of concrete cylindersconfined by carbon fiber composite jackets[J].Journal ofMaterials in Civil Engineering,ASCE,2000,12(2):139-146.
[16]Bazant Z P.Prediction of concrete creep effects using age-adjusted effective modulus method[J].ACI Journal,1972,69(20):212-217.
[17]Findley W N.Mechanism andmechanics of creep of plastics[J].ACI Journal SPE,1960:57-65.
[18]Jordaan I J,Illston J M.Time-dependent strains in sealsconcrete under multiaxial compressive stress[J].Magazineof Concrete Research,1971,23(75):78-88.
[19]惠荣岩,黄国兴,易冰若.混凝土的徐变[M].北京:中国铁道出版社,1988:42-68.(Hui R Y,Huang G X,Yi BR.Creep of concrete[M].Beijing:China Railway Press,1988:42-68.(in Chinese))
[2]Saadatmanesh h,Ehsani MR,Jin L.Seismic strengtheningof circular bridge pier models with fiber composite straps[J].ACI Structural Journal,1996,93(6):639-647.
[3]Xiao Y,Ma R.Seismic retrofit of RC circular columnsusing prefabricated composite jacking[J].Journal ofStructural Engineering,ASCE,1997,123(10):1357-1364.
[4]Xiao Y,Wu H,Martin R.Prefabricated compositejacketing of RC columns for enhanced shear strength[J].Journal of Structural Engineering,ASCE,1999,125(3):255-264.
[5]Xiao Y,Sheikh S A,Li Z X.Applications of FRPcomposites in concrete columns[C]//FRP Composites inCivil Engineering.Hong Kong:ELSEVIER,2001:731-740.
[6]Saatcioglu M,Elnabelsy G.Seismic retrofit of bridgecolumns with CFRP jackets[C]//FRP Composites in CivilEngineering.Hong Kong:ELSEVIER,2001:833-838.
[7]Xiao,Y.Applications of FRP composites in concretecolumns[J].International Journal of Advances in StructuralEngineering,2004,7(4):335-344.
[8]岳清瑞.纤维增强塑料(FRP)在土木工程结构中应用技术的进展[C]//第二届全国土木工程用纤维增强塑料复合材料(FRP)应用技术学术交流会论文集.北京:清华大学出版社,2002:243-246.(Yue Q R.Applicationdevelopment of fiber reinforced plastic(FRP)in civilengineering[C]//Proceedings of the Second NationalConference on Application of FRP Technology in CivilEngineering.Beijing:Tsinghua University Press,2002:243-246.(in Chinese))
[9]Hipley P.Seismic retrofit for columns/piers compositebridge column retrofitting in california[R/OL].FederalHighway Administration,FHWA,Bridge Technology,[2004].http://www.fhwa.dot.gov/bridge/frp/frpdatar.htm
[10]ACI Committee 318 Building code requirements forstructural concrete(ACI 318M-02)and commentary(318RM-02)[M].New York:Farmington Hills,Mich.,2002:443-447.
[11]ACI Committee 440 Guide for the design andstrengthening of externally bonded FRP systems forstrengthening concrete structures[S].NewYork:AmericanConcrete Institute,2000.
[12]Park Y J,Ang HS.Mechanistic seismic damage model forreinforced concrete[J].Journal of Structural Engineering,ASCE,1985,111(4):722-739.
[13]王振宇,刘晶波.建筑结构地震损伤评估的研究进展[J].世界地震工程,2001,1(3):43-48.(Wang Z Y,Liu J B.The advances of studies on seismic damageassessment of building structures[J].The Engineering ofWorld Earthquake,2001,1(3):43-48.(in Chinese))
[14]张培新.钢筋混凝土抗震结构非线性分析[M].北京:科学出版社,2003:6-13.(Zhang P X.The nonlinearanalysis of earthquake-resistant reinforced concretestructures[M].Beijing:Science Press,2003:6-13.(inChinese))
[15]Xiao Y,Wu H.Compressive behavior of concrete cylindersconfined by carbon fiber composite jackets[J].Journal ofMaterials in Civil Engineering,ASCE,2000,12(2):139-146.
[16]Bazant Z P.Prediction of concrete creep effects using age-adjusted effective modulus method[J].ACI Journal,1972,69(20):212-217.
[17]Findley W N.Mechanism andmechanics of creep of plastics[J].ACI Journal SPE,1960:57-65.
[18]Jordaan I J,Illston J M.Time-dependent strains in sealsconcrete under multiaxial compressive stress[J].Magazineof Concrete Research,1971,23(75):78-88.
[19]惠荣岩,黄国兴,易冰若.混凝土的徐变[M].北京:中国铁道出版社,1988:42-68.(Hui R Y,Huang G X,Yi BR.Creep of concrete[M].Beijing:China Railway Press,1988:42-68.(in Chinese))
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