Research On Dynamic Deflection Application In Bridge Health Monitoring System

In recent ten years, china experiences a brilliant period in long-span Bridges construction. A large amount of long-span Bridges with novel structure, complex technology, difficult construction, high grade modern, and high technology built one after another. How to monitor the condition of new bridge, how to evaluate the health condition of old bridge, and how to forecast lesions accurately of the bridge structure, and so on, is an important task in the bridge managers. A bridge health monitoring system, combined with civil engineering, information engineering, computer engineering, and other disciplines and fields of high-end technical knowledge, can realize the real-time monitoring of the bridge operation and a better management network of numerous Bridges, which can greatly reduce the country’s financial pressure. Deflection deformation as a description form, which can evaluate the quality of bridge and the operation condition and reflect the stiffness of the bridge, is the bridge’s the most obvious deformation of the reaction. Especially the dynamic deflection of the bridge, which is the best real time response in bridge rigidity, is the best real reaction under the vehicle loads.This paper divided into four parts, the first part is the research of bridge health monitoring, dynamic deflection measurement system, and the advantages and disadvantages of the application of dynamic deflection; The second part research and development a new type of dynamic deflection measurement system; The third part is the theory research of dynamic deflection, based on the application of dynamic deflection of the bridge health monitoring system; The fourth part is the research of the early warning model monitoring system. The third part is the most important in this paper, which based on the research of the simple supported beam system and combined the theoretical derivation with ANSYS finite element analysis, research dynamic deflection changes in law; This paper also establish the construction damage of simply supported beam and analyzes the change of various index structure; Above this study, we can determine the direction of its applications, monitoring and evaluation development; this paper also Introduces the wide highway ZhaoWangXin river bridge’s bridge health monitoring system, through the ANSYS finite element modeling and the bridge vibration data, using the optimization analysis method, establishes the standard finite element model of the bridge. Combined with the needs of bridge health monitoring, this paper provides a bridge health monitoring model and prediction warning model. In order to validate the accuracy of the models, this paper uses the data of baotou Yellow River bridge, establish the temperature load and aging component deflection calculation formula, and through the analysis, obtained some conclusions.