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Open Access

REVIEW

Kinked Rebar and Engineering Structures Applying Kinked Materials: State-of-the-Art Review

Chengquan Wang1,2, Lei Xu3, Xinquan Wang1, Yun Zou3,*, Kangyu Wang4, Boyan Ping5, Xiao Li1
1 Department of Civil Engineering, Hangzhou City University, Hangzhou, 310015, China
2 Zhejiang Engineering Research Center of Intelligent Urban Infrastructure, Hangzhou, 310015, China
3 Department of Civil Engineering, Jiangnan University, Wuxi, 214122, China
4 School of Civil Engineering, Zhejiang University of Technology, Hangzhou, 310014, China
5 Department of Civil Engineering, Tongji University, Shanghai, 200092, China
* Corresponding Author: Yun Zou. Email: email
(This article belongs to the Special Issue: Advancements in Smart Materials Dynamic Analysis for Novel Approaches of Structural Control and Healthy Monitoring)

Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2024.055096

Received 17 June 2024; Accepted 27 September 2024; Published online 06 November 2024

Abstract

Kinked rebar is a special type of steel material, which is installed in beam column nodes and frame beams. It effectively enhances the blast resilience, seismic collapse resistance, and progressive collapse resistance of reinforced concrete (RC) structures without imposing substantial cost burdens, thereby emerging as a focal point of recent research endeavors. On the basis of explaining the working principle of kinked rebars, this paper reviews the research status of kinked rebars at home and abroad from three core domains: the tensile mechanical properties of kinked rebars, beam column nodes with kinked rebars, and concrete frame structures with kinked rebars. The analysis underscores that the straightening process of kinked rebars does not compromise their ultimate strength but significantly bolsters structural ductility and enhances energy dissipation capabilities. In beam-column joints, the incorporation of kinked rebars facilitates the seamless transfer of plastic hinges, adhering to the design principle of “strong columns and weak beams.” In addition, kinked rebars can greatly improve the resistance of the beam; The seismic resistance, internal explosion resistance, and progressive collapse resistance of reinforced concrete frame structures with kinked rebar have significantly improved. Beyond its primary application, the principle of kinked rebar was extended to other applications of kinked materials such as corrugated steel plates and origami structures, and the stress characteristics of related components and structures were studied. Intriguingly, this paper also proposes the application of kinked rebars in bridge engineering, aiming to address the challenges of localized damage concentration and excessive residual displacement in RC bridge piers. The introduction of kinked rebars in piers is envisioned to mitigate these issues, with the paper outlining its advantages and feasibility, thereby offering valuable insights for future research on kinked reinforcement and seismic design strategies for bridges.

Keywords

Structural engineering; kinked rebar; seismic performance; explosion-resistant performance; progressive collapse

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