混凝土损伤演化的随机力学参数细观数值影响分析
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摘要
在提出一种交叠骨料微步长迭代自动调整算法的基础上,采用任意凹凸型骨料配置算法建立混凝土细观数值试件。基于细观单元的弹性损伤本构关系,采用位移控制模式,着重针对两类常用的力学参数随机分布——Weibull及对数正态分布,进行了不同力学参数的常规混凝土拉压数值模型破坏试验,分析了主要力学参数的随机分布对混凝土试件宏观表征力学性质的影响。该研究可为混凝土细观数值模型中力学参数的合理确定提供依据。
According to the objective grading curve and filling area fraction of aggregates,numerical concrete specimen was firstly built on the basis of the advanced numerical generation method of aggregates with random shapes.And then,mesoscopic numerical simulation tests were carried out to study the damage evolution and to compare the influences of mechanical parameter distribution patterns(Weibull and lognormal distribution) on the mesoscopic strength of concrete specimen.Numerical result shows that Weibull distribution pattern is more active to reflect the discrete mechanical properties of concrete.
According to the objective grading curve and filling area fraction of aggregates,numerical concrete specimen was firstly built on the basis of the advanced numerical generation method of aggregates with random shapes.And then,mesoscopic numerical simulation tests were carried out to study the damage evolution and to compare the influences of mechanical parameter distribution patterns(Weibull and lognormal distribution) on the mesoscopic strength of concrete specimen.Numerical result shows that Weibull distribution pattern is more active to reflect the discrete mechanical properties of concrete.
引文
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[2]马怀发,陈厚群,黎保琨.细观结构不均匀性对混凝土动弯拉强度的影响[J].水利学报,2005,36(7):846-852.MA Huai-fa,CHEN Hou-qun,LI Bao-kun.Influenceof Meso-structure Heterogeneity on Dynamic BendingStrength of Concrete[J].Journal of Hydraulic Engi-neering,2005,36(7):846-852.
[3]刘庭金,朱合华,莫海鸿.非均质混凝土破坏过程的细观数值试验[J].岩石力学与工程学报,2005,24(22):4 120-4 133.LIU Ting-jin,ZHU He-hua,MO Hai-hong.Meso-structure Numerical Test of Nonuniformity ConcreteDamage Process[J].Chinese Journal of Rock Me-chanics and Engineering,2005,24(22):4 120-4 133.
[4]马怀发,陈厚群,黎保琨.混凝土试件细观结构的数值模拟[J].水利学报,2004,35(10):27-35.MA Huai-fa,CHEN Hou-qun,LI Bao-kun.Meso-structure Numerical Simulation of Concrete Specimen[J].Journal of Hydraulic Engineering,2004,35(10):27-35.
[5]刘小燕,颜东煌,张峰,等.预应力高强混凝土梁极限承载力分析[J].中国公路学报,2006,19(1):58-61.LIU Xiao-yan,YAN Dong-huang,ZHANG Feng,et al.Ultimate Load Analysis of Prestressed High-strength Concrete Beam[J].China Journal of High-way and Transport,2006,19(1):58-61.
[6]邵长江,吴永红,钱永久.混凝土桥梁结构非线性地震损伤演化[J].中国公路学报,2006,19(5):41-45.SHAO Chang-jiang,WU Yong-hong,QIAN Yong-jiu.Evolution of Nonlinear Seismic Damage of Con-crete Bridge Structure[J].China Journal of Highwayand Transport,2006,19(5):41-45.
[7]朱劲松,宋玉普.定侧压混凝土双轴拉-压疲劳累积损伤试验研究[J].中国公路学报,2005,18(1):40-45.ZHU Jin-song,SONG Yu-pu.Experimental Researchon Fatigue Cumulative Damage of Concrete UnderCyclic Tension-compression with Constant ConfinedStress[J].China Journal of Highway and Transport,2005,18(1):40-45.
[8]钟铭,王海龙,王海良.高强混凝土梁在疲劳荷载作用下的裂缝宽度计算[J].中国公路学报,2005,18(4):48-53.ZHONG Ming,WANG Hai-long,WANG Hai-liang.Calculation of Crack Width of High-strength Con-crete Beams Under Fatigue Loading[J].China Journalof Highway and Transport,2005,18(4):48-53.
[9]林皋,李建波,赵娟,等.单轴拉压状态下混凝土破坏的细观数值演化分析[J].建筑科学与工程学报,2007,24(1):1-6.LIN Gao,LI Jian-bo,ZHAO Juan,et al.MesoscopicNumerical Evolution Analysis of Concrete DamageUnder Uniaxial Tension and Compression[J].Journalof Architecture and Civil Engineering,2007,24(1):1-6.
[10]宋玉普.多种混凝土材料的本构关系和破坏准则[M].北京:中国水利水电出版社,2002.SONG Yu-pu.Constitutive Relation and Failure Cri-terion of Multiple Concrete Material[M].Beijing:China Water Conservancy and Electric Power Press,2002.
[11]过镇海.混凝土的强度和变形——试验基础和本构关系[M].北京:清华大学出版社,1997.GUO Zhen-hai.Strength and Distortion of Concrete:Test Basis and Constitutive Relation[M].Beijing:Ts-inghua University Press,1997.
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