超高性能混凝土中钢纤维锈蚀的细观力学分析

舒刚; 张清华; 黄云; 卜一之

doi:10.3969/j.issn.0258-2724.20170453

超高性能混凝土中钢纤维锈蚀的细观力学分析

doi: 10.3969/j.issn.0258-2724.20170453

舒刚^1,,
张清华^2, ,,
黄云²,
卜一之²

基金项目: 国家自然科学基金资助项目（51578455，51378431，51178394）；国家科技支撑计划（2011BAG07B03）；中央高校基本科研业务费专项资金资助项目（2682014CX078）；湖北省交通运输厅科技项目（2017-538-2-4）

详细信息

作者简介:
舒刚（1991—），男，工程师，研究方向为钢结构和混凝土结构桥梁，E-mail：shu_gang@foxmail.com

通讯作者:
张清华（1975—），男，教授，博士，博士生导师，研究方向为高疲劳抗力钢与混凝土组合结构桥梁，E-mail：swjtuzqh@126.com

中图分类号: U448.38
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出版历程
- 收稿日期: 2017-06-14
- 修回日期: 2018-06-20
- 网络出版日期: 2018-06-22
- 刊出日期: 2019-12-01

Micromechanical Analysis of Steel Fiber Corrosion in Ultra-high Performance Concrete

摘要

摘要: 为了研究钢纤维体积含量和锈蚀程度对结构强度和变形的影响，通过自行编写Python脚本文件，对ABAQUS软件进行二次开发，实现了钢纤维在超高性能混凝土（UHPC）基体中的大批量随机乱向均匀分布；在此基础上研究了UHPC带缺陷锈蚀模拟方法，进而探索了钢纤维锈蚀的等效方法；最后以UHPC梁四点抗弯试验为例，对UHPC细观力学分析方法、锈蚀的模拟方法和等效手段进行了验证. 研究结果表明：当纤维体积含量为2% 时，UHPC梁的抗弯曲性能最佳；影响锈蚀效应的关键因素为锈蚀造成纤维截面削弱、锈坑附近产生应力集中、界面粘结遭到破坏；采用随机材料属性分配的方式，仅局限于模拟UHPC梁的宏观变形，无法准确模拟应力场分布情况.
- 超高性能混凝土（UHPC） /
- 细观力学分析 /
- 钢纤维锈蚀模拟 /
- ABAQUS二次开发 /
- PYTHON算法 /
- 模型试验
Abstract: In order to study the influence of the volume content and corrosion degree of the steel fiber on the strength and deformation of the structure, the large-volume randomization of the steel fiber in ultra-high performance concrete (UHPC) matrix was realized by the ABAQUS software redeveloped by self-compiling Python script file. Based on this, the UHPC defect corrosion simulation method was developed and the equivalent method of the steel fiber corrosion was explored. Finally, the UHPC beam four-point bending test was taked as an example to verify the UHPC micromechanics analysis method, corrosion simulation method, and equivalent means. The results show that when the fiber volume content is 2%, the UHPC beam has the best bending resistance; corrosion weakens the cross-section of fibers, stress concentration near the corrosion pits and the destroyed interfacial bonding are the key factors affecting the corrosion effect. The random material property distribution method is limited to simulate the macroscopic deformation of UHPC beams, and can’t accurately simulate the distribution of stress field.
- ultra-high performance concrete (UHPC) /
- micromechanical analysis /
- steel fiber corrosion simulation /
- ABAQUS secondary development /
- PYTHON algorithm /
- model test

HTML全文

图 1 RVE中的第i根纤维(Fibre-i)

Figure 1. i-th fiber in the RVE

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图 2 随机纤维生成流程

Figure 2. Flow chart of random fiber

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图 3 坑蚀特征

Figure 3. Pit erosion characteristics

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图 4 椭球形锈坑

Figure 4. Ellipsoidal rust pit

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图 5 四点抗弯模型

Figure 5. Model of the four-point bending

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图 6 钢纤维三维模型

Figure 6. 3D model of steel fiber

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图 7 UHPC梁有限元模型

Figure 7. Finite element model of UHPC beam

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图 8 纤维分布模型

Figure 8. Model of fiber distribution

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图 9 锈蚀钢纤维有限元模型

Figure 9. Finite element model of corroded steel fiber

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图 10 随机材料属性有限元模型

Figure 10. Finite element model of random material properties

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图 11 荷载-挠度曲线

Figure 11. Load-deflection curve

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图 12 抗弯强度

Figure 12. bending strength

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图 13 随机材料属性下的Mises应力

Figure 13. Mises stress diagram of random material properties

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表 1 锈坑参数

Table 1. Pit parameters

锈蚀程度锈坑深度/mm 锈坑宽度/mm

$1$ 0.08 0.30
$2$ 0.08 1.10
$3$ 0.18 0.30
$4$ 0.18 1.10

下载: 导出CSV

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