Research Of Bridge Structural Damage Monitoring System Based On WSN

As countries continue to improve the investment of infrastructure construction in bridgestructures, as well as growing concern about the safety of large structures, structural damagemonitoring technology has become a hot research field of engineering at home and abroad.Structural damage monitoring system has been widely used in large bridges. Traditional wiredmonitoring methods require significant wiring, which will increase the load of the object, andthe maintenance work of the latter system is quite cumbersome. Using wireless sensornetworks to achieve deployed and networking of sensor nodes, not only can avoid problemsdue to the complicated wiring and environmental damage caused, but also can extend thedistance of information transmission. Through the processing and analysis of sensorperception information, the damage of the structure can be obtained in a timely manner, and isone of the best solutions to achieve bridge structural damage monitoring online.Based on the characteristics of multi-parameter automatic monitoring technology forbridge structures, using new wireless network technology, this paper designs WSN-basedbridge structural multi-channel damage monitoring system, the main work is as follows:(1) By analyzing the background and current situation of bridge structural damagemonitoring, the WSN is applied to the monitoring system. Use ZigBee wirelesscommunication technology for system networking, and design a ZigBee-based doublewireless sensor network topology to efficiently conduct a comprehensive remote monitoringof the actual large and complex structures.(2) For diversity of bridge structures acquisition signal, an independent multi-channelsensor acquisition module is designed, multi-channel design of the module cansimultaneously sent many different collected signals to a WSN node. WSN nodes, Sink nodes,gateway nodes of the system use a highly integrated system-level CC2530RF transceivermodule that TI has introduced as the core of data processing and wireless transceiver. UseCC2530excellent RF performance, and industry-standard enhanced8051MCU core to realizemulti-channel data processing and wireless communication function, and enhance theavailability of the system.(3) In the IAR development platform environment, the lower position machine softwareis completed by using C language, designed to meet this article requirements of softwareprogramming, which includes multi-channel sensor acquisition, wireless communication andserial communication program. The virtual instrument LabVIEW is used of developinghuman-computer interaction interface for the host computer. The whole monitoring interface is divided into serial operation, parameter setting, each parameter display window. Theseparate installation program generates four parts, realizing user management, node selection,data stored queries, remote monitoring and many other features.(4) Take piers of the substructure of the bridge for example, the dynamic impact damagemonitoring test is done on the pier model by simulating car hitting the pier. Reasonable tobuild a car-Pier impact test platform and optimal layout the sensor element according to thecharacteristics of the dynamic response of the pier structure, collecting structural stress, strainand displacement response and other parameters. Step by step through wireless nodes to senddata to the gateway node, and finally the gateway node through the serial communication tosend the final data to the PC display. Adopting pattern recognition method, by analyzing thedamage characteristics parameters of pier structure under different circumstances, determinethe injury of pier.