模型试验的微粒混凝土力学性能试验研究
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摘要
开展微粒混凝土不同加载应变率和不同初始静态荷载下力学性能和抗压强度尺寸效应试验研究。试验结果表明:微粒混凝土的动态抗压强度和弹性模量随着加载应变率的增加而提高,不同应变率下微粒混凝土峰值应力处的应变基本相同,应力-应变曲线相似,破坏形式相同;微粒混凝土的动态抗压强度随着初始静载比例的提高而降低,但破坏形式相同。振动台模型试验中微粒混凝土可以较好地模拟原型普通混凝土。在试验的基础上,进一步建立考虑应变率和初始静载影响的微粒混凝土抗压强度和弹性模量计算方法,提出微粒混凝土不同应变率下本构关系实用计算模型和抗压强度尺寸效应计算公式,建立振动台模型试验微粒混凝土强度控制准则。研究成果可用于振动台模型试验微粒混凝土相似关系设计和结果分析。
The mechanical property and size effect of microconcrete under compression are investigated through experiments,implemented under different strain rate loadings and distinctive initial static loadings.The observations illustrate that the dynamic compressive strength and elastic modulus of the microconcrete increase with the strain rate.Under different strain rate,the microconcrete strain values at peak stress are close,and the constitutive model and failure type are also quite similar.The dynamic compressive strength of the microconcrete decreasinges with increase of the initial static load,and the failure types are identical.The microconcrete in the experiment is for simulation of general concrete in shaking table test.Based on the experiments,the computation of compressive strength and elastic modulus of the microconcrete is further formulated,considering the influence of the stain rate and initial static load.The constitutive model and size effect are also studied.The law for the compressive strength of microconcrete is presented.
The mechanical property and size effect of microconcrete under compression are investigated through experiments,implemented under different strain rate loadings and distinctive initial static loadings.The observations illustrate that the dynamic compressive strength and elastic modulus of the microconcrete increase with the strain rate.Under different strain rate,the microconcrete strain values at peak stress are close,and the constitutive model and failure type are also quite similar.The dynamic compressive strength of the microconcrete decreasinges with increase of the initial static load,and the failure types are identical.The microconcrete in the experiment is for simulation of general concrete in shaking table test.Based on the experiments,the computation of compressive strength and elastic modulus of the microconcrete is further formulated,considering the influence of the stain rate and initial static load.The constitutive model and size effect are also studied.The law for the compressive strength of microconcrete is presented.
引文
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[12]Moncarz P D.Theory and application ofexperimental model analysis in earthquake engineering[D].Stanford:Stanford University,1981:121-122
[13]吕西林.复杂高层建筑结构抗震理论与应用[M].北京:科学出版社,2007:284-286
[14]GB 50010—2002混凝土结构设计规范[S].北京:中国建筑工业出版社,2002(GB 50010—2002 Code for designof concrete structures[S].Beijing:China Architecture&Building Press,2002(in Chinese))
[15]尚仁杰.混凝土动态本构行为研究[D].大连:大连理大大学,1994(Shang Renjie.Dynamic constitutivecharacteristic study of concrete[D].Dalian:DalianUniversity of Technology,1994(in Chinese))
[2]林皋,闫东明,肖诗云,等.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(Lin Gao,Yan Dongming,Xiao Shiyun,et al.Strain rate effects on the behavior of concrete and theseismic response of concrete structures[J].China CivilEngineering Journal,2005,38(11):1-8(in Chinese))
[3]肖诗云,林皋,逮静洲,等.应变率对混凝土抗压特性的影响[J].哈尔滨建筑大学学报,2002,35(5):35-39(Xiao Shiyun,Lin Gao,Lu Jingzhou,et al.Effect ofstrain rate on dynamic behavior of concrete in compression[J].Journal of Harbin University of Civil Engineering andArchitecture,2002,35(5):35-39(in Chinese))
[4]闫东明,林皋.混凝土单轴动态压缩特性试验研究[J].水科学与工程技术,2005(6):8-10(Yan Dongming,LinGao.Experimental study on the uniaxial dynamiccompression properties of concrete[J].Water Sciences andEngineering Technology,2005(6):8-10(in Chinese))
[5]董毓利,谢和平,赵鹏.不同应变率下混凝土受压全过程的实验研究及其本构模型[J].水利学报,1997,28(7):72-77(Dong Yuli,Xie Heping,Zhao Peng.Experimentalstudy and constitutive model on concrete under compressionwith different strain rate[J].Journal of HydraulicEngineering,1997,28(7):72-77(in Chinese))
[6]Zheng Dan,Li Qingbin.An explanation for rate effect ofconcrete strength based on fracture toughness including freewater viscosity[J].Engineering Fracture Mechanics,2004,71(16/17):2319-2327
[7]吕培印,宋玉普.混凝土动态压缩试验及其本构模型[J].海洋工程,2002,20(2):43-48(LüPeiyin,SongYupu.Dynamic compressive test of concrete and itsconstitutive model[J].Ocean Engineering,2002,20(2):43-48(in Chinese))
[8]杨政,廖红建,楼康禺.微粒混凝土受压应力应变全曲线试验研究[J].工程力学,2002,19(2):90-94(YangZheng,Liao Hongjian,Lou Kangyu.Experimental study ofthe full curve of the stress-strain relationship formicroconcrete[J].Engineering Mechanics,2002,19(2):90-94(in Chinese))
[9]常留红,陈建康.单轴压缩下水泥砂浆本构关系的试验研究[J].水利学报,2007,38(2):217-220(Chang Liuhong,Chen Jiankang.Experimental study on constitutive relation ofcement mortar[J].Journal of Hydraulic Engineering,2007,38(2):217-220(in Chinese))
[10]Kaplan S A.Factors affecting the relationship between rateof loading and measured compressive strength of concrete[J].Magazine of Concrete Research,1980,32(111):79-88
[11]闫东明,林皋.不同初始静态荷载下混凝土动态抗压特性试验研究[J].水利学报,2006,37(3):360-364(YanDongming,Lin Gao.Study on dynamic compressiveproperties of concrete with different loading paths[J].Journal of Hydraulic Engineering,2006,37(3):360-364(in Chinese))
[12]Moncarz P D.Theory and application ofexperimental model analysis in earthquake engineering[D].Stanford:Stanford University,1981:121-122
[13]吕西林.复杂高层建筑结构抗震理论与应用[M].北京:科学出版社,2007:284-286
[14]GB 50010—2002混凝土结构设计规范[S].北京:中国建筑工业出版社,2002(GB 50010—2002 Code for designof concrete structures[S].Beijing:China Architecture&Building Press,2002(in Chinese))
[15]尚仁杰.混凝土动态本构行为研究[D].大连:大连理大大学,1994(Shang Renjie.Dynamic constitutivecharacteristic study of concrete[D].Dalian:DalianUniversity of Technology,1994(in Chinese))
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