[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(5):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(5):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()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
42
期数:
2021年5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1,张玉1,2,雷闯1,李明厚1,刘元珍1,李珠1
1.太原理工大学 土木工程学院，山西 太原 030024；2.华南理工大学 亚热带建筑科学国家重点实验室，广州 广东 510640
Author(s):
MIAO Yanchun1, ZHANG Yu1,2, LEI Chuang1, LI Minghou1, LIU Yuanzhen1, LI Zhu1
1.College of Civil Engineering， Taiyuan University of Technology， Taiyuan 030024， China； 2.State Key Laboratory of Subtropical Building Science， South China University of Technology， Guangzhou 510640， China
关键词:
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:
结合再生保温混凝土(RATIC)的表征非均质特性,基于 Monte Carlo 方法,借助 MATLAB 软件生成了 RATIC 二维多边形随机骨料模型,并利用 ABAQUS 有限元分析软件对热力耦合途径下的 RATIC 进行了单轴受压损伤模拟。 首先对不同温度下 RATIC 的热传导行为进行模拟分析,基于温度场模拟结果,利用混凝土塑性损伤本构模型分别探究 100、200、300、400、500、600、700、800 ℃下各细观组分的热膨胀系数、热传导率和比热容等热工参数以及泊松比、强度和弹性模量等力学参数的差异性对 RATIC 细观力学性能的影响,并进一步对比分析了模拟和试验条件下 RATIC 在不同受火温度下的单轴受压破坏形态。 结果表明:当受火温度超过 400 ℃时,温度应力对 RATIC 强度产生了削弱作用,800 ℃时,试件内部产生了最大的温度应力 3.309 MPa；高温下单轴受压的 RATIC 试件损伤首先出现于界面过渡区,然后向砂浆基体发展,其主要集中于试件的自由端,且随着受火温度和加载时间的提高,损伤均呈现出逐渐加剧的趋势,细观损伤模型可以较好地模拟高温下 RATIC 的单轴受压力学性能和破坏形态。
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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更新日期/Last Update: 2021-10-11