基于黏聚力单元的热力耦合作用下细观混凝土数值模拟  

Numerical Simulation of Meso-concrete Under Thermo-mechanical Coupling Based on Cohesive Elements

作　　者：李林[1] 刘勇[1] 魏珍中[1] 马小敏 雷建银 Li Lin;Liu Yong;Wei Zhenzhong;Ma Xiaomin;Lei Jianyin(Shandong Electric Power Engineering Consulting Institute Co.,Ltd.,Jinan 250013,China;Institute of Applied Mechanics,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]山东电力工程咨询院有限公司,济南250013 [2]太原理工大学应用力学研究所,太原030024

出　　处：《科技通报》2025年第3期70-76,92,共8页Bulletin of Science and Technology

基　　金：国家自然科学基金项目(12202303)。

摘　　要：基于Python和ABAQUS联合仿真方法,本文采用二维混凝土细观模型,实现了单轴拉伸断裂模拟以及热力耦合作用下热传导的数值模拟。介绍了采用Python脚本进行混凝土随机骨料高效建模的方法、黏聚力(cohesive)单元的参数设置以及基于cohesive单元的热力耦合实现方法。分析骨料体积分数对混凝土准静态单轴拉伸弹性模量、强度及内能的影响,并讨论了不同温度荷载、骨料形状对混凝土弹性模量的影响,以及骨料分布随机性对导热性能的影响。结果表明:随着温度荷载的升高,混凝土的弹性模量降低;骨料的空间随机分布使混凝土导热性能产生随机性;骨料形状对热力耦合作用下混凝土的弹性模量影响不大。该方法为混凝土领域的热力耦合研究提供了高效的数值模拟方案。Based on the Python and ABAQUS co-simulation methods,the two-dimensional concrete mesoscopic model was used to realize the uniaxial tensile fracture simulation and the numerical simulation of heat conduction under thermos-mechanical coupling.In this paper,the method of efficient modeling of concrete random aggregate using Python script,the parameter setting of cohesive element and the implementation method of thermo-mechanical coupling based on cohesive element are introduced.The effects of aggregate volume fraction on the elastic modulus,strength and internal energy of concrete under the quasi-static uniaxial tensile were analyzed,and the effects of different temperature loads,aggregate shape on the elastic modulus of concrete,and the influence of aggregate distribution randomness on thermal conductivity were discussed.The results show that the elastic modulus of concrete decreases with the increase of temperature load;the spatial random distribution of aggregate makes the randomness of the thermal conductivity of concrete;and the shape of aggregate has little effect on the elastic modulus of concrete under thermos-mechanical coupling.This method provides an efficient numerical simulation scheme for the study of thermo-mechanical coupling in the field of concrete.

关 键 词：混凝土细观模型 热力耦合 黏聚力单元 导热性能 

分 类 号：TU258.01[建筑科学—建筑设计及理论]