混凝土湿度和干缩变形及应力特性的细观模型分析  

Analysis of concrete moisture dry shrinkage and stress based on mesoscopical model

作　　者：朱岳明[1] 刘有志[1] 曹为民[2] 吴健[2] 

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]水利部南水北调工程建设委员会,北京100038

出　　处：《水利学报》2006年第10期1163-1168,共6页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助项目(50579080;50539010);水利部科技创新基金资助项目(SCXC2003-10);河海大学院士学科发展基金资助项目(HHUYS003)

摘　　要：基于扩散理论的混凝土非线性湿度理论和干缩应力的有限元数值计算方法,将混凝土视为砂浆和骨料所组成的多相复合材料,对比数值计算,探讨了各相材料湿度特性差异对混凝土细观和宏观湿度特性、干缩变形和干缩应力的影响,认为只有考虑了这种材料特性差异的细观模型和计算方法才能得到较符合真实情况的混凝土湿度、干缩和干缩应力的分布规律,有助于更好地理解和诊断混凝土早期和后期裂缝产生的机理、启裂点位置和防止方法。所采用的细观研究方法也适用于混凝土温度应力和自生体积变形致裂问题的研究。Based on non-linear moisture of diffusion theory and numerical FEM calculation method for dry shrinkage stress, concrete is assumed to be a three-phase material composite including matrices, aggregates and aggregate-matrix interfaces. The macroscopical and mesoscopical moisture properties of concrete composite depend on the relevant characteristics of the different phases. Numerical results of the dry shrinkage and stress related are compared when the difference of material characteristics between matrices and aggregates has been considered or not. The distributions of moisture, drying shrinkage and dry stress are obtained more reasonably and realistically by using the mesoscopical model and calculation method considering the different characteristics of the material phases. It is benefited for us to understand the cracking mechanism, location of the initial cracking and the suitable measures for preventing cracks occurring at early and later ages. Besides, the present mesoscopical study is also suitable to study crack phenomenon induced by other reasons such as thermal load and autogenous shrinkage.

关 键 词：混凝土 多相复合材料 湿度 干缩 应力 开裂 细观模型 细观分析 

分 类 号：TV431[水利工程—水工结构工程]