Research on the Deformation Monitoring Method of Eaves Board of No-plateform-column Canopy with Distributed Optical Fiber
ZHANG Hao1, ZHANG Lei2, ZHAO Weigang1, ZHANG Guangyuan1, LIU Boqi3
1. Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; 2. Hebei Institute of Architectutal Design & Research Co. Ltd, Shijiazhuang, Hebei 050011, China; 3. Railway Engineering Research Institute of China Academy of Railway Sciences Corporation Limited, Beijing 100081,China
Abstract：Research purposes: No-plateform-column canopy is widely used in high-speed railway stations in China. Under the long-term influence of wind load, eaves board, roof panels and other structures are easy to loosen, warp or even fall as a whole, affecting the safety of railway operation. In the daily maintenance of canopy, there are some problems such as the limit of skylight point, the blind area of maintenance and the lack of maintenance means, so it is urgent to find an effective method to monitor the canopy structure. The distributed optical fiber sensor has the characteristics of full distribution and is suitable for health monitoring of large area eaves board. Based on the finite element software ANSYS, the stress and deformation of the canopy and its eaves board when the high-speed railway passes the station are simulated and analyzed, the layout scheme of optical fiber sensor is designed, and the damage and deformation of the eaves board are monitored through model test. Research conclusions: (1) Under the action of train wind, the eaves board bears the impact of two times of alternating positive and negative pressures when the front and rear of the train pass by. (2) Under the condition of rivet damage at the boundary of eaves board, the distributed optical fiber sensor can effectively monitor the deformation process of the eaves board. The damage was accurately located and the alert threshold of deformation was determined according to the strain variation of the fiber. (3) The stiffening ribs on the board can obviously restrain the deformation and deformation transmission of the eaves board, and can prevent the expansion of the damaged area to a certain extent. (4) The research results can provide reference for health monitoring of railway platform canopy eaves board and other plate and shell structures.
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2022, Vol. 39 
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