摘要
目的研究湿筛混凝土、全级配混凝土的抗拉强度,进一步掌握混凝土的细观结构与宏观力学性能间的关系.方法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.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一级配混凝土试件的轴拉实验进行了数值分析;在二级配混凝土试件的轴拉实验中验证了均匀化的正确性;在全级配混凝土轴拉实验中应用了均匀化方法.结果得到一级配混凝土的抗拉强度为2.5 MPa,二级配混凝土的抗拉强度为1.96 MPa,四级配混凝土的抗拉强度为1.72 MPa.结论采用均匀化方法预测全级配混凝土的宏观力学性能是可行的.数值模拟所得的结果与实验结果表现出较好的一致性.
In order to get the tensile strength of wet screened,three-graded,fully-graded concrete the concrete is considered as a three-phase composite composed of matrix,aggregate and the interface between the two;the random aggregate model is conctructed by using Monte-Carlo method.The bilinear damage evolution model is adopted to describe the meso-element＇s damage devolution.The axial tension test for the one-graded concrete is studied by the nonlinear FEM;homogenization is verified in the axial tension test for the two-graded concrete;homogenization is applied in the axial tension test for the fully-graded concrete.Furthermore,tensile strengths of fully-graded concrete.The results of numerical simulation meet experiment results well.
出处
《沈阳建筑大学学报（自然科学版）》
EI
CAS
2007年第5期742-746,共5页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(50325826
90510011)
北京市教育委员会科学技术与研究生建设项目(4700001401509)
北京市属市管高校人才教计划项目(05004012200515)
关键词
均匀化
数值混凝土
随机骨料模型
单轴拉伸
homogenization
numerical concrete
random aggregate modal
axial tension
