钢纤维混凝土桥墩抗震性能数值模拟与试验
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摘要
基于纤维模型的有限元分析技术,采用考虑钢纤维影响的混凝土材料模型和考虑黏结-滑移效应的钢筋材料模型,建立了在反复荷载作用下普通混凝土和钢纤维增强混凝土桥墩的非线性有限元模型.采用数值分析方法得到钢纤维体积分数、配箍率和钢纤维混凝土区高度对钢纤维混凝土桥墩模型滞回曲线、骨架曲线和延性性能等抗震能力的影响规律,并与试验结果进行了对比.结果表明:数值模拟与拟静力试验结果基本一致,呈现出相似的规律性;钢纤维可部分代替箍筋的抗震作用,在一定范围内随着钢纤维体积分数的增加,桥墩试件的抗震性能增强;在桥墩局部采用钢纤维混凝土,可达到与整体采用钢纤维混凝土相近的抗震能力.
The nonlinear finite element models of concrete piers under cyclic loading were established with the analytical method of fiber model.The concrete material model with a consideration of the effect of steel fiber and the steel material model with a consideration of the bond-slip effect were adopted.The influences of steel fiber volume fraction,stirrup ratio and the height of steel fiber reinforced concrete(SFRC) region on seismic capacity of the piers,such as hysteretic characteristics,skeleton curves and ductility,were obtained by the numerical analysis.The comparison numerical results were compared with the test results.The results show that the simulation results of seismic response are basically identical with the pseudo-static test results;parts of the stirrups' roles of seismic resistance can be substituted by the addition of steel fibers,and the seismic capacity of concrete piers is improved with the increase of steel fiber content in a certain range;similar seismic capacity can be sustained when the piers are constructed with a local or a whole application of SFRC.
The nonlinear finite element models of concrete piers under cyclic loading were established with the analytical method of fiber model.The concrete material model with a consideration of the effect of steel fiber and the steel material model with a consideration of the bond-slip effect were adopted.The influences of steel fiber volume fraction,stirrup ratio and the height of steel fiber reinforced concrete(SFRC) region on seismic capacity of the piers,such as hysteretic characteristics,skeleton curves and ductility,were obtained by the numerical analysis.The comparison numerical results were compared with the test results.The results show that the simulation results of seismic response are basically identical with the pseudo-static test results;parts of the stirrups' roles of seismic resistance can be substituted by the addition of steel fibers,and the seismic capacity of concrete piers is improved with the increase of steel fiber content in a certain range;similar seismic capacity can be sustained when the piers are constructed with a local or a whole application of SFRC.
引文
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[3]范立础,李建中.汶川桥梁震害分析与抗震设计对策[J].公路,2009,5(5):122.FAN Lichu,LI Jianzhong.Earthquake disaster investigationand seismic design response of bridges in Wenchuanearthquake[J].Highway,2009,5(5):122.
[4]Priestley M J N,Park R.Strength and ductility of concretebridges columns under seismic loading[J].Structural Journalof American Concrete Institute,1987,84(1):61.
[5]袁万城,范立础.高强混凝土结构的延性抗震设计[J].同济大学学报,1994,22(4):445.YUAN Wancheng,FAN Lichu.The seismic ductility designof high-strength concrete structures[J].Journal of TongjiUniversity,1994,22(4):445.
[6]Romualdi J P,Batson G B.Mechanics of crack arrest inconcrete[J].Journal of Engineering Mechanics,Division ofProceedings of the American Society of Civil Engineering,1963,89(EM3):147.
[7]Shah S P,Rangan B V.Fiber reinforced concrete properties[J].ACI Journal,1971,68(14):126.
[8]Johnston C D.Steel fiber reinforced mortar and concrete:areview of mechanical properties[R].Farmington Hills:American Concrete Institute,1974.
[9]Swamy R N.Fiber reinforced concrete of cement and concrete[J].Materials and Structures,1975,8(45):235.
[10]Ozcan D M,Bayraktar A,Sahin A,et al.Experimental andfinite element analysis on the steel fiber-reinforced concrete(SFRC)beams ultimate behavior[J].Construction andBuilding Materials,2009,23:1064.
[11]ZHANG Yuye,WEI Hongyi,YUAN Wancheng,et al.Seismic performance of SFRC piers under reversed cyclicloading[J].Applied Mechanics and Materials,2012,178/181:2228.
[12]Mazzoni S,Mckenna F,Scott M H,et al.OpenSEEScommand language manual[CP/OL].[2007-09-20].http://OpenSEES.Berkeley.edu/OpenSEES/manuals/usermanuaI/
[13]Chang G A,Mander J B.Seismic energy based fatigue damageananlysis of bridgecolumns:Part 1—evaluation of seismiccapacity[R].New York:State University of New York,1994.
[14]Nataraja,M C,Dhang N,Gupta A P.Stress strain curve forsteel-fiber reinforced concrete under compression[J].CementConcrete Composites,1999,21:383.
[15]过镇海,时旭东.钢筋混凝土原理与分析[M].北京:清华大学出版社,2003.GUO Zhenhai,SHI Xudong.Reinforced concrete theory andanalyse[M].Beijing:Tsinghua University Press,2003.
[16]Gomes A,Appleton J.Nonlinear cyclic stress-strainrelationship of reinforcing bars including buckling[J].Engineering Structures,1997,19(10):822.
[17]Harajli M H,Gharzeddine O.Effect of steel fibers on bondperformance of steel bars in NSC and HSC under loadreversals[J].Journal of Materials in Civil Engineering,2007,19(10):864.
[18]Campione G,Cucchiara C,Mendola L L,et al.Experimentalinvestigation on local bond-slip behaviour in lightweight fiberreinforced concrete under cyclic actions[J].Proceeding of 13thWorld Conference on Earthquake Engineering.Vancouver:WCEE,2004:2087.
[19]Zhao J,Sritharan S.Modeling of strain penetration effects infiber-based analysis of reinforced concrete structures[J].ACIStructural Journal,2007,104(2):133.
[20]Harajli M H,Hamad B S,Karam K.Bond-slip response ofrebars embedded in plain and FRC[J].Journal of Materials inCivil Engineering,2002,14(6):503.
[21]Harajli M H.Bond behavior in steel fiber-reinforced concretezones under static and cyclic loading:experimental evaluationsand analytical modeling[J].Journal of Materials in CivilEngineering,2010,22(7):674.
[22]朱伯龙.结构抗震试验[M].北京:地震出版社,1989.ZHU Bolong.Structural seismic test[M].Beijing:Seismological Press,1989.
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