Research On Data Integrity Of Long Term Health Monitoring Of Bridges

At present, the proportion of bridges in transportation facilities is very large,which has played a very important role in the development of the national economy.However, the bridge operation safety and maintenance becomes more and more complicated with the increase of bridge service life. Therefore, it is an inevitable trend to install the monitoring system for the bridge. But at the present stage, there is no uniform standard for the construction of the monitoring system, and it faces many problems in the application. This paper employs the integrity of monitoring data as a breakthrough point, exploring the principles, methods and technology system of data integrity protection which has exerted profound significance for the evaluation of structural state and the maintenance of bridges.This paper analyzes the factors that affect the data integrity, and establishes the data integrity guarantee technique system in terms of the bridge structure characteristics, monitoring system and the external environment. The main research includes five aspects as follows:1. Based on literature of the bridge monitoring system home and aboard, the definition and content of data integrity of bridge monitoring system are put forward.through reviewing the development trend and application prospect of the bridge monitoring system,and studying the structure of the bridge monitoring system and the advanced methods used in the present study,2. According to the characteristics of types of bridge structure, there proposea data integrity analysis process is showed that can applies to all types of bridge structure system itself. the combination with the design description and structure characteristics, the paper makes the specific analysis of types of bridges, from which the monitoring items integrity requirements are found in the views of the structural characteristics for girder bridges, arch bridge, suspension bridge and combination system bridge.3. In addition, due to the fact that the engineering is affected by the external loadand geographical environment factors, it will lead to different data being collected and analyzed. This paper analyses all possible structural response types of bridge, and consider the impact of the geographical environment factors of the bridge monitoring system, the external influence factors of data integrity were obtained. The principle of data integrity protection under different environmental loads is proposed., and further elaborates the influence of temperature and live load on the data.4. The paper systematically proposed data integrity guarantee technique and system is proposed from the system from the aspects of data level, network level,transmission level and application level. Through the detailed analysis of the components of the bridge monitoring system including the characteristics of the components, the methods of ensuring the data integrity of each component are given separately, and construction of multi-level data integrity guarantee technique system.5. As for the whole life monitoring of the bridge, the research focuses on the similarities and differences between construction monitoring on construction period and the monitoring system on operating period, and making a comprehensive analysis of them. Finally the paper discusses the integrity assurance system of bridge data in the whole life cycle, considering the construction period monitoring data used as an important supplement and reference basis for the monitoring system on operating period.