Researchers at Shenzhen University have developed a new, self-sensitive steel fiber reinforced polymer composite rod (SFCB), which integrates distributed fiber optic sensors (DFOs) for real-time monitoring of cracks and mechanical behaviors in increased concrete members. This innovative approach, which is listed in a recently published study Mechanical engineeringThe aim is to improve the durability and security of the civil infrastructure by providing a more precise and reliable method for structural health monitoring.
The study under the direction of Feng Xing and Zhongfeng ZHU examines the potential of SFCBS, which are embedded with DFOS technology in order to monitor the trunk and recognize cracks in concrete structures. Traditional methods for evaluating concrete cracks are often based on point sensors that have restrictions on the recording of the complex and variable nature of crack development. In contrast, DFOS technology, based on the optical frequency domaina reflectometry (OFDR), offers high-resolution stretch measurements over a spacious area, which makes it a promising tool for structural health monitoring.
The research team designed a number of tension tests to SFCB reinforced concrete members in order to examine the effects of ceiling depth, binding mechanisms and concrete type on the end effects observed during stretch measurements. The tests showed that the use of members with small cover depths, surface -treated SFCBS and geopolymer concrete (GPC) can significantly reduce the influence of end effects, which leads to more precise stretch measurements.
An important innovation in this study is the development of a theoretical model to predict the load reaction of SFCB reinforced concrete voltage members. The model, validated by experimental data, takes into account the train behavior of the concrete and the interaction between SFCB and the surrounding concrete. This model offers a reliable basis for assessing the structural integrity of tension members reinforced concrete.
The study also suggests a method for calculating crack widths based on DFOS line measurements. By analyzing the expansion distribution along the SFCB, researchers can identify cracks and have to appreciate crack widths, which gives valuable insights into the concrete's damage status. This method, which takes into account both visible and internal cracks, offers a more comprehensive assessment of structural health compared to conventional surface monitoring techniques.
The results of this research have a significant impact on the maintenance and repair of the civilian infrastructure. By enabling the real -time monitoring of cracks and mechanical behaviors, self -sensitive SFCBs can help the engineers to recognize early signs of damage and to take timely measures to prevent catastrophic mistakes. The study shows the potential of DFOS technology for transformation of structural health surveillance and offers a more efficient and reliable alternative to conventional methods.
Future research will concentrate on the expansion of the sample size and the research of a wider spectrum of crack patterns with the help of extended monitoring techniques. The team also plans to examine the long -term performance of SFCBs under various environmental conditions and to further validate the robustness and applicability of their approach.
The paper “Self-sustainable Stahl-ERP composite rods for crack monitoring and mechanical behavioral assessment in reinforced concrete members” is written by Yingwu Zhou, Zenghui Ye, Feng Xing, Zhongfeng ZHU, Xiaoxu Huang. Full text of the Open Access paper: https://doi.org/10.1016/j.eng.2025.03.001. More information about Mechanical engineeringVisit the website at https://www.sciencedirect.com/journal/engineering.
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