基于Python-ABAQUS的三维细观凹凸骨料建模及骨料不同形状影响分析  

3D Concave-convex Aggregate Modeling Based on Python-ABAQUS and Influence Analysis of Different Shapes of Aggregates

作　　者：孙茂增 朱吉鹏 SUN Mao-zeng;ZHU Ji-peng(School of Physics,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学物理学院,南京210094

出　　处：《科学技术与工程》2024年第23期10022-10031,共10页Science Technology and Engineering

基　　金：国家自然科学基金面上项目(51578290)。

摘　　要：为了探究混凝土内部细观尺度下的损伤机理,利用Python语言对ABAQUS进行二次开发,建立了包含界面过渡区的三维细观凹凸型骨料混凝土模型,并提出了一种可直接用于判断凹凸型骨料空间干涉的方法。随后,对该模型进行准静态下的数值模拟,以验证其可靠性。最后,进行了不同骨料形状下的单轴压缩数值模拟分析。研究结果表明,采用本方法可以实现60%以上的骨料体积比的高密实投放。在不同形状的骨料下,混凝土的抗压强度方面影响不大;然而,在导致混凝土裂缝扩展与体积破坏方面,不同形状的骨料产生较大影响。随着骨料表面凹凸性和不规则程度的增加,混凝土受压时的损伤破坏程度逐步加深。这些发现有助于更深入地理解混凝土内部损伤机理,并为混凝土结构设计提供了有益的参考。To explore the internal damage mechanisms of concrete at the meso-scale level,ABAQUS was conducted secondary development using the Python language.A three-dimensional meso-scale model of concrete with concave-convex aggregates,including the interfacial transition zone,was established.Additionally,a method for directly determining spatial interference of concave-convex aggregates was proposed.Subsequently,the model underwent numerical simulations under quasi-static conditions to validate its reliability.Finally,numerical simulations of uniaxial compression were performed for different aggregate shapes.The results indicate that this method can achieve high-density placement with an aggregate volume fraction of over 60%.The influence on concrete compressive strength is minimal for different aggregate shapes.However,significant effects were observed in terms of inducing crack propagation and volumetric failure in concrete.As the surface concavity-convexity and irregularity of aggregates increase,the degree of compressive damage and failure in concrete progressively deepens.These findings contribute to a more profound understanding of internal damage mechanisms in concrete,providing valuable insights for the design of concrete structures.

关 键 词：三维细观模型 凹凸型骨料 PYTHON 干涉判断 骨料形状 

分 类 号：TU528[建筑科学—建筑技术科学]