Bonding behavior of lap-spliced reinforcing bars embedded in ultra-high-performance concrete with steel fibers

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-12-01 DOI:10.1016/j.dibe.2024.100585

Krairerk Aiamsri , Teerasak Yaowarat , Suksun Horpibulsuk , Apichat Suddeepong , Apinun Buritatum , Kanchana Hiranwatthana , Kirati Nitichote

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Abstract

This study explores the bond strength of steel reinforcing bars in normal concrete (NC) and ultra-high-performance concrete (UHPC) with steel fibers, focusing on the behavior of lap-spliced rebars. Key variables such as rebar diameter (D), spacing (s), lap-splice length (L₁), and hook length (L₂) were evaluated to understand their impact on bond performance. Both NC and UHPC increase in bond strength with greater spacing and lap-splice length, with UHPC demonstrating significantly stronger bond characteristics due to its higher compressive strength. A novel predictive method for calculating bond strength is proposed, offering practical guidance for designing lap-spliced rebars in construction, and includes reduction factors tailored for realistic construction settings. This method achieves an error margin below ±16.5%, providing an accurate approach for practitioners. This rational method incorporates both engineering and economic considerations, particularly valuable for applications in precast concrete structures where enhanced bond performance and durability are essential.

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钢纤维超高性能混凝土中搭接钢筋的粘结性能

本研究探讨了普通混凝土（NC）和超高性能混凝土（UHPC）中钢筋与钢纤维的粘结强度，重点研究了搭接钢筋的性能。评估了钢筋直径(D)、间距(s)、搭接长度（L1）和钩长（L2）等关键变量，以了解它们对粘结性能的影响。NC和UHPC的结合强度随着间距和搭接长度的增大而增加，其中UHPC的抗压强度更高，表现出更强的结合特性。提出了一种新的粘结强度预测计算方法，为施工中搭接钢筋的设计提供了实用指导，并包含了适合实际施工环境的折减系数。该方法的误差范围小于±16.5%，为从业者提供了准确的方法。这种合理的方法结合了工程和经济方面的考虑，对于预制混凝土结构的应用尤其有价值，因为增强的粘结性能和耐久性是必不可少的。

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

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.