Effect Analysis Of The Structural Damage And Heavy Load Vehicle Based On The Health Observation System Of Baishazhou Bridge

With superior skills and excellent self-crossing advantages of cable-stayed bridge ever to span direction, the Chinese Su-Tong Yangtze River Highway Bridge is the world’s largest cable-stayed span, the main span has reached1088m.These long-span bridges which is in operation not only encroach by the external environment and the harmful chemicals, but also to withstand the dynamic loads, such as vehicles and wind loads, causing the composition of the bridge to have the varying damage, thus causing the supporting capacity of structure to drop or lose, so we need to carry on the corresponding damage analysis for the bridge in operation, establishes the long-term health observation system. Meanwhile, the traffic flow is increasing along with the rapid growth of economical and highway traffic, so we also need to carry on the corresponding simulation analysis of the car to establishes the corresponding observation system of the car.This paper takes Baishazhou Bridge which is in operation as engineering background, providing a theoretical basis for the establishment of long-term health monitoring system by the structural damage and heavy vehicle effects. The main work and the results of research in this paper can be summarized in the following three aspects:1st, I establish a Spatial Finite Element Model of the Baishazhou Bridge by following the long-span hybrid girder cable-stayed bridge requirements, which is getting to the reasonable state of Baishazhou Bridge. At the same time, I get the Baseline Finite Element Model by model updating.2nd, I simulate the performance impact of the damage for this bridge by the baseline finite element model, obtained the correspondence between the damage location, damage extent and peak,getting to the qualitative judgment of damage location and extern based on the location of the damage peak and the size of the damage. 3rd, I establish the finite element model of the heavy trucks by the baseline finite element model and the Saint-Venant principle, verifying the overloaded vehicles which is traveling on the bridge to make the bridge force more adverse from the stress and strain, the impact of peak will increase accordingly with the increase of car tonnage.