Health Monitoring Based On Gps Technology Suspension Bridge Research And Practice

In recent years, with large-scale bridge design, as well as the structure of the soft form and function of the increasing complexity and bridges in the construction and use of process, due to the environment, vehicles, wind, seismic, fatigue, human factors, such as role, as well as the material properties of the continuous degradation of their own, resulting in various parts of the structure to meet the design life is far different on the degree of damage and deterioration. If these injuries should not timely be detected and repaired, impacting the traffic safety and reducing the service life of bridges, while caused heavy damage and a sudden collapse of a bridge. In order to grasp bridge structure of the operation of load-bearing capacity, operation status, safety and durability, there is an urgent need to research structural health monitoring of bridges.GPS technology-based structural health monitoring of bridges, not only effectively reduced the monitoring costs, but also greatly enhanced the flexibility of operation. Structure of the bridge by the state of monitoring and evaluation based on GPS, it provided the appropriate scientific basis serve as the bridge in a special climate, special traffic conditions, abnormal operating conditions of a serious warning signal when the trigger and bridge maintenance, repair and management decision-making, bridge design to verify the theory, and improved the bridge design methods and standards.In this paper, it first introduced large-scale bridge structural health monitoring research status and GPS with the comparative advantages and disadvantages of traditional methods. It also summary GPS used in the bridge health monitoring of a number of key technologies such as location theory, coordinate transformation, data processing.After that, it analyzed displacement which inspired by the more obvious changes in the structure of the suspension and force characteristics in the environment. Then it introduced Qingshui river overview of the project. Finally it introduced ANSYS software which get theoretical modal parameters of the suspension bridge Qingshui river.And then, it proposed suspension bridge structural health monitoring of the basic framework and the design methods and specific technologies by relatively small span bridges of Qingshui river suspension bridge which based on GPS technology. At the same time using data processing software FlexPro8 on experimental data obtained by the study and analysis .Then it analyzed and compared a window function method based on the FIR filter and Butterworth law based on the performance of IIR filters. After, it compared the natural frequency through the test and the theoretical results of ANSYS. It also analyzed the safety assessment of a suspension bridge Qingshui river.Finally, it proposed a summary of the full text, and put forward the direction of further research.