Effect of polypropylene fibers on the bond-slip performance of HSS bars in HPC and UHPC

IF 2.1 4区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Advances in Structural Engineering Pub Date : 2024-07-22 DOI:10.1177/13694332241266544

Arash K. Pour, Ehsan Noroozinejad Farsangi

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引用次数: 0

Abstract

To control the structural performance of reinforced concrete (RC) members, enough bonding between rebars and concrete should be provided. Different parameters affect the bond interaction between rebars and concrete. This investigation tends to assess the bonding resistance behaviour of high-strength steel (HSS) bars in concrete considering the effect of two types of concrete: high-performance concrete (HPC) and ultra-high-performance concrete (UHPC). In addition to the type of concrete, the effect of fibers incorporation is measured. For this aim, a total of thirty-six specimens were cast and evaluated. Two diameters (12 mm and 16 mm) and three embedded lengths (1, 2, and 3 times the diameter of rebars) were also used, and the impact of the rebar’s diameter and embedded length on the load-bearing capacity, stress and slip of rebars were examined. To boost the bonding characteristics of reinforcements, three various polypropylene fibres (PF) contents were added: 0%, 0.5% and 1%. A pull-out test was carried out on samples. In addition, the obtained results and previous models proposed by literature have been employed to generate new models to predict the bond-slip characteristics of HSS bars in HPC and UHPC when different PF contents are incorporated. The results showed that the maximum peak of slip between the HSS bars and concrete deteriorated with the utilisation of PF, and this peak declined more for UHPC. Additionally, the load capability of specimens was significantly enhanced when PF were added. Finally, the model suggested in this paper may be used to forecast the ultimate stress and bond-slip characteristics of HSS bars in conventional and PF-reinforced HPC and UHPC, with a good level of correctness with the experimental results.

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聚丙烯纤维对高速钢棒材在高强混凝土和超高强混凝土中的粘结-滑动性能的影响

要控制钢筋混凝土（RC）构件的结构性能，钢筋和混凝土之间必须有足够的粘结力。不同的参数会影响钢筋和混凝土之间的粘结相互作用。考虑到高性能混凝土（HPC）和超高性能混凝土（UHPC）这两种混凝土的影响，本研究倾向于评估混凝土中高强度钢筋（HSS）的抗粘结性能。除混凝土类型外，还测量了掺入纤维的影响。为此，共浇注和评估了三十六个试样。同时还使用了两种直径（12 毫米和 16 毫米）和三种嵌入长度（钢筋直径的 1 倍、2 倍和 3 倍），研究了钢筋直径和嵌入长度对钢筋承载能力、应力和滑移的影响。为了提高钢筋的粘结特性，添加了三种不同含量的聚丙烯纤维（PF）：0%、0.5% 和 1%。对样品进行了拉拔试验。此外，还利用所获得的结果和以往文献中提出的模型生成了新的模型，用于预测加入不同 PF 含量的 HSS 钢筋在 HPC 和 UHPC 中的粘结-滑移特性。结果表明，随着 PF 含量的增加，高速钢钢筋与混凝土之间的最大滑移峰值降低，而 UHPC 的滑移峰值降低幅度更大。此外，添加 PF 后，试样的承载能力明显增强。最后，本文提出的模型可用于预测高速钢条在传统和 PF 增强 HPC 和 UHPC 中的极限应力和粘结滑移特性，与实验结果具有很好的正确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Structural Engineering 工程技术-工程：土木

CiteScore

5.00

自引率

11.50%

发文量

230

审稿时长

2.3 months

期刊介绍： Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.