Study on Shear Performance of Corroded Steel Fiber Reinforced Concrete Beams under Impact Load

Author:

Gu Jianxiao1ORCID,Li Liancheng2,Huang Xin3,Chen Hui1

Affiliation:

1. Wenzhou Key Laboratory of Intelligent Lifeline Protection and Emergency Technology for Resilient City, College of Architecture and Energy Engineering, Wenzhou University of Technology, Wenzhou 325035, China

2. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, China

3. Wenzhou Traffic Engineering Testing and Testing Co., Ltd., Wenzhou 325035, China

Abstract

With the growing use of steel-fiber-reinforced-concrete (SFRC) beams in environmentally friendly and rapid construction, it is essential to assess their impact performance. These beams may encounter unexpected impact loadings from accidents or terrorist attacks during service life. This study explored the impact of steel fiber content and drop hammer height on the impact load testing of corrosion-treated SFRC beams. Experiments were conducted with varying steel fiber contents (0%, 0.25%, 0.5%, 0.75%, and 1.0%), and drop hammer height (1 m, 2 m, and 3 m). The corrosion test demonstrates that SFRC beams supplemented with steel fibers showcase a diminished surface rust spot area in comparison to those lacking fibers. This improvement is ascribed to the bonding between fibers and the concrete matrix, along with their current-sharing properties. SFRC beams, subjected to impact testing, exhibit concrete crushing at the top without spalling, showcasing improved impact resistance due to increased fiber content, which reduces crack formation. Additionally, different fiber contents yield varied responses to impact loads, with higher fiber content notably enhancing overall beam performance and energy dissipation capacity. Energy dissipation analysis shows a moderate increase with higher fiber contents, and impulse impact force generally rises with fiber content, indicating improved impact resistance.

Funder

Natural Science Foundation of Zhejiang Province

Natural Science Foundation of Wenzhou Zhejiang Province

Science Foundation of the Wenzhou University of Technology

National Natural Science Foundation of China

Publisher

MDPI AG

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