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Experimental Studies on Bond Performance of BFRP Bars Reinforced Coral Aggregate Concrete
International Journal of Concrete Structures and Materials ( IF 3.4 ) Pub Date : 2019-11-04 , DOI: 10.1186/s40069-019-0367-7
Lei Wang , Zhaoping Song , Jin Yi , Jiayi Li , Feng Fu , Kai Qian

Basalt fiber reinforced polymer (BFRP) rebars reinforced coral aggregate concrete is a new type of concrete used in ocean engineering. In order to investigate the bond performance between BFRP rebars and coral concrete, 30 pull-out tests were carried out in 10 groups with different diameters of BFRP rebars, bonding lengths and strength of the coral concrete. The results show that good bonding between BFRP rebars and coral concrete were achieved. The main failure modes can be categorized as BFRP rebars pull out destruction, splitting failure of coral concrete and BFRP rebars fracture. The bond slip ( $$\tau{\text{-}}s$$ ) curves of the BFRP rebars and coral concrete were obtained during the tests. It was found to be similar to the common concrete using fiber reinforced polymer (FRP) bars. The bond-slip relation can be roughly divided into micro-slip phase, slip phase, decline phase, and the residual stress stage. The bond between BFRP rebars and coral concrete increases with the increase of the bond length and diameter of BFRP rebars, but the average bond stress will decrease. Moreover, increasing the strength of coral concrete is effective to improve the bond performance of BFRP rebars. In this paper, the continuous bond slip model (Gao et al. in J Zhengzhou Univ 23:1–5, 2002) was used to represent the $$\tau{\text{-}}s$$ constitutive relationship of BFRP rebars and coral concrete. The analysis show that the proposed model has a high degree of accuracy in representing $$\tau{\text{-}}s$$ curve of BFRP rebars and coral concrete.

中文翻译:

BFRP筋增强珊瑚骨料混凝土粘结性能试验研究

玄武岩纤维增强聚合物(BFRP)钢筋增强珊瑚骨料混凝土是一种用于海洋工程的新型混凝土。为了研究BFRP钢筋与珊瑚混凝土的粘结性能,对不同直径的BFRP钢筋、粘结长度和珊瑚混凝土强度进行了10组30次拉拔试验。结果表明,BFRP 钢筋和珊瑚混凝土之间实现了良好的粘结。主要破坏模式可分为BFRP钢筋拉出破坏、珊瑚混凝土劈裂破坏和BFRP钢筋断裂。在测试过程中获得了 BFRP 钢筋和珊瑚混凝土的粘结滑移 ( $$\tau{\text{-}}s$$ ) 曲线。发现它类似于使用纤维增强聚合物 (FRP) 钢筋的普通混凝土。键滑关系大致可分为微滑移阶段、滑移阶段、下降阶段和残余应力阶段。BFRP钢筋与珊瑚混凝土之间的结合力随着BFRP钢筋结合长度和直径的增加而增加,但平均结合应力会降低。此外,增加珊瑚混凝土的强度可有效提高 BFRP 钢筋的粘结性能。本文采用连续滑移模型(Gao et al. in J Zhengzhou Univ 23:1–5, 2002)来表示BFRP钢筋的$$\tau{\text{-}}s$$本构关系和珊瑚混凝土。分析表明,所提出的模型在表示BFRP钢筋和珊瑚混凝土的$$\tau{\text{-}}s$$曲线方面具有很高的准确性。BFRP钢筋与珊瑚混凝土之间的结合力随着BFRP钢筋结合长度和直径的增加而增加,但平均结合应力会降低。此外,增加珊瑚混凝土的强度可有效提高 BFRP 钢筋的粘结性能。本文采用连续滑移模型(Gao et al. in J Zhengzhou Univ 23:1–5, 2002)来表示BFRP钢筋的$$\tau{\text{-}}s$$本构关系和珊瑚混凝土。分析表明,所提出的模型在表示BFRP钢筋和珊瑚混凝土的$$\tau{\text{-}}s$$曲线方面具有很高的准确性。BFRP钢筋与珊瑚混凝土之间的结合力随着BFRP钢筋结合长度和直径的增加而增加,但平均结合应力会降低。此外,增加珊瑚混凝土的强度可有效提高 BFRP 钢筋的粘结性能。本文采用连续滑移模型(Gao et al. in J Zhengzhou Univ 23:1–5, 2002)来表示BFRP钢筋的$$\tau{\text{-}}s$$本构关系和珊瑚混凝土。分析表明,所提出的模型在表示BFRP钢筋和珊瑚混凝土的$$\tau{\text{-}}s$$曲线方面具有很高的准确性。增加珊瑚混凝土的强度可有效提高BFRP钢筋的粘结性能。本文采用连续滑移模型(Gao et al. in J Zhengzhou Univ 23:1–5, 2002)来表示BFRP钢筋的$$\tau{\text{-}}s$$本构关系和珊瑚混凝土。分析表明,所提出的模型在表示BFRP钢筋和珊瑚混凝土的$$\tau{\text{-}}s$$曲线方面具有很高的准确性。增加珊瑚混凝土的强度可有效提高 BFRP 钢筋的粘结性能。本文采用连续滑移模型(Gao et al. in J Zhengzhou Univ 23:1–5, 2002)来表示BFRP钢筋的$$\tau{\text{-}}s$$本构关系和珊瑚混凝土。分析表明,所提出的模型在表示BFRP钢筋和珊瑚混凝土的$$\tau{\text{-}}s$$曲线方面具有很高的准确性。
更新日期:2019-11-04
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