Research On The Application Of Finite Element Model Updating Technique In Bridge Engineering

Due to such merits as integrality, accuracy, and convenience to be programmed, the finete element method (FEM) has been widly used in civil engineering nowadays. While FEM model of structure is developed, differences inevitably exist between the FEM model and the real structure model. The exact FEM parameters of structure are required in order to get the precise FEM results. The FEM model updating technique is a method that uses some effective measures to update the FEM parameters of structure according to the test data. The application of finite element model updating technique is very wide in bridge engineering. It can be used in damage detection, construction parameter identification, cable force optimization of cable-stayed bridge etc..Based on above cognitions, this thesis mainly focuses on the theory and the application of finite element model updating technique on the basis of the static test data. In the theory part of the thesis, the basic ideals of finite element model updating technique are presented. Moreover, the basic principles of optimization method and the implement of response surface method are involved.On the basis of the theory research progresses, a computer program is developed by author. Two aspects of the application of finite element model updating technique are studied:1. The application of structure damage detection. The basic principle of structure damage detection based on the finite element model updating technique is proposed and the research of damage detection of five pieces of two-span prestressed concrete continuous beam is done. Moreover, the effect of PPR and type of concrete of these beams on the results of the damage detection is considered. According to these researches, some useful conclusions of structure damage detection are concluded.2. The application of construction parameter identification. In this part, some common construction control techniques of bridge structures are introduced and the main reasons and parameters that could cause deviations of bridge construction are analyzed by author. Moreover, the researches have been done on identifications of creep parameters, prestress effects and load effects ofprestressed concrete structures. Finally, a 82+150+82m prestressed concrete continuous rigid-frame bridge is studied to illustrate the problems of construction parameter identification.According to above researches, the correctness of the program and the feasibility of the application of finite element model updating technique in these two aspects are confirmed.