Research And Application Of Small And Medium Span Bridge Health Monitoring System Based On Sensor Network

Middle and small span the conventional bridge is the most important part ofHighway Bridge on the web in china. Low grade road bridge because the degree ofconcern is low, its status is low and no bridge, no maintenance and repair.The purpose of this study is the online monitoring of the operation state of healthstatus on the conventional bridge, health monitoring system based on sensor networkthrough the establishment of suitable for middle and small span bridge, completedduring the operation of real-time monitoring for these bridges with low cost, makeforecast and monitoring the state of disease development, bridge condition. Providetimely, accurate, scientific basis for the maintenance and management of bridge.Response of highway informatization development trend of national health,establishment of electronic database for the bridge, the bridge for informationmanagement.Design and Research on the content, the middle and small span bridge sensornetwork health examination system based on:1, through the research projects, healthdetection system suitable for small and medium span bridges, conventional;2completed the design of small and medium span bridge health monitoring systembased on sensor networks;3, completed the health status of conventional bridgeevaluation system research and compiling the application software;4, in the projectselected bridge built bridge sensor network demo system health monitoring systembased on.Through the full investigation, in the west of Hainan a number of small andmedium span bridges theoretical research and computer simulation, grasp the maindiseases of middle and small span bridge in high temperature, high humidity, high saltand typhoon climate conditions, study the completion of the monitoring and diagnosismethods of the safety of small and medium span bridges target, main content, methodof early warning and security early-warning threshold value algorithm.According to the research of medium and small span bridge safety monitoringand early warning methods and safety early-warning threshold value algorithm,choosing the strain is a key parameter of health monitoring of small and medium spanbridges, the selection of sensor of fiber grating sensors and resistance strain typesensor as measuring strain. The hardware of medium and small span bridge health monitoring system is designed in detail, including sensor system, data transmissionsystem and power supply system.The system software developed by JAVA language, using B/S pattern, SOAarchitecture, DES data encryption, a computer version and the mobile phone version,providing the bridge state analysis, early warning, query statistics, data exchange andsensor management function.The the project of bridge health monitoring system is composed of sensorhardware system, data transmission system, power supply system and data analysissystem. The hardware system is composed of104resistive sensors and fiber opticsensors and5sets of data acquisition instrument; data transmission system iscomposed of data acquisition instrument within the3G module and Ethernettransceiver; power supply system consists of solar power supply system and powercable system; data analysis and Bridge virtual machine system is provided by theinformation center of Department of transportation Hainan Province health evaluationplatform software. Through the loading test of different axle load of the vehicle, thesystem data meet the design requirements.