混凝土压缩断裂过程及尺寸效应的数值模拟
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摘要
将混凝土视为由骨料、水泥砂浆及二者间的粘结带所构成的三相复合材料,利用蒙特卡罗方法生成混凝土随机骨料模型。在此基础上,采用双折线损伤演化模型描述混凝土细观各相单元的损伤退化。利用非线性有限元方法对湿筛、三级配、四级配混凝土试件的单轴受压破坏过程进行了数值分析,从而对试件的抗压强度进行了尺寸效应分析。研究结果表明,数值模拟所得的结果与试验结果表现出较好的一致性,混凝土的断裂主要发生在骨料与砂浆的粘结面上,裂纹沿平行于最大压应力的方向扩展。
The concrete is considered as a three-phase composite composed of matrix,aggregate and interface between them,and its mesoscale structure is represented with random aggregate model by using Monte-Carlo method.Then,the bilinear damage evolution model is adopted to describe the meso-element's damage degradation,and the failure mechanism of wet screened,three-graded,four-graded concrete specimens under uniaxial compression is simulated with nonlinear finite element method.Furthermore,size effect on the strength is analyzed in the paper.The results show that the numerical solutions are fitted with experiment results, and the fracture of concrete is generally generated along the bond between aggregate and matrix,Cracks are extended in a direction parallel to the maximum compression stress.
The concrete is considered as a three-phase composite composed of matrix,aggregate and interface between them,and its mesoscale structure is represented with random aggregate model by using Monte-Carlo method.Then,the bilinear damage evolution model is adopted to describe the meso-element's damage degradation,and the failure mechanism of wet screened,three-graded,four-graded concrete specimens under uniaxial compression is simulated with nonlinear finite element method.Furthermore,size effect on the strength is analyzed in the paper.The results show that the numerical solutions are fitted with experiment results, and the fracture of concrete is generally generated along the bond between aggregate and matrix,Cracks are extended in a direction parallel to the maximum compression stress.
引文
1 DL/T 5150-2001水工混凝土试验规程
2侯顺载,李金玉,曹建国,等.高拱坝全级配混凝土动态试验研究.水力发电,2002(1):51-53
3刘文彦,谢年祥.东江拱坝全级配混凝土力学性能的试验研究.水力发电,1986(5):8-14
4 Lilliu G,J G M Van Mier.3D Lattice Type Fracture Model forConcrete.Engineering Fracture Mechanics,2003,70:927-941
5 Bazant Z P,Tabbara M R.Random Particle Models for Fracture ofAggregate or Fiber Composites.Journal of Engineering Mechanics,1990,116:1 686-1 705
6 Mohamed A R,Hansen W.Micromechnical Modelling of ConcreteResponse Under Static Loading-Part I:Model Development andValidation.ACI Materials Journal,1999,96(2):196-203
7唐春安,朱万成.混凝土损伤与断裂-数值试验.北京:科学出版社,2003
8刘光廷,王宗敏.用随机骨料模型数值模拟混凝土材料的断裂.清华大学学报,1996,36(1):84-89
9 Walaraven J C,Reinhardt H W.Theory and Experiments on theMechanical Behavior of Cracks in Plain and Reinforced ConcreteSubjected to Shear Loading.HERON,1991,26(1A):23-33
10张安哥,朱成九,陈梦成.疲劳、断裂与损伤.成都:西南交通大学出版社,2005:114-117
11马怀发,陈厚群,黎保琨.预静载作用下混凝土梁的动弯拉强度.中国水利水电科学研究院学报,2005,3(3):168-178
12杨成球,吴政.全级配混凝土单轴受压应力-应变全曲线试验研究.水电站设计,1997,13(2):8-12
13高拱坝地震应力控制标准和抗震结构工程措施研究-高拱坝全级配混凝土动态性能试验研究.北京:中国水利水电科学研究院,2000:6-28
14成都勘测设计院.高混凝土坝设计计算方法与设计准则.成都:成都勘测设计院,1990:157-180
15于骁中,曹建国,郭桂兰.混凝土的二轴强度及其在拱坝设计中的应用//中国水利水电科学研究院科学研究论文集.北京:水利电力出版社,1984:17-23
16杨木秋,林泓.混凝土单轴受压受拉应力-应变全曲线的试验研究.水利学报,1992(6):60-66
17王仲华,陈如华.三峡大坝全级配混凝土力学性能试验研究.长江科学院院报,1998,15(1):1-5
2侯顺载,李金玉,曹建国,等.高拱坝全级配混凝土动态试验研究.水力发电,2002(1):51-53
3刘文彦,谢年祥.东江拱坝全级配混凝土力学性能的试验研究.水力发电,1986(5):8-14
4 Lilliu G,J G M Van Mier.3D Lattice Type Fracture Model forConcrete.Engineering Fracture Mechanics,2003,70:927-941
5 Bazant Z P,Tabbara M R.Random Particle Models for Fracture ofAggregate or Fiber Composites.Journal of Engineering Mechanics,1990,116:1 686-1 705
6 Mohamed A R,Hansen W.Micromechnical Modelling of ConcreteResponse Under Static Loading-Part I:Model Development andValidation.ACI Materials Journal,1999,96(2):196-203
7唐春安,朱万成.混凝土损伤与断裂-数值试验.北京:科学出版社,2003
8刘光廷,王宗敏.用随机骨料模型数值模拟混凝土材料的断裂.清华大学学报,1996,36(1):84-89
9 Walaraven J C,Reinhardt H W.Theory and Experiments on theMechanical Behavior of Cracks in Plain and Reinforced ConcreteSubjected to Shear Loading.HERON,1991,26(1A):23-33
10张安哥,朱成九,陈梦成.疲劳、断裂与损伤.成都:西南交通大学出版社,2005:114-117
11马怀发,陈厚群,黎保琨.预静载作用下混凝土梁的动弯拉强度.中国水利水电科学研究院学报,2005,3(3):168-178
12杨成球,吴政.全级配混凝土单轴受压应力-应变全曲线试验研究.水电站设计,1997,13(2):8-12
13高拱坝地震应力控制标准和抗震结构工程措施研究-高拱坝全级配混凝土动态性能试验研究.北京:中国水利水电科学研究院,2000:6-28
14成都勘测设计院.高混凝土坝设计计算方法与设计准则.成都:成都勘测设计院,1990:157-180
15于骁中,曹建国,郭桂兰.混凝土的二轴强度及其在拱坝设计中的应用//中国水利水电科学研究院科学研究论文集.北京:水利电力出版社,1984:17-23
16杨木秋,林泓.混凝土单轴受压受拉应力-应变全曲线的试验研究.水利学报,1992(6):60-66
17王仲华,陈如华.三峡大坝全级配混凝土力学性能试验研究.长江科学院院报,1998,15(1):1-5
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