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Computers and Concrete Volume 35, Number 2, February 2025 , pages 193-202 DOI: https://doi.org/10.12989/cac.2025.35.2.193 |
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High order modal extraction for bridges based on vehicle frequency changes of vehicle-bridge interaction |
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Jingchao Wang, Yixin Chen, Zulin Huang and Xiaokun Tan
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| Abstract | ||
| The extraction of bridge frequency is the most crucial step in the indirect measurement method based on vehicle bridge coupling. However, the body signals of the test vehicle collected using this method often only obtain the fundamental frequency (the first order bridge frequency) of the bridge, while high-order bridge frequencies are difficult to identify and extract. by studying the higher-order bridge frequencies, a more comprehensive understanding of the vibration characteristics of the bridge structures can be obtained, and a more accurate assessment of the health status of the bridge structures can be made. This article proposes a method for extracting high-order frequencies of bridges by changing the parameters of the test vehicle to adjust the frequency of the vehicle. Firstly, change the mass and stiffness of the test vehicle to increase the vehicle frequency to be greater than the first order frequency of the bridge and closer to the second order frequency. Then, quickly collect the vehicle body signal when the test vehicle passes the bridge. Finally, use signal processing techniques such as bandpass filtering to extract the second order bridge frequency of the bridge, and the remaining higher order bridge frequency can be obtained similarly. This paper uses changing vehicle frequency to excite the vibration of high-order frequencies of bridges. Theoretical derivation and numerical simulation verification show that the proposed method can effectively enhance the vibration of high-order modes of bridges, with obvious recognition effect, strong noise resistance and high efficiency, which can promote the application of indirect measurement method in bridge structural health monitoring. | ||
| Key Words | ||
| bridge engineering; high order bridge frequency; indirect measurement method; numerical simulation; test vehicle frequency | ||
| Address | ||
| Jingchao Wang: School of Architecture and Materials, Chongqing College of Electronic Engineering, Chongqing, 401331, China Yixin Chen: 1) State Key Laboratory of Bridge Engineering Safety and Resilience and Key Laboratory of Bridge Earthquake Resistance Technology, Ministry of Communications, PRC, Chongqing, 400067, China, 2) China Merchants Chongqing Communications Technology Research & Design Institute Co., Ltd., Chongqing, 400067, China, 3) Chongqing Wukang Technology Co., Ltd., Chongqing, 404100, China Zulin Huang: Chongqing University of Science and Technology, China, Chongqing, 401331, China Xiaokun Tan: China Southwest Architectural Design and Research Institute Co., Ltd., Chengdu, China | ||