| The purpose of finite element model(FEM)updating is to identify and correct uncertain parameters of finite element model that leads to the better predictions of structural real responds. It can be used in detection of bridge, structural health monitoring, evaluation for existing Bridges et.al. The study of FEM updating has huge impact on theoretical analysis and great value on practical application.In this paper, focused on the objective function of optimization and FEM updating, a kind of new objective function of optimization is put forward, which applied influence line of deflection from static testing.The new method of FEM updating have advantages of being able to utilize influence line.The main works included as follows:â‘ The conception of FEM updating was introduced.The development of FEM updating techniques and the main problems unsolved at present,were reviewed briefly. A variety of essential method of FEM updating was summarized detailedly.The related aspects and procedures of FEM updating was mainly discussed.â‘¡The conception and computation of influence line was reviewed,and procedures of FEM updating based influence line of deflection was discussed. A kind of new objective function of optimization, which applied sum of residual vector of influence line of structure deflection,and selection of updating parameters, was mainly proposed .Two simulated simply supported beam was used to verify influence line of deflection based FEM updating procedure,and structural damage localization using correlation vector was discovered.The corresponding results showed that FEM updating based influence line of deflection was feasible, effective and accuracy.â‘¢The influence line of deflection based FEM updating is successful to update the five finite element models of the simply-supported beams tested ,which had different damages in the laboratory.The results showed that the influence lines of deflection from FEM after updating are accord with those from testing.
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