Study Of Baseline Model Based On Cable-Stayed Bridge Health Monitoring

In recent years,the health monitoring and safety evaluation of Cable-stayed bridge structure has become a hot issue,so more and more scholars and experts have been joining in research of this field, however,the establishment of a cable-stayed bridge finite element "baseline model" is the basis and the premise of the implementation of health monitoring and safety evaluation. For real-time analysis and health monitoring of the working condition of a bridge,It needs to build a bridge,which can reflect the real performance of the baseline model. Therefore,it is particularly important to establish a state baseline model that can reflect the bridge into the bridge condition.In addition, due to it is more complex that the sudden accident, overload, earthquake and environmental factors impact on the health of bridge structure, So it needs to master the overall changes of a bridge in working state so as to carry on the real-time monitoring, it can not only provide appropriate reinforcement and reconstruction and maintenance for cable-stayed bridge structure when it is necessary, in order to ensure its continued safety work, it can also avoid the catastrophic accidents.To better address the above issues, this thesis takes the cable-stayed bridge of wuhu Yangtze river bridge as an example, bases on the finite element analysis software ANSYS, establishs a finite element entity model of cable-stayed bridge, through the correction of the initial finite element model, it finally determines that the revised model can be used as a " baseline model" of bridge health monitoring. This thesis mainly divided into the following contents:(1)According to the design drawing size and material properties, the initial finite element model is set up;(2)After the correction of the initial finite element model of cable force and the bridge deck line, it can obtain the initial equilibrium configuration of the bridge, which makes the result of theoretical calculation of the model that can accurately describe the structure of the bridge state;(3)For dynamic and static load analysis of the finite element model, through the contrast test selecting reasonable parameters for correction of the model, and combined with the dynamic and static load test data, it can confirm that the model has a good reliability.Through to the initial model correction of cable-stayed bridge "baseline model", which can make use of the " baseline model " monitoring of the structure of the actual working condition, in order to timely maintenance and repair of cable-stayed bridge.