Research On Wireless Monitoring System And Forecast Model Of Durability For Concrete Bridge Structure

Concrete structure is currently the most widely used architectural structure inbridge construction, while its performance in which the natural environment and theoperating environment have a complex influence is often overestimated. Recent decadeshave witnessed many concrete bridge accidents, so that the structural durability issuesdirectly affected by the environment has gradually had more and more attention andstudy.To achieve the real-time status monitoring and analysis for the structure of thebridge, and to provide the basis for the maintenance and management of bridge, thedurability of bridge monitoring system comes into being, and the application ofinformation technology has begun to appear particularly urgent.Based on the research of the monitoring status about the durability of concretebridge structure, the dissertation analyze the impact of the environmental and trafficfactors on the durability of concrete bridge structures, designed the monitoring programof structural durability.At first, analyze the design requirements of the durability and keytechnologies of wireless monitoring, set up the overall program of wireless monitoringsystem, and achieved the hardware design and software design. In addition, thedissertation realized the debugging and real-time data collection of nodes. Then, thedissertation selected the main dynamic characteristics of concrete structures-vibrationacceleration as the main object of study. On the basis of the analysis about variousnatural and traffic environmental factors, the dissertation established correlationanalysis between vibration and these. And based on the date from the syestem, bymultiple linear regression and GM-RBF method a predictive model on the vibrationacceleration are established. All of these have contributed to further realize theconfrontation and analysis of the modal identification between the monitoring vibrationvalues and healthy bridge vibration acceleration values, to provide the basis to determine the durability of the bridge.Finally, dissertation completed the design of adatabase based on structural durability Access database system for storing andmanaging of wireless sensor node monitoring data,and designed monitoring andmanagement system based on B/S structure, to accomplish the visualizationmanagement of monitoring data for structural durability.The dissertation based on the wireless sensor technology, accomplished theformation of a wireless sensor network, monitored the relevant parameters of the bridgein view of building the wireless monitoring system of durability for concrete bridgestructure, further explored the issues between environmental factors and durability ofvibration parameters, established predictive model of one of structural durabilityfactors-vibration acceleration, and developed the management systems of structuraldurability information. All of these laid the foundation for the analysis of structuraldurability, and ultimately achieved the maintenance for safe, long-lasting operations ofconcrete bridges.