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基于细观尺度,将轻骨料混凝土看作由轻骨料、砂浆基质、两者之间的粘结界面层和气泡组成的四相复合材料。采用蒙特卡罗方法,随机生成轻骨料与气泡的位置和大小数据,在有限元计算软件ANSYS中建立二维的轻骨料随机分布数值模型,再将该模型导入ABAQUS中,在任意相连的两单元之间插入零厚度粘结单元,在单轴拉伸和压缩载荷作用下得到轻骨料混凝土数值试件的裂缝扩展路径及破坏形式。结果表明:通过该方法建立的数值模型,可模拟得出轻骨料混凝土试件的裂缝扩展路径,从而有助于在细观尺度上对轻骨料混凝土的力学性能进行深入研究。
Based on the meso-scale, lightweight aggregate concrete is considered as a four-phase composite material consisting of lightweight aggregate, mortar matrix, bonded interface layer and gas bubbles between the two. Monte Carlo method was used to generate randomly the position and size data of light aggregate and bubble. A two-dimensional numerical model of light weight random distribution was established in finite element software ANSYS. The model was then imported into ABAQUS. Zero-thickness bonding elements were inserted between the two elements to obtain crack propagation paths and failure modes of lightweight concrete specimens under uniaxial tensile and compressive loads. The results show that the crack growth path of lightweight aggregate concrete specimens can be simulated through the numerical model established by this method, which can be helpful to further study the mechanical properties of lightweight aggregate concrete at the mesoscopic scale.