摘要
针对现有混凝土结构设计研究未充分考虑细观尺度非均质性对宏观变形的影响机制,忽略了混凝土材料强度、骨料分布、界面性能等参数随机性的不足,在混凝土细观力学理论框架内,应用Hashi-Shtrikman变分法,推导得到的混凝土均匀化体积模量、剪切模量、弹性模量、泊松比的上下限表达式;将骨料和水泥砂浆的弹性模量、泊松比,粗骨料含量,构件所受竖向荷载、3个方向的尺寸视为随机变量,研究了混凝土材料力学指标、构件竖向变形及其概率分布。相关结论可为结构设计中的可靠度分析、内力重分布计算等相关内容提供理论依据。
Addresses the insufficiency in current concrete structure design research,which inadequately considers the influence mechanism of mesoscale heterogeneity on macroscopic deformation and neglects the randomness of parameters such as concrete material strength,aggregate distribution,and interface properties.Within the theoretical framework of mesomechanics of concrete,expressions for the upper and lower bounds of the homogenized bulk modulus,shear modulus,elastic modulus,and Poisson′s ratio of concrete are derived using the Hashin-Shtrikman variational method.Treating the elastic moduli and Poisson′s ratios of aggregate and cement mortar,coarse aggregate content,vertical load on the member,and dimensions in three directions as random variables,the mechanical indicators of the concrete material,the vertical deformation of the member,and their probability distributions are investigated.The relevant conclusions can provide a theoretical basis for reliability analysis and internal force redistribution calculations in structural design.
作者
方兴矗
蒋廷球
周泓霖
杨其龙
韦楼
杨旭
FANG Xingchu;JIANG Tingqiu;ZHOU Honglin;YANG Qilong;WEI Lou;YANG Xu(China Railway Fourth Bureau Group Fifth Engineering Co.,Ltd.,Jiujiang 332000,China;Guangxi Liuwu Railway Co.,Ltd.,Nanning 530000,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)
出处
《混凝土》
北大核心
2025年第10期72-78,共7页
Concrete
基金
国家自然科学基金青年项目(52008135)
黑龙江省自然科学基金优秀青年项目(YQ2024E029)
铁路T梁智能建造技术项目(中铁四五-LWZQ-3标-技-24)。
关键词
细观力学
均匀化方法
混凝土
mesomechanics
homogenization method
concrete
