摘要
为研究试件尺寸、界面过渡区(ITZ)厚度及强度、沙漠砂替代率(DSRR)对沙漠砂混凝土(DSC)经历高温后抗压强度的影响,将DSC看作三相复合材料,建立含ITZ随机分布多边形骨料有限元模型,利用ANSYS对高温后DSC单轴受压破坏过程进行数值模拟。结果表明:模拟结果与试验结果误差在-2.59%~3.13%,吻合良好。高温后DSC抗压强度随试件尺寸增大而减小,强度下降范围为1.44%~4.13%;抗压强度随ITZ厚度增加呈逐渐减小趋势;随着ITZ强度增加,抗压强度基本呈线性增大趋势;抗压强度在DSRR为40%时最优,研究结果可为DSC工程应用提供理论依据。
To study the effects of specimen size,interface transition zone(ITZ)thickness and strength,and desert sand replacement ratio(DSRR)on the compressive strength of desert sand concrete(DSC)after experiencing high temperature,the DSC was considered as a three-phase composite material and a finite element model with ITZ randomly distributed polygonal aggregate was developed.Numerical simulation of the uniaxial compression damage process of DSC after high temperature was performed using ANSYS.The results show that the simulation results are in good agreement with the experimental results with errors ranging from-2.59%to 3.13%.The compressive strength of DSC decreases with the increase of specimen size after high temperature,and the strength decreases in the range of 1.44%to 4.13%.The compressive strength gradually decreases with the increase of ITZ thickness.The compressive strength basically increases linearly with the increase of ITZ strength.The compressive strength is optimal when the DSRR is 40%,and the research results can provide the theoretical basis for DSC engineering applications.
作者
刘海峰
陶仁光
吕晓晔
LIU Haifeng;TAO Renguang;LÜXiaoye(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)
出处
《混凝土》
CAS
北大核心
2024年第3期68-73,77,共7页
Concrete
基金
国家自然科学基金(52168034,11162015)
宁夏自然科学基金(2020AAC03044)
宁夏高等学校一流学科建设(水利工程学科)资助项目(NXYLXK 2021A03)。
关键词
界面过渡区
沙漠砂混凝土
多边形骨料
高温
数值模拟
interface transition zone
desert sand concrete
polygonal aggregate
high temperature
numerical simulation
