细观尺度下混凝土非线性徐变数值模拟  

Numerical Simulations of Nonlinear Creep of Concrete at Mesoscale

作　　者：潘钻峰[1] 李浩博 潘昊瑾 PAN Zuanfeng;LI Haobo;PAN Haojin(College of Civil Engineering,Tongji University,Shanghai 200092,China;WISDRI Engineering&Research Inc.Ltd.,Wuhan 430223,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]中冶南方工程技术有限公司,武汉430223

出　　处：《工业建筑》2024年第10期84-93,共10页Industrial Construction

基　　金：国家重点研发计划项目(2022YFC3801800)。

摘　　要：为了预测混凝土的非线性徐变,需要建立合理的混凝土细观有限元模型。从混凝土非线性徐变的计算方法和原理出发,采用ABAQUS有限元分析软件并通过二次开发构建了考虑骨料、砂浆基质及界面过渡区的细观三相混凝土数值模型。研究提出了“骨料放缩法”以在二相有限元模型中生成均匀的界面过渡区,并用于后续建立三相模型。在考虑线性徐变的基础上引入损伤引起的应变增量,可有效模拟非线性徐变效应。细观三相混凝土数值模型成功模拟了混凝土的复杂细观结构,并通过递推公式计算了混凝土徐变,对混凝土在持荷后应变变化的模拟效果良好。最后通过已有混凝土圆柱体和棱柱体试件的徐变试验数据验证了模型的准确性。In order to predict the nonlinear creep of concrete,it is necessary to establish a reasonable meso-finite element model of concrete.Base on the computational methods and principles of nonlinear creep in concrete,a mesoscale three-phase numerical model of concrete,which considering aggregates,cement paste,and the interfacial transition zone,was developed by using ABAQUS finite element analysis software through secondary development.The“aggregate scaling method”was proposed to generate a uniform interface transition zone in the two-phase finite element model,which was subsequently used to establish a three-phase model.By introducing strain increments caused by damage based on linear creep,the nonlinear creep effect was effectively simulated.The mesoscale three-phase numerical model of concrete successfully simulated the complex mesoscale structure of concrete and computed creep behavior by using recursive formulas,demonstrating good performance in simulating strain changes in concrete under sustained loads.Finally,the accuracy of the model was validated through existing creep test data from concrete cylindrical and prismatic specimens.

关 键 词：混凝土 非线性徐变 ABAQUS 二次开发 细观模拟 三相模型 

分 类 号：TU528[建筑科学—建筑技术科学]