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State of arts on state parameter monitoring of bridge structures

YANG Jian-chun, CHEN Wei-min s, Ministry of Education,Dept of Optoelectronic Engin, Chongqing University, Chongqing 400044, China)  
During the last several decades, the deterioration and damage of bridge structures, which will most likely result in the loss of property or human life, have become a major problem facing the national ministry of transportation and roadway. In order to effectively maintain bridge structures and discover the insecurity factors in time, monitoring the key state parameters in bridge structure and diagnosing the damage are very important.Present technologies of internal strain, deflection, vibration parameters monitoring of bridge structure are reviewed. The sensing principle, characteristics and application for different monitoring methods are analyzed. Some suggestions of monitoring the key state parameters in bridge structure are proposed.
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