GFRP管约束再生混凝土柱抗震性能与损伤评价
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摘要
以再生粗骨料取代率、混凝土强度为主要参数,开展了6个玻璃纤维增强塑料(GFRP)管再生混凝土柱试件的低周反复试验,对试件的承载力、刚度退化过程、滞回特性、延性、耗能能力、破坏形态等抗震性能进行研究。研究结果表明:GFRP管约束再生混凝土柱的耗能能力、延性、滞回特性随着再生粗骨料取代率、混凝土强度的改变而略有变化;粘结滑移的效应对试件的抗震性能影响很小;GFRP管约束再生混凝土柱极限承载力受混凝土强度作用影响并不明显。最后,提出GFRP约束再生混凝土柱归一化损伤计算公式,该模型能较好地反映GFRP管约束再生混凝土柱的损伤发展。
Low frequency cyclic loading test of six recycled concrete filled Glass Fiber Reinforced Plastic(GFRP) tube(RCFF) columns was performed.The main parameters in the test are the Recycled Coarse Aggregate(RCA) replacement percentage,the strength of core concrete.The bearing capacity,the stiffness degradation,the ductility and the energy dissipation capacity and the failure pattern of columns with different RCA replacement percentage were studied.The findings indicate that the energy dissipation capacity,ductility and hysteresis vary slightly with the RCA replacement percentage and concrete strength.It is shown that the bond-slip has little effect on the seismic performance of the specimens.The effect of RCA replacement percentage on the bearing capacity of confined recycled concrete columns is not obvious.Finally,a normalization damage assessment method was developed for the RCFF columns.The model could well explain the damage development of RCFF columns.
Low frequency cyclic loading test of six recycled concrete filled Glass Fiber Reinforced Plastic(GFRP) tube(RCFF) columns was performed.The main parameters in the test are the Recycled Coarse Aggregate(RCA) replacement percentage,the strength of core concrete.The bearing capacity,the stiffness degradation,the ductility and the energy dissipation capacity and the failure pattern of columns with different RCA replacement percentage were studied.The findings indicate that the energy dissipation capacity,ductility and hysteresis vary slightly with the RCA replacement percentage and concrete strength.It is shown that the bond-slip has little effect on the seismic performance of the specimens.The effect of RCA replacement percentage on the bearing capacity of confined recycled concrete columns is not obvious.Finally,a normalization damage assessment method was developed for the RCFF columns.The model could well explain the damage development of RCFF columns.
引文
[1]Buck A D.Recycled concrete as a source of aggregate[J].ACI Journal,1977,74(5):212-219
[2]Ravindrarajah R S,Tam C T.Properties of concrete madewith crushed concrete as coarse aggregate[J].Magazine ofConcrete Research,1985,37(130):29-38
[3]Fam A,Flisak B,Rizkalla S.Experimental and analyticalmodeling of concrete-filled fiber-reinforced polymer tubessubjected to combined bending and axial loads[J].ACIStructural Journal,2003,100(4):499-509
[4]Toutanji H,Saafi M.Durability studies on concrete columnsencased in PVC-FRP composite tubes[J].CompositeStructures,2001,54(1):27-35
[5]Yu T,Wong Y L,Teng J G.Flexural behavior of hybridFRP-concrete-steel double-skin tubular members[J].Journal of Composites for Construction,2006,10(5):443-452
[6]Sheikh S A,Li Y.Design of FRP confinement for squareconcrete columns[J].Engineering Structures,2007,29(6):1074-1083
[7]卓卫东,范立础.GFRP管-混凝土组合桥墩的概念及其抗震性能[J].福州大学学报:自然科学版,2005,33(1):73-79(Zhuo Weidong,Fan Lichu.The concept andseismic performance of GFRP tube-concrete composite piers[J].Journal of Fuzhou University:Natural ScienceEdition,2005,33(1):73-79(in Chinese))
[8]杨刻亚,刘庆洋.GFRP管混凝土圆形管柱抗震性能试验研究[J].长春工程学院学报:自然科学版,2008,9(1):29-31(Yang Keya,Liu Qingyang.Seismicperformance experimental research of GFRP-concretecircular tube columns[J].Journal of Changchun Instituteof Technology:Natural Science Edition,2008,9(1):29-31(in Chinese))
[9]肖建庄,杨洁.玻璃纤维增强塑料约束再生混凝土轴压试验[J].同济大学学报:自然科学版,2009,37(12):1586-1591(Xiao Jianzhuang,Yang Jie.On recycledconcrete confined by GFRP tube under axial compression[J].Journal of Tongji University:Natural Science Edition,2009,37(12):1586-1591(in Chinese))
[10]GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001(GB50011—2001Code for seismicdesign of buildings[S].Beijing:China Architecture&Building Press,2001(in Chinese))
[11]Park Y J,Alfredo H S A F.Mechanistic seismic damagemodel for reinforced concrete[J].Journal of StructuralEngineering,1985,111(4):722-739
[12]Fajfar P.Equivalent ductility factors,taking into accountlow-cycle fatigue[J].Earthquake Engineering&StructuralDynamics,1992,21(10):837-848
[13]Chai Y H,Romstad K M,Bird S M.Energy-based lineardamage model for high-intensity seismic loading[J].Journal of Structural Engineering,1995,121(5):857-864
[14]吕大刚,王光远.基于损伤性能的抗震结构最优设防水准的决策方法[J].土木工程学报,2001,34(1):44-49(Lu Dagang,Wang Guangyuan.Decision-making methodof optimal fortification level for aseismic structures based ondamage performance[J].China Civil Engineering Journal,2001,34(1):44-49(in Chinese))
[15]陈林之,蒋欢军,吕西林.修正的钢筋混凝土结构Park-Ang损伤模型[J].同济大学学报:自然科学版,2010,38(8):1103-1107(Chen Linzhi,Jiang Huanjun,LuXilin.Modified Park-Ang damage model for reinforcedconcrete structures[J].Journal of Tongji University:Natural Science Edition,2010,38(8):1103-1107(inChinese))
[16]单波,肖岩.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[J].建筑结构学报,2008,29(3):111-119(Shan Bo,Xiao Yan.Long-term residualbehavior of FRP retrofitted RC columns after damaged bysimulated earthquake loading[J].Journal of BuildingStructures,2008,29(3):111-119(in Chinese))
[17]International Federation for Structural Concrete.Displacement-based seismic design of reinforced concrete buildings[R].Lausanne:International Federation for Structural Concrete,2003
[18]Eurocode 8:Design of structures for earthquake resistance[S].Brussels:European Committee for Standardization,2005
[2]Ravindrarajah R S,Tam C T.Properties of concrete madewith crushed concrete as coarse aggregate[J].Magazine ofConcrete Research,1985,37(130):29-38
[3]Fam A,Flisak B,Rizkalla S.Experimental and analyticalmodeling of concrete-filled fiber-reinforced polymer tubessubjected to combined bending and axial loads[J].ACIStructural Journal,2003,100(4):499-509
[4]Toutanji H,Saafi M.Durability studies on concrete columnsencased in PVC-FRP composite tubes[J].CompositeStructures,2001,54(1):27-35
[5]Yu T,Wong Y L,Teng J G.Flexural behavior of hybridFRP-concrete-steel double-skin tubular members[J].Journal of Composites for Construction,2006,10(5):443-452
[6]Sheikh S A,Li Y.Design of FRP confinement for squareconcrete columns[J].Engineering Structures,2007,29(6):1074-1083
[7]卓卫东,范立础.GFRP管-混凝土组合桥墩的概念及其抗震性能[J].福州大学学报:自然科学版,2005,33(1):73-79(Zhuo Weidong,Fan Lichu.The concept andseismic performance of GFRP tube-concrete composite piers[J].Journal of Fuzhou University:Natural ScienceEdition,2005,33(1):73-79(in Chinese))
[8]杨刻亚,刘庆洋.GFRP管混凝土圆形管柱抗震性能试验研究[J].长春工程学院学报:自然科学版,2008,9(1):29-31(Yang Keya,Liu Qingyang.Seismicperformance experimental research of GFRP-concretecircular tube columns[J].Journal of Changchun Instituteof Technology:Natural Science Edition,2008,9(1):29-31(in Chinese))
[9]肖建庄,杨洁.玻璃纤维增强塑料约束再生混凝土轴压试验[J].同济大学学报:自然科学版,2009,37(12):1586-1591(Xiao Jianzhuang,Yang Jie.On recycledconcrete confined by GFRP tube under axial compression[J].Journal of Tongji University:Natural Science Edition,2009,37(12):1586-1591(in Chinese))
[10]GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001(GB50011—2001Code for seismicdesign of buildings[S].Beijing:China Architecture&Building Press,2001(in Chinese))
[11]Park Y J,Alfredo H S A F.Mechanistic seismic damagemodel for reinforced concrete[J].Journal of StructuralEngineering,1985,111(4):722-739
[12]Fajfar P.Equivalent ductility factors,taking into accountlow-cycle fatigue[J].Earthquake Engineering&StructuralDynamics,1992,21(10):837-848
[13]Chai Y H,Romstad K M,Bird S M.Energy-based lineardamage model for high-intensity seismic loading[J].Journal of Structural Engineering,1995,121(5):857-864
[14]吕大刚,王光远.基于损伤性能的抗震结构最优设防水准的决策方法[J].土木工程学报,2001,34(1):44-49(Lu Dagang,Wang Guangyuan.Decision-making methodof optimal fortification level for aseismic structures based ondamage performance[J].China Civil Engineering Journal,2001,34(1):44-49(in Chinese))
[15]陈林之,蒋欢军,吕西林.修正的钢筋混凝土结构Park-Ang损伤模型[J].同济大学学报:自然科学版,2010,38(8):1103-1107(Chen Linzhi,Jiang Huanjun,LuXilin.Modified Park-Ang damage model for reinforcedconcrete structures[J].Journal of Tongji University:Natural Science Edition,2010,38(8):1103-1107(inChinese))
[16]单波,肖岩.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[J].建筑结构学报,2008,29(3):111-119(Shan Bo,Xiao Yan.Long-term residualbehavior of FRP retrofitted RC columns after damaged bysimulated earthquake loading[J].Journal of BuildingStructures,2008,29(3):111-119(in Chinese))
[17]International Federation for Structural Concrete.Displacement-based seismic design of reinforced concrete buildings[R].Lausanne:International Federation for Structural Concrete,2003
[18]Eurocode 8:Design of structures for earthquake resistance[S].Brussels:European Committee for Standardization,2005
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