Study On Finite Element Model Modification Method Of Bridge’s Health Monitoring

Bridges can be seen in our daily life everywhere. They play an important role in the transport network. With the growth of the bridge’s service time, its material property degenerates in different degree. Bridge’s carry capacity reduce because of damage accumulation. Once the bridge breaks, it will cause incalculable losses. Therefore, it is important to monitor bridge’s health status. In this paper, related research has been done about the bridge’s health monitoring.Firstly, health monitoring requires bridge’s monitoring data. It is inconvenient to monitor the bridge’s health condition in its local place. A monitoring system is adopted based on GPRS remote data transmission. Monitoring center can receive the bridge’s monitoring data remotely, timely and accurately. These data can be used as test data sample.Secondly, a finite element model is a necessity for analyzing the bridge’s health status. Consequently, a finite element model has been built based on Shi He Bridge’s actual structural condition. Then, the model has been corrected by uniform design combined with response surface method. The error of data obtained from modified model is less than 3% by contrasting static load test data. The result shows that the modified model has high accuracy.Finally, on the basis of modified model, the load is applied which is needed to calculate the operational phase threshold. The bridge’s limit stress value can be got. Therefore, bridge’s health status can be estimate by the value.In this paper, dynamic bridge remote health monitoring has been achieved by integrated use of the GPRS remote data transmission technology and finite element analysis technology. The modified model has a good fit with the actual bridge. The further research work can be done, such as optimal sensor placement algorithms, damage identification according to the model.