基于2D随机骨料模型的C80混凝土参数分析  

Parameters analysis of C80 concrete based on 2D random aggregate model

作　　者：吴洪梅 申波[1,2] 刘凯 卢亚琴 杨方[3] WU Hongmei;SHEN Bo;LIU Kai;LU Yaqin;YANG Fang(Research Center of Space Structures,Guizhou University,Guiyang 550003,Guizhou,China;Key Laboratory of Structural Engineering of Guizhou Province,Guiyang 550003,Guizhou,China;School of Mining and Civil Engineering,Liupanshui Normal University,Liupanshui 553000,Guizhou,China)

机构地区：[1]贵州大学空间结构研究中心,贵州贵阳550003 [2]贵州大学贵州省结构工程重点实验室,贵州贵阳550003 [3]六盘水师范学院矿业与土木工程学院,贵州六盘水553000

出　　处：《建筑科学与工程学报》2023年第1期28-37,共10页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51468007);贵州省科技计划项目(黔科合基础[2018]1038)。

摘　　要：利用DIGIMAT和ABAQUS联合建立细观混凝土2D随机骨料模型,模拟了粗骨料的分布、形状、含量以及界面过渡区性能、孔隙率对C80高强度混凝土立方体抗压强度、轴心抗压强度、弹性模量和劈裂抗拉强度的影响,并将模拟结果与各参数对低强度混凝土的影响进行比较。结果表明:粗骨料的分布模式对混凝土的基本力学性能几乎没有影响,不同分布形式下混凝土立方体抗压强度最大相对误差为4.18%;不同形状的粗骨料对混凝土力学性能有着不同的影响,圆形和椭圆形状粗骨料的模拟结果与试验值更为接近;不同骨料含量下混凝土立方体抗压强度呈现出先减小后增大的趋势,轴心抗压强度则是先减小后增加再减小,劈裂抗拉强度在粗骨料含量为33%时达到最大值4.61 MPa,之后便逐渐降低;随着孔隙率的增加,混凝土立方体抗压强度、轴心抗压强度和弹性模量均逐渐减小,劈裂抗拉强度在孔隙率为1.5%时降低较多,孔隙率为2%时有所上升。The 2 D random aggregate model of meso-concrete was established by DIGIMAT and ABAQUS.The effects of the distribution,shape and content of coarse aggregate,the performance of interfacial transition zone and porosity on the cubic compressive strength,axial compressive strength,elastic modulus and splitting tensile strength of C80 high strength concrete were simulated.The simulation results were compared with the effects of various parameters on low strength concrete.The results show that the distribution pattern of coarse aggregate has little effect on the basic mechanical properties of concrete,and the maximum relative error of compressive strength of concrete cube with different distribution patterns is 4.18%.Different coarse aggregate shapes have different effects on the mechanical properties of concrete.The simulation results of circular and elliptical coarse aggregates are closer to the experimental values.The compressive strength of concrete cubes with different aggregate contents shows a trend of decreasing first and then increasing.The axial compressive strength decreases first,then increases and then decreases.The splitting tensile strength reaches a maximum of 4.61 MPa when the coarse aggregate content is 33%,and then gradually decreases.With the increase of porosity,the compressive strength,axial compressive strength and elastic modulus of concrete cube decrease gradually.The splitting tensile strength decreases more when the porosity is 1.5%,and increases when the porosity is 2%.

关 键 词：粗骨料 分布 形状 含量 界面过渡区 孔隙率 

分 类 号：TU528.31[建筑科学—建筑技术科学]