[1]苗艳春,张玉,雷闯,等.热力耦合途径下再生保温混凝土的细观力学性能[J].郑州大学学报(工学版),2021,42(05):79-85.[doi:10.13705/j.issn.1671-6833.2021.05.003]
　MIAO Yanchun,ZHANG Yu,LEI Chuang,et al.Meso-scale Response of Recycled Aggregate Thermal Insulation Concrete Based on Coupled Thermo-mechanical Modeling[J].Journal of Zhengzhou University (Engineering Science),2021,42(05):79-85.[doi:10.13705/j.issn.1671-6833.2021.05.003]

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热力耦合途径下再生保温混凝土的细观力学性能()

分享到：

《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:

42

期数:

2021年05期

页码:

79-85

栏目:

出版日期:

2021-09-10

文章信息/Info

Title:

Meso-scale Response of Recycled Aggregate Thermal Insulation Concrete Based on Coupled Thermo-mechanical Modeling

作者:

苗艳春; 张玉; 雷闯; 李明厚; 刘元珍; 李珠

太原理工大学土木工程学院;华南理工大学亚热带建筑科学国家重点实验室;

Author(s):

MIAO Yanchun1;  ZHANG Yu1; 2;  LEI Chuang1;  LI Minghou1;  LIU Yuanzhen1;  LI Zhu1

School of Civil Engineering of Taiyuan University of Technology; National Key Laboratory of South China University of Technology Asian Tropical Sciences;

关键词:

再生保温混凝土; 随机骨料模型; 热力耦合; 热传导; 单轴受压; 高温

Keywords:

RATIC;  random aggregate model;  coupled thermo-mechanical;  heat conduction;  uniaxial compression;  high temperature

DOI:

10.13705/j.issn.1671-6833.2021.05.003

文献标志码:

A

摘要:

基于Monte Carlo方法，本文借助MATLAB软件生成了再生保温混凝土（RATIC）二维多边形随机骨料模型，利用ABAQUS有限元分析软件对热-力耦合途径下的再生保温混凝土进行细观尺度损伤模拟。由于RATIC的表征非均质特性，充分考虑了砂浆、再生粗骨料、界面过渡区和玻化微珠在不同温度下的热膨胀系数、热传导率和比热容等热工参数以及泊松比、抗压强度和弹性模量等力学参数，给界面过渡区和砂浆基体添加了相应于不同温度的RATIC塑性损伤参数，对比分析了RATIC相应于不同受火温度的破坏荷载和加载时间下的损伤分布情况，以进一步揭示高温下RATIC的单轴受压破坏过程和力学性能。

Abstract:

Based on the meso-scale heterogeneity of recycled aggregate thermal insulation concrete (RATIC), MATLAB software was used to generate a 2-D polygonal random aggregate model of RATIC by Monte Carlo method, and then the finite element analysis software ABAQUS was used to simulate the uniaxial compression mechanical properties of meso-scale RATIC based on coupled thermo-mechanical modeling. Firstly, the heat conduction behavior of RATIC at different temperatures was simulated. According to the simulation results, the effects of meso-scale constituents at different temperatures (100, 200, 300, 400, 500, 600, 700 and 800 ℃), such as the thermal parameters (conductivity, specific heat and thermal expansion coefficient) and the mechanical parameters (strength, elastic model and Poisson′s ratio), on the meso-scale RATIC mechanical properties were explored. Furthermore, a comparative analysis was conducted to study the uniaxial compression failure modes at different fire temperatures of RATIC under simulated and experimental conditions. The results show that the temperature stress weakens the strength of RATIC when the temperature exceeds 400 ℃. And at 800 ℃, there is a maximum temperature stress of 3.309 MPa generated inside the specimen. The high temperature damage of RATIC specimens under uniaxial compression first appears in the interfacial transition zone, and then develops to the mortar. It is mainly concentrated on the free end of the specimen, and with the increase of the fire temperature and loading time, the damage shows a gradual increase trend. The results indicate that the meso-scale model can be well used to simulate the uniaxial compression mechanical properties and failure patterns of RATIC at high temperature.

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