Abstract
Bridge structure plays a very important role in human traffic. The evaluation of bridge structure after a certain period of operation has always been the focus of the bridge. Based on the data collected from the health inspection system of a continuous rigid frame bridge on a highway in Yunnan, China, it is found that there is a certain linear relationship between the deformation and stress of the bridge structure. In view of a specific section of the structure, the stress value of this section can be derived according to its deformation value. The coefficient K can be calculated by comparing the estimated value to the actual measured value. According to the range of the K value, the structural state of the bridge can be evaluated to a certain extent.
Highlights
The research on the monitoring of bridge in the operation period abroad began in 70s
There is some complicated consistency between the vertical deformation of the continuous steel bridge and the structural stress, because there are many kinds of functions involved in the measured structural response, such as live load, shrinkage and creep, relaxation of prestress, bearing Subsidence, temperature and strain and other variable effects
The structure influence line is used to characterize the change of the internal force and deformation of a certain section with the change of the load position
Summary
The research on the monitoring of bridge in the operation period abroad began in 70s. By the mid and late 80s, the monitoring system for the specific installation and operation period of some bridges has been started. Domestic concerns began in 90s, carried out monitoring during operation in jiang yin san jiang bridge, The Second Nanjing Yangtze River Bridge (2001), Runyang Yangtze River Bridge (2000-2004), Su Tong Yangtze River Highway Bridge (2007) [1] and some other large bridge has established the structural health monitoring system. The main functional goal sof the health monitoring system are to realize data compression, index extraction, online warning, formation of maintenance advice and guidance for operation and maintenance. According to the analysis results, it finds a suitable assessment method for such bridges to realize the assessment and determination of the structure
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