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

卷:

40卷

期数:

2023年06期

页码:

1-9

栏目:

建筑材料

出版日期:

2023-11-30

文章信息/Info

Title:

Cyclic loading deformation and fatigue life prediction of basalt fiber recycled aggregate concrete

文章编号:

1673-2049(2023)06-0001-09

作者:

周金枝^1,2,吴 学^1,3,钟楚珩¹,田 鹏¹,余智玲¹

(1. 湖北工业大学 土木建筑与环境学院,湖北 武汉 430068; 2. 桥梁结构健康与安全国家重点实验室,湖北 武汉 430034; 3. 中建三局集团(深圳)有限公司,广东 深圳 518000)

Author(s):

ZHOU Jinzhi^1,2, WU Xue^1,3, ZHONG Chuheng¹, TIAN Peng¹, YU Zhiling¹

(1. College of Civil Architecture and Environment, Hubei University of Technology, Wuhan 430068, Hubei, China; 2. State Key Laboratory of Bridge Structure Health and Safety, Wuhan 430034, Hubei, China; 3. China Construction Third Engineering Bureau Group(Shenzhen)Co., Ltd, Shenzhen 518000, Guangdong, China)

关键词:

玄武岩纤维再生混凝土;  疲劳损伤;  刚度退化;  响应面法;  疲劳寿命预测

Keywords:

basalt fiber recycled aggregate concrete;  fatigue damage;  rigidity degeneration;  response surface methodology;  fatigue life prediction

分类号:

TU528

DOI:

10.19815/j.jace.2022.05088

文献标志码:

A

摘要:

为改善再生混凝土(RAC)的疲劳性能,掺入玄武岩纤维制成玄武岩纤维增强再生混凝土(BFRAC),对不同纤维体积率的BFRAC弯曲疲劳性能进行研究,分析了BFRAC的疲劳变形规律,并采用响应面法(RSM)研究了纤维体积率和应力水平对其疲劳寿命的影响。结果表明:BFRAC的疲劳应变和疲劳模量都呈三阶段发展; 随着应力水平和循环比的增大,疲劳应变逐渐增大,疲劳模量逐渐减小; 随着纤维体积率的增大,疲劳应变和疲劳模量发展减缓,其中纤维体积率为0.3%时效果最佳; 在相同应力水平下RAC疲劳寿命低于天然混凝土(NAC),玄武岩纤维的掺入可显著提高RAC疲劳寿命,随着纤维体积率的增大,BFRAC疲劳寿命呈现先增大后减小的趋势; 通过RSM建立的BFRAC疲劳寿命预测模型经检验证明具有良好精度; 纤维体积率和应力水平的交互作用对BFRAC疲劳寿命有一定影响,但应力水平的大小对BFRAC疲劳寿命的影响更为显著; 采用渴求函数对BFRAC进行多目标优化得出在0.6、0.7、0.8应力水平下的最优纤维掺量分别为0.321%、0.317%、0.313%。

Abstract:

In order to improve the fatigue performance of recycled aggregate concrete(RAC), basalt fiber was incorporated to make basalt fiber reinforced recycled aggregate concrete(BFRAC). The bending fatigue performance of BFRAC with different fiber volume fractions was investigated, then the fatigue deformation law of BFRAC was analyzed, and the effect of fiber volume fraction and stress level on its fatigue life was studied by response surface methodology(RSM). The results show that the fatigue strain and fatigue modulus of BFRAC develop in three stages. With the increase of stress level and cycle ratio, the fatigue strain gradually increases and the fatigue modulus gradually decreases. With the increase of fiber volume fraction, the development of fatigue strain and fatigue modulus slows down, and the effect is the best when the fiber volume fraction is 0.3%. The fatigue life of RAC is lower than that of normal aggregate concrete(NAC)at the same stress level, and the incorporation of basalt fibers can significantly improve the fatigue life of RAC, with the increase of fiber volume fraction, BFRAC fatigue life shows a trend of increasing first and then decreasing. The fatigue life prediction model of BFRAC established by RSM is tested and proved to have good accuracy. The interaction of fiber volume fraction and stress level has some effect on BFRAC fatigue life, but the magnitude of stress level has more significant effect on BFRAC fatigue life. The multi-objective optimization of BFRAC using the desirability function shows that optimal fiber volume fraction is 0.321%, 0.317%, and 0.313% at 0.6, 0.7, and 0.8 stress levels, respectively.

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备注/Memo

备注/Memo:

收稿日期:2022-11-29
基金项目:桥梁结构健康与安全国家重点实验室开放课题(BHSKL19-04-KF); 湖北省教研项目(2017314)
作者简介:周金枝(1965-),女,工学博士,教授,博士生导师,E-mail:hgzhougzhou@126.com。
通信作者:钟楚珩(1989-),男,工学博士,讲师,E-mail:chuheng.zhong@hbut.edu.cn。

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更新日期/Last Update: 2023-12-01