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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

41卷

期数:

2024年01期

页码:

181-190

栏目:

建筑结构

出版日期:

2024-01-20

文章信息/Info

Title:

Numerical simulation of basalt fiber concrete based on 3D mesoscale model

文章编号:

1673-2049(2024)01-0181-10

作者:

熊 汪,覃书豪,彭定东,周 超,吴 辽,王玲玲

(贵州大学 土木工程学院,贵州 贵阳 550025)

Author(s):

XIONG Wang, QIN Shuhao, PENG Dingdong, ZHOU Chao, WU Liao, WANG Lingling

(College of Civil Engineering, Guizhou University, Guiyang 550025, Guizhou, China)

关键词:

玄武岩纤维混凝土;  三维细观模型;  力学性能;  纤维掺量;  数值模拟

Keywords:

basalt fiber concrete;  3D mesoscale model;  mechanical property;  fiber content;  numerical simulation

分类号:

TU528

DOI:

10.19815/j.jace.2022.04091

文献标志码:

A

摘要:

基于玄武岩纤维-砂浆界面的相关理论和试验数据,提出一种建立小直径纤维-骨料混凝土细观模型的方法,研究玄武岩纤维混凝土的损伤演化和纤维对混凝土的增强机理。通过建立的随机纤维-骨料混凝土三维细观模型预测和验证了玄武岩纤维混凝土的立方体抗压强度、劈裂抗拉强度、轴心抗压强度和抗折强度等力学性能,并从细观角度分析了混凝土的损伤演化和纤维的作用机理; 建立不同分布形式、不同纤维掺量的随机纤维-骨料混凝土模型,研究了细观模型的力学稳定性及纤维掺量对混凝土的影响规律。结果表明:基于该方法建立的细观模型在预测玄武岩纤维混凝土静态力学性能方面具有较高的可靠性; 混凝土损伤首先发生在较大基体变形的薄弱界面过渡区,并随着荷载的增加延展、联接,最终导致试件的整体破坏; 玄武岩纤维具有抵抗基体变形的约束作用,对混凝土力学性能影响明显; 纤维掺量小于1.5%时,掺量越大,增强效果越明显。

Abstract:

Based on the theory and experimental data of basalt fiber-mortar interface, a small diameter fiber-aggregate concrete model was proposed, the damage evolution of basalt fiber reinforced concrete(BFRC)and the mechanism of fiber reinforced concrete were studied. The mechanical property of BFRC, such as cubic compressive strength, splitting tensile strength, axial compressive strength and flexural strength, were predicted and verified by establishing a three-dimensional mesoscale random fiber-aggregate concrete model, then the damage evolution of concrete and the action mechanism of fiber were analyzed from the mesoscale view. The random fiber-aggregate concrete model with different distributions and different fiber contents was established, then the stability of mesoscale model and the effect of fiber contents on concrete were studied. The results show that the mesoscale model based on the method has high reliability in predicting the static mechanical property of BFRC. The damage of concrete occurs in the weak interfacial transition zone of the larger matrix deformation initially, then extends and connects with the increase of loading, and finally leads the overall failure of specimen. Basalt fiber has the restraint function of resisting matrix deformation, and obviously affects the mechanical property of concrete. When the fiber content is less than 1.5%, the mechanical property increases with the increase of fiber content.

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相似文献/References:

[1]王 钧,郭大鹏,马 跃.玄武岩纤维混凝土与钢筋粘结锚固性能试验与分析[J].建筑科学与工程学报,2015,32(01):81.
　WANG Jun,GUO Da-peng,MA Yue.Experiment and Analysis of Bond-anchorage Properties Between BFRC and Steel Bars[J].Journal of Architecture and Civil Engineering,2015,32(01):81.
[2]邓宗才,薛会青.玄武岩纤维混凝土的抗弯冲击性能[J].建筑科学与工程学报,2009,26(01):80.
　DENG Zong-cai,XUE Hui-qing.Flexural Impact Behavior of Basalt Fiber Concrete[J].Journal of Architecture and Civil Engineering,2009,26(01):80.

备注/Memo

备注/Memo:

收稿日期:2023-04-21
基金项目:国家自然科学基金项目(12162009); 贵州省科技计划项目(黔科合基础[2020]1Y244); 贵州大学培育计划项目(2019[28])
通信作者:吴 辽(1985-),男,工学博士,副教授,E-mail:lwu7@gzu.edu.cn。

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更新日期/Last Update: 2024-01-25