高压物理学报2016，Vol.30Issue(3)：191-199,9.DOI:10.11858/gywlxb.2016.03.003
二维骨料随机分布混凝土的动态力学性能数值模拟
Numerical Simulation of Dynamic Mechanical Behavior of Concrete with Two-dimensional Random Distribution of Coarse Aggregate
摘要
Abstract
With concrete regarded as a two-phase non-homogeneous composite material consisting of coarse aggregate and cement mortar and on the basis of Fuller gradation curve and Walaraven plane conversion formula,a two-dimensional circular aggregate random distribution program of the concrete was designed to simulate the dynamic response of the concrete subjected to impact loading.The influences of impact velocity,specimen dimension,size and distribution of coarse aggregate and volume fraction of coarse aggregate on the dynamic mechanical behavior of the concrete were analyzed,and the impact failure mode of the concrete was also discussed.The regulations of impact velocity,specimen dimension,size and distribution of coarse aggregate and volume fraction of coarse aggregate on the dynamic mechanical behaviors of the concrete were presented.Our numerical simulation shows that the peak stress of the concrete increases with the impact velocity,and thus the concrete is rate-dependent.With the enhancement of the specimen dimension,the peak stress of the concrete decreases,so the concrete produces an obvious size effect.With the volume fraction of coarse aggregate,the peak stress of the concrete increases at first and then declines.When the volume fraction of coarse aggregate equal to 40 ％,the peak stress of the concrete reaches its maximum value.With the increase of the minimum diameter of coarse aggregate,the peak stress of the concrete declines.However,with the increase of the maximum diameter of coarse aggregate,the peak stress of the concrete increases initially and then declines,which provides a theoretical guidance and technical support for the engineering application of the concrete.关键词
混凝土/动态力学性能/随机分布/尺寸效应/数值模拟Key words
concrete/dynamic mechanical behavior/random distribution/size effect/numerical simulation分类
数理科学引用本文复制引用
刘海峰,韩莉..二维骨料随机分布混凝土的动态力学性能数值模拟[J].高压物理学报,2016,30(3):191-199,9.基金项目
国家自然基金(11162015,51368048) （11162015,51368048）
教育部“长江学者和创新团队发展计划”创新团队项目(IRT1067) （IRT1067）
