摘要
考虑混凝土材料各相组分特征,建立了细观层次有限元分析方法,模拟了不同尺寸几何相似混凝土试块在室温及低温下的静态单轴压缩破坏响应,探讨了低温下混凝土单轴压缩名义强度退化行为及尺寸效应影响规律.研究结果表明,随着温度的下降,单轴压缩名义强度显著增强,混凝土脆性不断增大,尺寸效应行为更显著.当温度达到−120℃时,混凝土材料的压缩强度和脆性达到最大,表现出最明显的尺寸效应.随着温度的继续下降,压缩强度略有小幅度的下降.经典的Type-2尺寸效应律在不同温度下可以描述本文有限元分析得到的尺寸效应结果.
Considering the characteristics of concrete mesocomponents,a mesoscale finite element analysis method is proposed in this paper.The static uniaxial compressive response of geometrically similar concrete cubes with different structural sizes at room and cryogenic temperatures is simulated.The degradation behavior of nominal strength of concrete under uniaxial compression at cryogenic temperature and the corresponding size effect are discussed.The results showed that as temperature decreases,the uniaxial nominal compressive strength significantly increases,the brittleness of concrete increases,and the size effect becomes more obvious.When the temperature reaches−120°C,the compressive strength and brittleness of concrete are the highest,exhibiting the strongest size effect.As the temperature is decreased further,the compressive strength decreases slightly within a narrow range.The classical Type-2 size effect law can describe the size effect results obtained using the finite element analysis at different temperatures.
作者
余文轩
金浏
张仁波
杜修力
YU WenXuan;JIN Liu;ZHANG RenBo;DU XiuLi(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2021年第3期305-314,共10页
Scientia Sinica(Technologica)
基金
国家自然科学基金(批准号:51822801)
国家重点研发计划(编号:2018YFC1504302)资助项目。
关键词
混凝土
尺寸效应
有限元分析
细观尺度
压缩强度
低温
concrete
size effect
finite element analysis
mesoscale
compressive strength
cryogenic temperature
