预静态加载后的混凝土动态受压特性试验
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摘要
进行了混凝土在应变速率分别为10-5/s、10-4/s、10-3/s的条件下,经历极限抗压强度分别为0、40%、60%、75%和85%的单调荷载作用的动态单轴压缩试验,在此基础上分析了经历不同单调加载历史和应变速率下混凝土的峰值应力、峰值应变和弹性模量的变化规律。试验结果表明,随着应变速率的提高,动态单轴抗压强度明显增加;当单调加载应力水平高于某一应力阈值时,混凝土极限抗压强度明显降低;混凝土弹性模量随着应变速率的提高而增加,随着单调加载幅值的增加表现出先增大后减小的趋势;混凝土峰值应变随着应变速率的提高而增加,随着单调加载幅值的增加而减少。
Dynamic uniaxial compression experiment for concrete was carried out,in which specimens were subjected to monotonic loading of 0,40%,60%,75% and 85% of ultimate compressive strength respectively,and at strain rates 10-5/s,10-4/s and 10-3/s,respectively.The variation of the peak stress,the peak strain and the elastic modulus of concrete subjected to different loading history and at different strain rates was comparatively analyzed.Experimental results show that the dynamic uniaxial compressive strength of concrete increases obviously with the increase of strain rate and decreases obviously when loading exceeds a certain threshold;the elastic modulus of concrete is improved with the increase of strain rate,but it presents a first increased then decreased trend with the increase of monotonic loading amplitude;the peak strain increases with the increase of strain rate and decreases with the increase of monotonic loading amplitude.
Dynamic uniaxial compression experiment for concrete was carried out,in which specimens were subjected to monotonic loading of 0,40%,60%,75% and 85% of ultimate compressive strength respectively,and at strain rates 10-5/s,10-4/s and 10-3/s,respectively.The variation of the peak stress,the peak strain and the elastic modulus of concrete subjected to different loading history and at different strain rates was comparatively analyzed.Experimental results show that the dynamic uniaxial compressive strength of concrete increases obviously with the increase of strain rate and decreases obviously when loading exceeds a certain threshold;the elastic modulus of concrete is improved with the increase of strain rate,but it presents a first increased then decreased trend with the increase of monotonic loading amplitude;the peak strain increases with the increase of strain rate and decreases with the increase of monotonic loading amplitude.
引文
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[13]肖诗云,张剑.荷载历史对混凝土动态受压损伤特性影响试验研究[J].水利学报,2010,41(8):943-952(XIAO Shi-yun,ZHANG Jian.Experiment study on effect of load histories on dynamic compressive damagebehaviors of concrete[J].Journal of Hydraulic Engineering,2010,41(8):943-952(in Chinese))
[14]陈潇洋,于海祥,王学远,武建华.基于0.2定围压比状态下的约束混凝土性能研究[J].实验力学,2012,27(2):195-200(CHEN Xiao-yang,YU Hai-xiang,WANG Xue-yuan,WU Jian-hua.On the Restrained ConcretePerformance Under the 0.2 Constant Surrounding Pressure Ratio Condition[J].Journal of ExperimentalMechanics,2012,27(2):195-200(in Chinese))
[15]武建华,于海祥,李强,姜永东.定围压比作用下混凝土轴向受压性能试验研究[J].实验力学,2007,22(2):142-148(WU Jian-hua,YU Hai-xiang,LI Qiang,JIANG Yong-dong.Experimental Study on Axial Property forConcrete with Constant Surrounding Pressure Ratio[J].Journal of Experimental Mechanics,2007,22(2):142-148(in Chinese))
[16]林皋,闫东明,肖诗云,胡志强.应变速率对混凝土特性及工程结构地震响应的影响[J].土木工程学报,2005,38(11):1-8,63(Lin Gao,Yan Dongming,Xiao Shiyun,Hu Zhiqiang.Strain rate effects on the behavior ofconcrete and the seismic response of concrete structures[J].China Civil Engineering Journal,2005,38(11):1-8,63(in Chinese))
[17]林皋.混凝土大坝抗震安全评价的发展趋向[J].防灾减灾工程学报,2006,26(1):1-12(LIN Gao.DevelopingTendency of the Seismic Safety Evaluation of Large Concrete Dams[J].Journal of Disaster Prevention andMitigation Engineering,2006,26(1):1-12(in Chinese))
[2]李庆斌,王海龙.水环境对混凝土力学性能的影响研究评述[J].中国科技论文在线,2006,1(2):83-94(LiQingbin,Wang Hailong.Influence of Ambient Water on Properties of Concrete[J].Sciencepaper Online,2006,1(2):83-94(in Chinese))
[3]Moore O L.Report of working committee of committee C-1on plastic mortar tests for Portland cement[C].Proceeding of the American society for testing materials,1934,34:322.
[4]Evans R H.Effect of rate of loading on the mechanical properties of some materials[J].J of Inst.of civ.Engrs.,1942,18(7-8):296-306.
[5]Murdock J W.A critical review of research on fatigue of plain concrete[D].Urbana,University OfIllinois,pp.25,Engineering Experiment Station Bulletin No.475,2006.
[6]Dhir R K,Sangha C M.A Study of relationships between time,strength,deformation and fracture of plainconcrete[J].Magazine of Concrete Research,2007,24(81):197-208.
[7]Thaulow S.Rate of loading or compressive strength test[D].Betong,1993,38(1):11-15.
[8]Rush H.Research towards a general flexural theory for structural concrete[J].ACI J.,2006,57(1):1-28.
[9]Spark P R,Menzies J B.The effect of rate loading upon the static and fatigue strengths of plain concrete incompression[J].Magazine of Concrete Research,2007,25(83):73-80.
[10]Spooner D C.Stress-stress-time relationships for concrete[J].Mag.Concr.Res.,2008,24(81):197-208.
[11]Volker Slowik,Victor E Saouma.Water pressure in propagating concrete cracks[J].Journal of StructuralEngineering,2000(3):235-242.
[12]林皋,周洪涛,黄承逵.循环加载历史对混凝土断裂特性影响的试验研究[J].水利学报,1994(5):25-30(LinGao,Zhou Hongtao,Huang Chengkui.Experimental study of the effect of cyclic loading history on the fractureproperties of concrete[J].Journal of Hydraulic Engineering,1994(5):25-30(in Chinese))
[13]肖诗云,张剑.荷载历史对混凝土动态受压损伤特性影响试验研究[J].水利学报,2010,41(8):943-952(XIAO Shi-yun,ZHANG Jian.Experiment study on effect of load histories on dynamic compressive damagebehaviors of concrete[J].Journal of Hydraulic Engineering,2010,41(8):943-952(in Chinese))
[14]陈潇洋,于海祥,王学远,武建华.基于0.2定围压比状态下的约束混凝土性能研究[J].实验力学,2012,27(2):195-200(CHEN Xiao-yang,YU Hai-xiang,WANG Xue-yuan,WU Jian-hua.On the Restrained ConcretePerformance Under the 0.2 Constant Surrounding Pressure Ratio Condition[J].Journal of ExperimentalMechanics,2012,27(2):195-200(in Chinese))
[15]武建华,于海祥,李强,姜永东.定围压比作用下混凝土轴向受压性能试验研究[J].实验力学,2007,22(2):142-148(WU Jian-hua,YU Hai-xiang,LI Qiang,JIANG Yong-dong.Experimental Study on Axial Property forConcrete with Constant Surrounding Pressure Ratio[J].Journal of Experimental Mechanics,2007,22(2):142-148(in Chinese))
[16]林皋,闫东明,肖诗云,胡志强.应变速率对混凝土特性及工程结构地震响应的影响[J].土木工程学报,2005,38(11):1-8,63(Lin Gao,Yan Dongming,Xiao Shiyun,Hu Zhiqiang.Strain rate effects on the behavior ofconcrete and the seismic response of concrete structures[J].China Civil Engineering Journal,2005,38(11):1-8,63(in Chinese))
[17]林皋.混凝土大坝抗震安全评价的发展趋向[J].防灾减灾工程学报,2006,26(1):1-12(LIN Gao.DevelopingTendency of the Seismic Safety Evaluation of Large Concrete Dams[J].Journal of Disaster Prevention andMitigation Engineering,2006,26(1):1-12(in Chinese))
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