基于粘结单元的三维随机细观混凝土离散断裂模拟  

THREE-DIMENSIONAL MESO-SCALE COHESIVE FRACTURE MODELING OF CONCRETE USING A PYTHON SCRIPT IN ABAQUS

作　　者：杨贞军 黄宇劼 尧锋 刘国华[2] YANG Zhen-jun;HUANG Yu-jie;YAO Feng;LIU Guo-hua(Hubei Province Key Laboratory of Geotechnical and Structural Safety,School of Civil Engineering,Wuhan University,Wuhan,Hubei 433000,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou,Zhejiang 310058,China)

机构地区：[1]武汉大学土木建筑工程学院,湖北省岩土与结构安全重点实验室,武汉湖北433000 [2]浙江大学建筑工程学院,杭州浙江310058

出　　处：《工程力学》2020年第8期158-166,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51779222,51974202)。

摘　　要：开发MATLAB和ABAQUS Python脚本程序,建立含随机三维多面体骨料的混凝土细观有限元模型。通过自编高效C++程序插设三维零厚度的粘结界面单元,以模拟复杂三维离散多裂缝的起裂与扩展。对典型混凝土试件单轴拉伸断裂的模拟,分析粘性界面单元的主要材料参数(抗拉强度与断裂能)对应力-位移曲线、断裂过程、裂缝面特征的影响。结果表明:宏观应力-位移曲线主要受砂浆、界面粘性裂缝单元的抗拉强度、断裂能绝对数值的影响;裂缝面的位置与形态决定于砂浆、界面粘结裂缝单元的抗拉强度相对比值以及断裂能相对比值;混凝土的力学响应反映其裂缝发展特征,二者既决定于断裂材料参数,也受到骨料大小、形状等细观结构因素的影响;建立的有限元模型能有效描述混凝土复杂三维断裂过程。The meso-finite element model of concrete with random three-dimensional polyhedral aggregate is firstly established by developing MATLAB and ABAQUS Python script programs.A highly efficient C++program is then developed to insert 3D cohesive elements with zero-thickness into the aggregate-mortar interfaces and within the mortar matrix,to realistically simulate their complicated crack initiation and propagation.Parametric studies are carried out to investigate the influence of cohesive fracture properties on the load-carrying capacity and cracking process.The simulation results show that:the macroscopic stress-displacement curve is mainly affected by the tensile strength and fracture energy of mortar and interface viscous crack unit,and the position and shape of crack surface are determined by the relative ratio of tensile strength and fracture energy of mortar and interface bonded crack unit.The mechanical response of concrete reflects the characteristics of crack development,which are not only determined by fracture material parameters,but also affected by meso-structural factors such as aggregate size and shape.The meso-structural features of aggregates also have significant effects on the complicated 3D cracking process.

关 键 词：有限元法 混凝土细观模拟 断裂 粘性裂缝 Python脚本程序 ABAQUS 

分 类 号：TU528[建筑科学—建筑技术科学]