锈蚀钢筋混凝土圆柱抗震性能的试验研究
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摘要
对不同锈蚀程度的钢筋混凝土圆柱进行低周反复试验,研究了不同轴压比下的钢筋锈蚀率对钢筋混凝土圆柱滞回曲线、骨架曲线、刚度、延性及耗能能力的影响;给出了试件累积耗能、屈服荷载、极限荷载、荷载最大值和位移延性系数与钢筋锈蚀率和轴压比的关系。研究表明,随着钢筋锈蚀率和轴压比的增大,试件的滞回曲线趋于干瘪,骨架曲线下降段变陡,试件的刚度、延性和耗能能力减小。
A low-frequency cyclic horizontal loading test was conducted on circular reinforced concrete(RC) columns with different degrees of rebar corrosion.In the experiment,the seismic behavior of corroded circular RC columns under different axial loads,such as hysteresis loops,skeleton curves,stiffness,ductility and dissipating energy capacity,were studied,and the relationships between the seismic behavior,such as accumulated energy dissipation,yield load,ultimate load,maximum load,displacement ductility coefficient,and rebar corrosion extent,axial load ratio,were established.It is shown that the stiffness,ductility and energy dissipation capacity,as well as areas of hysteresis loops of corroded circular RC columns can be significantly reduced,and descending branch of skeleton curves can be steeper with the increase of rebar corrosion and axial pressure ratio.
A low-frequency cyclic horizontal loading test was conducted on circular reinforced concrete(RC) columns with different degrees of rebar corrosion.In the experiment,the seismic behavior of corroded circular RC columns under different axial loads,such as hysteresis loops,skeleton curves,stiffness,ductility and dissipating energy capacity,were studied,and the relationships between the seismic behavior,such as accumulated energy dissipation,yield load,ultimate load,maximum load,displacement ductility coefficient,and rebar corrosion extent,axial load ratio,were established.It is shown that the stiffness,ductility and energy dissipation capacity,as well as areas of hysteresis loops of corroded circular RC columns can be significantly reduced,and descending branch of skeleton curves can be steeper with the increase of rebar corrosion and axial pressure ratio.
引文
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[2]Almusallam A A,Al-Gahtani A S,Aziz A R,et al.Effect of reinforcement corrosion on flexural behaviorof concrete slabs[J].Journal of Materials in Civil En-gineering,1996,8(3):123-127.
[3]Rodriguez J,Ortega L M,Casal J.Load carrying ca-pacity of concrete structures with corroded reinforce-ment[J].Construction and Buiding Materials,1997,11(4):239-248.
[4]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 Q X,Niu D T,Yan G Y.Experimental researchon hysteretic characteristics of corroded RC memberswith flexural and compressive axial loads under re-peated horizontal loading[J].Earthquake Engineeringand Engineering Vibration,2000,20(4):44-50.
[5]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 D T,Chen X X,Wang X M.Experimental studyon seismic performance of corroded reinforced con-crete members with flexure and compression[J].Building Structure,2004,34(10):36-38.
[6]贡金鑫,仲伟秋,赵国藩.受锈蚀钢筋混凝土偏心受压构件低周反复性能的试验研究[J].建筑结构学报,2004,25(5):92-97.Gong J X,Zhong W Q,Zhao G F.Experimental studyon low-cycle behavior of corroded reinforced concretemember under eccentric compression[J].Journal ofBuilding Structures,2004,25(5):92-97.
[7]Belarbi A,Bae S W.An experimental study on the ef-fect of environmental exposures and corrosion on RCcolumns with FRP composite jackets[J].CompositesPart B:Engineering,2007,38(5-6):674-684.
[8]Xiao J,Zhang C.Seismic behavior of RC columnswith circular,square and diamond section[J].Con-struction and Building Materials,2008,22(5):801-810.
[9]李金波.锈蚀钢筋混凝土柱抗震加固研究[D].大连:大连理工大学结构工程研究所,2008.Li J B.Study on seismic strengthening of corroded re-inforced concrete columns[D].Dalian:Institute ofStructure Engineering of Dalian University of Techno-logy,2008.
[10]仲伟秋,贡金鑫.钢筋电化学快速锈蚀试验控制方法[J].建筑技术开发,2002,29(4):28-29.Zhong W Q,Gong J X.Control method for quick elec-trochemical corrosion experiment of rebars[J].Build-ing Technique Development,2002,29(4):28-29.
[11]颜桂云,孙炳楠,王泽军,等.锈蚀钢筋混凝土压弯构件抗震性能的试验研究[J].建筑结构,2003,33(2):16-18.Yan G Y,Sun B N,Wang Z J,et al.Experimentalstudy on seismic performance of corroded reinforcedconcrete members with flexure and compression[J].Building Structure,2003,33(2):16-18.
[12]刘伯权,白国良,张国军.高轴压比高强混凝土框架柱抗震性能试验研究[J].土木工程学报,2005,38(1):45-50.Liu B Q,Bai G L,Zhang G J.An experimental studyon the seismic behavior of high strength reinforcedconcrete frame columns with high axial compressionratio[J].China Civil Engineering Journal,2005,38(1):45-50.
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