含水率和腐蚀因素对钢筋混凝土柱抗震性能的影响
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摘要
通过分析混凝土试块浸泡在水中和不同浓度腐蚀溶液中力学性能变化的试验结果,回归出混凝土抗压强度和弹性模量随含水率或腐蚀时间变化的计算模型,并通过纤维模型有限元程序OpenSees,对不同含水率或不同腐蚀程度的钢筋混凝土模型柱在低周往复荷载作用下的受力性能进行了模拟.结果表明:随着含水率的增加,两种养护条件下,构件抗震性能降低的程度较小,但随着腐蚀程度的增大,构件耗能能力和延性的降低及承载力和刚度的衰减比较显著.
Through the analysis of mechanical properties of concrete being soaked in water and different corrosion solution,this paper established the regression model of compressive strength and elastic modulus variation with water content or corrosion period,and analyzed the seismic performance of RC columns with different water content or corrosion degree under low cycle reversed loads based on the fiber model of OpenSees software.The results show that,with the increase of water content,the seismic performance of concrete under two curing conditions have no significant reduction,but with the increase of corrosion,the reduction of energy dissipation capacity and ductility,the attenuation of bearing capacity and stiffness are obvious.
Through the analysis of mechanical properties of concrete being soaked in water and different corrosion solution,this paper established the regression model of compressive strength and elastic modulus variation with water content or corrosion period,and analyzed the seismic performance of RC columns with different water content or corrosion degree under low cycle reversed loads based on the fiber model of OpenSees software.The results show that,with the increase of water content,the seismic performance of concrete under two curing conditions have no significant reduction,but with the increase of corrosion,the reduction of energy dissipation capacity and ductility,the attenuation of bearing capacity and stiffness are obvious.
引文
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[6]LI Jinbo,GONG Jinxin,WANG Licheng.Seismic behav-ior of corrosion-damaged reinforced concrete columnsstrengthened using combined carbon fiber-reinforced poly-mer and steel jacket[J].Construction and Building Materi-als,2009,23:2653-2663.
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[8]陈元素.受腐蚀混凝土力学性能试验研究[D].大连:大连理工大学,2006.CHEN Yuansu.Experimental study on mechanical proper-ty of corroded concrete[D].Dalian:Dalian University ofTechnology,2006.(in Chinese)
[9]曹双寅.受腐蚀混凝土的力学性能[J].东南大学学报,1991,21(4):89-95.CAO Shuangyin.Mechanical properties of corroded con-crete[J].Journal of Southeast University,1991,21(4):89-95.(in Chinese)
[10]Scott B D,Park R,Priestley M J N.Stress-strain behav-ior of concrete confined by overlapping hoops at low andhigh strain rates[J].ACI Journal,1982,79(1):13-27.
[11]Blakeley R P.Prestressed concrete sections with cyclicflexure[J].Journal of the Structural Division,1973,99(8):1717-1742.
[12]Filip C F.A Fiber beam-column element for seismic re-sponse analysis of RC structures[R].California:Universi-ty of California,Berkeley,1991.
[2]Han-Seung Lee,Tadatsugu Kage,Takafumi Noguchi,etal.An experimental study on the retrofitting effects of re-inforced concrete columns damaged by rebar corrosionstrengthened with carbon fiber sheets[J].Cement andConcrete Research,2003,33:563-570.
[3]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 Qingxuan,NIU Ditao,YAN Guiyun.Experimentalresearch on hysteretic characteristics of corroded R.C.Members with flexural and compressive axial loads underrepeated horizontal loading[J].Journal of Earthquake En-gineering and Engineering Vibration,2000,20(4):44-50.(in Chinese)
[4]贡金鑫,仲伟秋,赵国藩.受腐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):92-104.GONG Jinxin,ZHONG Weiqiu,ZHAO Guofan.Experi-mental study on low-cycle behavior of corroded reinforcedconcrete member under eccentric compression[J].Journalof Building Structures,2004,25(5):92-104.(in Chi-nese)
[5]贡金鑫,李金波,赵国藩.受腐蚀钢筋混凝土构件的恢复力模型[J].土木工程学报,2005,38(11):38-44.GONG Jinxin,LI Jinbo,ZHAO Guofan.Restoring forcemodel of corroded reinforced concrete elements[J].ChinaCivil Engineering Journal,2005,38(11):38-44.(inChinese)
[6]LI Jinbo,GONG Jinxin,WANG Licheng.Seismic behav-ior of corrosion-damaged reinforced concrete columnsstrengthened using combined carbon fiber-reinforced poly-mer and steel jacket[J].Construction and Building Materi-als,2009,23:2653-2663.
[7]李林.含水率对混凝土性能影响的研究[D].北京:北京交通大学,2009.LI Lin.Study on effect of water content on concrete per-formance[D].Beijing:Beijing Jiaotong University,2009.(in Chinese)
[8]陈元素.受腐蚀混凝土力学性能试验研究[D].大连:大连理工大学,2006.CHEN Yuansu.Experimental study on mechanical proper-ty of corroded concrete[D].Dalian:Dalian University ofTechnology,2006.(in Chinese)
[9]曹双寅.受腐蚀混凝土的力学性能[J].东南大学学报,1991,21(4):89-95.CAO Shuangyin.Mechanical properties of corroded con-crete[J].Journal of Southeast University,1991,21(4):89-95.(in Chinese)
[10]Scott B D,Park R,Priestley M J N.Stress-strain behav-ior of concrete confined by overlapping hoops at low andhigh strain rates[J].ACI Journal,1982,79(1):13-27.
[11]Blakeley R P.Prestressed concrete sections with cyclicflexure[J].Journal of the Structural Division,1973,99(8):1717-1742.
[12]Filip C F.A Fiber beam-column element for seismic re-sponse analysis of RC structures[R].California:Universi-ty of California,Berkeley,1991.
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