Study On The Modification Method Of Finite Element Model Of Bridge Based On Sequential Agent Model

There are a large number of medium and small bridges in service in China,which is an important part of China’s transportation network.The overall performance of the bridge is deteriorating in the operation process,but the traffic volume of the bridge load is growing,and the requirements for the use of the bridge are also increasing.Therefore,it is necessary to evaluate the overall performance and health of the bridge in service quickly and accurately.The finite element model modification can be used to obtain the reference model which can reflect the real stress state of the structure.Because of its high calculation efficiency and fast modification speed,the finite element modification method based on the sequence agent model is very suitable for the old small and medium-sized bridges.Firstly,this paper introduces the basic theory of the finite element method based on the sequential agent model.Then,based on this method,the finite element model correction software is developed,and the numerical examples are used to verify the efficiency of the sequence agent model fitting and the accuracy of the finite element correction method based on this method.Secondly,based on the experimental data of the scale-up test beam,the finite element model of the scale-up test beam with pre damage is modified,the benchmark model of the damaged beam is found,and the benchmark model is used to establish the finite element model of the strengthened damaged beam.The Gauss distance between the load displacement curve calculated by the finite element model before and after the modification and the load displacement curve obtained by the experiment is compared To evaluate the calculation accuracy and correction effect of the benchmark model in the reinforcement test.The results show that the modified datum model has high accuracy in reinforcement calculation and can be used in practical projects.Finally,based on the load test data of an old simply supported T-beam bridge,The modified model can reflect the actual working state of the bridge,and the modified finite element model can be used for the subsequent reinforcement and repair of the bridge.