[1]肖建庄,黄凯文,李龙.模型再生混凝土单轴受压静力与疲劳性能数值仿真[J].东南大学学报(自然科学版),2016,46(3):552-558.[doi:10.3969/j.issn.1001-0505.2016.03.016]
　Xiao Jianzhuang,Huang Kaiwen,Li Long.Numerical simulation on static force and fatigue behaviors of modeled recycled aggregate concrete under uniaxial compression[J].Journal of Southeast University (Natural Science Edition),2016,46(3):552-558.[doi:10.3969/j.issn.1001-0505.2016.03.016]
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模型再生混凝土单轴受压静力与疲劳性能数值仿真()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
46
期数:
2016年第3期
页码:
552-558
栏目:
材料科学与工程
出版日期:
2016-05-20

文章信息/Info

Title:
Numerical simulation on static force and fatigue behaviors of modeled recycled aggregate concrete under uniaxial compression
作者:
肖建庄; 黄凯文; 李龙
同济大学建筑工程系, 上海 200092
Author(s):
Xiao Jianzhuang;  Huang Kaiwen;  Li Long
Department of Structural Engineering, Tongji University, Shanghai 200092, China
关键词:
模型再生混凝土;  单轴受压;  静力;  低周疲劳;  数值模拟
Keywords:
modeled recycled aggregate concrete(MRAC);  uniaxial compression;  static force;  low-cycle fatigue;  numerical simulation
分类号:
TU528.79;TU502
DOI:
10.3969/j.issn.1001-0505.2016.03.016
摘要:
为了探讨再生混凝土中各相力学性能对其宏观力学性能的影响、寻找改善再生混凝土静力与疲劳性能的有效途径,基于ABAQUS软件建立了九骨料模型再生混凝土的有限元模型,并对各相材料赋予不同的损伤本构.分别采用显式准静态分析步和直接循环分析步对九骨料模型再生混凝土的单轴受压静力和低周疲劳加载进行数值模拟,并将静力性能仿真结果与试验结果进行对比.变参数分析结果表明:静力性能仿真结果与试验结果吻合较好;模型再生混凝土在界面过渡区会产生明显的应力集中现象,导致界面区砂浆塑性变形加剧,促使裂纹产生和扩展;随着再生粗骨料取代率的降低,模型再生混凝土的单轴受压强度和峰值应变逐渐增大;随着新砂浆强度的提高,模型再生混凝土的单轴受压强度逐渐增大;模型再生混凝土的疲劳性能较再生混凝土低,且应力-疲劳寿命曲线的趋势与普通混凝土相近.
Abstract:
To investigate the effect of the mechanical properties of each phase in recycled concrete on its macroscopic mechanical behaviors, and to find an effective way to improve the static behavior and the fatigue strength of recycled concrete, the finite element model for modeled recycled aggregate concrete(MRAC)with 9 coarse aggregates was established by ABAQUS software, and different damage constitutive relationships were selected for different phases. The dynamic explicit step and the direct cyclic step were used to simulate the static behavior and low-cycle fatigue procedure under uniaxial compression, respectively, and the simulation results of the static behaviors were compared with the experimental results. The variable parameter analysis results show that the simulation results of the static behaviors are well consistent with the experimental results. Stress concentration occurs in the interface zone, resulting in a plastic strain increment of the mortar in the interface region followed by the formation and propagation of cracks. With the decrease of the replacement of recycled coarse aggregate, the uniaxial compressive strength and the peak strain of MRAC increase. With the increase of the strength of the new hardened cement paste, the uniaxial compressive strength of MRAC increases. The fatigue strength of MRAC is lower than that of the recycled aggregate concrete prism, and the tendency of the stress-life curve of MRAC is close to that of natural aggregate concrete.

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备注/Memo

备注/Memo:
收稿日期: 2015-09-02.
作者简介: 肖建庄(1968—),男,博士,教授,博士生导师,jzx@tongji.edu.cn.
基金项目: 国家自然科学基金杰出青年科学基金资助项目(51325802).
引用本文: 肖建庄,黄凯文,李龙.模型再生混凝土单轴受压静力与疲劳性能数值仿真[J].东南大学学报(自然科学版),2016,46(3):552-558. DOI:10.3969/j.issn.1001-0505.2016.03.016.
更新日期/Last Update: 2016-05-20