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An Auto-Monitoring System Based on the Communicating Pipe Principle of Bridge Deflection

ZENG wei1,YU De-jie1,HU Bai-xue2,LIU Ke-ming3,GUO Jian-wen1 (1.College of Mechanical and Automotive Engineering,Hunan Univ,Changsha,Hunan 410082,China;2.Hunan Communications Research Institute,Changsha,Hunan 410015,China; 3.Changsha Jinma High Technology Industry Ltd,Changsha,Hunan 410013,China)  
Based on the communicating pipe principle,and using the frequency-modulated inductance liquid-level sensor,RS-485 bus,fiber optical communication and computer,an auto-monitoring system of bridge deflection was designed,which realized remote and auto measurement.In addition,it was not affected by the surroundings and human factors.This system has been applied to Dongting Lake Bridge from the beginning of 2004,and the deflection relative error was less than 5%.It has been shown that such a system is feasible and stable.
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