Study On Vehicle-curved Bridge System Experiment And Damage Identification Of Curved Bridge

With the rapid development of China's transportation industry,curved bridges have been widely used in engineering construction.During its service period,it may be affected by vehicle loads,the environment,etc,and damage may occur.After the damage,if the maintenance is not carried out in time,the damage will become more and more serious.When the damage accumulates to a certain degree,the durability and bearing capacity of the bridge will inevitably be reduced.In severe cases,the bridge's safe operation will be affected,and even a collapse accident will occur.Therefore,it is of great theoretical significance and practical value to study fast and efficient damage identification indicators.Main research content:(1)Car-curve box-girder bridge coupling system model test is performed,and the corresponding finite element model is established.The experimental results are compared with the calculation results of the finite element model to verify the correctness of the finite element model;(2)Based on the finite element model of the vehicle-curve bridge coupling system,the method of reducing the elastic modulus of the damage site element without considering the mass loss is used to simulate the damage,and the sensitivity of the frequency,dynamic deflection,and dynamic strain to the damage is analyzed.Damage identification index based on dynamic deflection change rate and dynamic strain change rate;(3)Using the damage identification index based on the dynamic deflection change rate and dynamic strain change rate,the support vector machine(SVM)in MATLAB is used to train the damage position recognizer and damage degree recognizer to identify the damage position and damage degree.