BFRP筋碱激发混凝土粘结性能试验研究与数值模拟

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (6): 1896-1911.

所属专题：水泥混凝土

BFRP筋碱激发混凝土粘结性能试验研究与数值模拟

范小春¹, 徐伟¹, 陈远程¹, 梁天福², 尹耀霄³

1.武汉理工大学土木工程与建筑学院,武汉 430070;
2.武汉地铁集团,武汉 430000;
3.湖北交投智能检测股份有限公司,武汉 430000

收稿日期:2022-01-28 修订日期:2022-03-23 出版日期:2022-06-15 发布日期:2022-07-01
作者简介:范小春(1975—),男,教授。主要从事新型混凝土材料与结构的研究。E-mail:fxcfree@126.com
基金资助:
国家自然科学基金面上项目(41972271)

Experimental Study and Numericals Simulation on Bond Performance of Basalt Fiber Reinforced Polymer Bars and Alkali Activated Concrete

FAN Xiaochun¹, XU Wei¹, CHEN Yuancheng¹, LIANG Tianfu², YIN Yaoxiao³

1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;
2. Wuhan Metro Group Co., Ltd., Wuhan 430000, China;
3. Hubei Jiaotou Intelligent Testing Co., Ltd., Wuhan 430000, China

Received:2022-01-28 Revised:2022-03-23 Online:2022-06-15 Published:2022-07-01

摘要/Abstract

摘要： 玄武岩纤维增强复合筋(BFRP筋)碱激发混凝土为海洋环境下混凝土的耐久性提供安全保障。在其中心拉拔试验的基础上,采用分离式模型,运用ABAQUS有限元软件进行粘结滑移性能数值模拟与分析。通过试验数据,得出适用于BFRP筋碱激发混凝土的粘结滑移本构模型以及碱激发混凝土的塑性损伤模型,构建了基于非线性弹簧单元的数值模型,试验结果与计算结果吻合程度较好,验证了模型的准确性。试验与模拟结果表明:粘结长度为2.5d、5d(d为BFRP筋直径)的试件均发生筋材拔出破坏,粘结长度为10d的试件均发生劈裂破坏;BFRP筋与碱激发混凝土之间的粘结应力分布并不均匀,随着粘结长度和筋材直径的增大,极限粘结强度逐渐减小;当BFRP筋直径d=12 mm,粘结长度为2.5d、5d和10d的碱激发混凝土试块极限粘结强度分别为13.92 MPa、13.56 MPa和12.60 MPa,较相同粘结长度的普通混凝土试件,其极限粘结强度分别提高6.58%、10.97%和9.76%。

关键词: 玄武岩纤维增强复合筋, 碱激发混凝土, 粘结性能, 粘结滑移本构模型, 塑性损伤模型, 非线性弹簧单元

Abstract: Basalt fiber reinforced polymer bars (BFRP bars) and alkali activated concrete provides a safety guarantee for the durability of concrete in the marine environment. A separate analytical model was proposed to examine the bond slip performance based on a series of pullout experimental tests. Based on the experimental data, the bond slip constitutive model and the plastic damage model of BFRP bars and alkali activated concrete were obtained, and the numerical model based on the nonlinear spring element was constructed. Through the numerical analysis and experimental results, it is concluded that the calculated results of the proposed model matches well with the test results. The test and simulation results show that the specimens with the bond length of 2.5d and 5d (d is the diameter of BFRP bars) all have pull-out failure, while the specimens with the bond length of 10d have splitting failure. The distribution of bond stress between BFRP bars and alkali activated concrete is not uniform. With the increase of bond length and BFRP bars diameter, the ultimate bond strength decreases gradually.When the diameter of BFRP bars is 12 mm and the bond length is 2.5d, 5d and 10d, the ultimate bond strength of alkali activated concrete test block is 13.92 MPa, 13.56 MPa and 12.60 MPa, respectively. Compared with ordinary concrete specimens with the same bond length, the ultimate bond strength increases by 6.58%, 10.97% and 9.76%, respectively.

Key words: basalt fiber reinforced polymer bar, alkali activated concrete, bond performance, bond slip constitutive model, plastic damage model, nonlinear spring element

中图分类号:

TU528

范小春, 徐伟, 陈远程, 梁天福, 尹耀霄. BFRP筋碱激发混凝土粘结性能试验研究与数值模拟[J]. 硅酸盐通报, 2022, 41(6): 1896-1911.

FAN Xiaochun, XU Wei, CHEN Yuancheng, LIANG Tianfu, YIN Yaoxiao. Experimental Study and Numericals Simulation on Bond Performance of Basalt Fiber Reinforced Polymer Bars and Alkali Activated Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(6): 1896-1911.

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BFRP筋碱激发混凝土粘结性能试验研究与数值模拟

Experimental Study and Numericals Simulation on Bond Performance of Basalt Fiber Reinforced Polymer Bars and Alkali Activated Concrete

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