基于细观力学的混凝土数值模型研究  

Study on numerical model of concrete based on 3D meso-mechanics

作　　者：梁昕宇[1] 党发宁[1] 田威[2] 陈厚群[1,3] 

机构地区：[1]西安理工大学,西安710048 [2]长安大学,西安710061 [3]中国水利水电科学研究院工程抗震中心,北京100044

出　　处：《应用力学学报》2011年第2期129-134,212,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50879069;51009010);水利部公益性行业科研专项(2007SHZ1-200701004);西安理工大学优博基金(106-210909)

摘　　要：详细分析了界面单元模型、接触面单元模型、CT图像三维重建模型三种细观混凝土数值模型的优缺点,并将数值计算结果与物理试验结果进行了对比。结果表明:混凝土接触面模型克服了界面单元模型中的界面层太厚、计算单元多、计算速度慢的弊端,且解决了原模型裂纹空洞区大的问题;而CT图像三维重建模型与实际物理模型能够一一对应,可以弥补传统随机混凝土骨料模型的不足。不仅可以使混凝土数值模型更接近于实际物理模型,而且可以较好地反映出了混凝土材料内部的力学特性。CT三维重建模型可为最终能够深入研究混凝土材料的细观破损机理开辟新的途径。This paper introduces the meso-concrete numerical model,analyzes in detail advantages and disadvantages of the interface mesh model,the contact-face mesh model and the 3-D reconstruction model based on CT image,and compares the results by numerical simulation and with the ones by physical experiment.The results show that the contact-face mesh model overcomes the following shortages of the interface mesh model: the larger thickness of the interface,the larger number of element,the slower calculation speed,and the wider hole-zone of crack.On the other hand,the 3-D reconstruction model based on CT image is in one-to-one correspondence with Physical Model,which overcomes the shortage of traditional Random Aggregate Model and makes concrete numerical model to be more close to the actual physical model,and reflects better the mechanical properties of concrete materials.It provides a new approach to study the meso-damage-fracture mechanism of concrete.

关 键 词：细观混凝土 数值模型 细观损伤 CT 

分 类 号：TV148[水利工程—水力学及河流动力学]