摘要
本文基于蒙特卡罗方法和Fuller级配理论生成了含孔隙的三维混凝土细观几何模型,采用Mori-Tanaka的复合材料等效化方法将细观模型中的骨料、砂浆和孔隙水材料力学参数属性进行等效化处理.对不同饱和度混凝土进行三轴受压数值模拟,研究了饱和度、应变速率、初始应力等对混凝土三轴受压力学性能的影响.结果表明:相同初始应力和应变速率下,混凝土抗压强度、峰值应变随饱和度的增加呈线性下降趋势,弹性模量随饱和度的增加呈微弱的线性上升趋势;相同饱和度和初始应力下,混凝土抗压强度、弹性模量和峰值应变随应变速率的增加而增大;相同应变速率和饱和度下,随着初始应力增加,混凝土的抗压强度、弹性模量、峰值应变随之增大.
In this paper,based on Monte Carlo method and Fuller grading theory,a three-dimensional concrete meso geometric model with voids is generated.The mechanical parameter attributes of aggregate,mortar and pore water materials in the meso model are equivalent by Mori Tanaka's composite material equivalence method.The effects of saturation,strain rate and initial stress on the mechanical properties of concrete under triaxial compression were studied by numerical simulation of concrete with different saturation.The results show that under the same initial stress and strain rate,the compressive strength and peak strain of concrete show a linear decreasing trend with increasing saturation,while the elastic modulus shows a weak linear increasing trend with increasing saturation;Under the same saturation and initial stress,the compressive strength,elastic modulus,and peak strain of concrete increase with the increase of strain rate;Under the same strain rate and saturation,as the initial stress increases,the compressive strength,elastic modulus,and peak strain of concrete also increase.
作者
黄俊龙
王乾峰
张帅康
HUANG Junlong;WANG Qianfeng;ZHANG Shuaikang(College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China)
出处
《三峡大学学报（自然科学版）》
CAS
北大核心
2024年第2期79-84,97,共7页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金青年项目(51709155)。
关键词
混凝土
细观单元等效模型
饱和度
应变速率
数值模拟
concrete
meso element equivalent model
saturation
strain rate
numerical simulation
