Abstract. In the analysis of large structures, usually finite element model according to the blueprint, the finite element model thus created often fail to reflect the true state of the actual structure. It is necessary to establish the finite element model is corrected. Typically, finite element model updating is defined as a rigidity and quality test results of the analysis of dynamic frequency, mode shape modification theory of finite element model parameters to ensure the accuracy of modal parameters premise itself, so that the vibration parameters finite element model corrected tended test values. After finite element model updating can be applied to structural dynamic response and dynamic security analysis again, some vibration control technology control strategy formulation, structural damage identification, the bridge health monitoring and safety assessment, structural optimization design and the like. This paper evaluates the structural model features required by the state of the bridge structure, modeling methods are given to build large span bridges for structural condition assessment model for the bridge structure such as pylon, deck lines and coupling conditions, etc. Finite element simulation and thus to assess the structural state of the bridge.

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The magnitude of the load is the main reason for the direct impact of highway bridge safety. With the increase in transport demand, vehicle overload phenomenon gradually increased. In recent years, repeated heavy vehicles crushed the bridge accident, causing widespread concern in society. In this paper, the load characteristics of the bridge are analyzed by ANSYSY finite element simulation. And provide a useful reference for the design and construction of highway bridge structure.

Abstract. In the bridge maintenance management decision, the health evaluation on bridge structure is far more than determination of abnormal index exceed fixed threshold, or evaluation on damage status and carrying capacity, the on-site human inspection should also be paid attention. In order to achieve more accurate and reliable health status evaluation result, it needs to take full advantage of various information and parameter. The D-S evidence information fusion was used in the paper to present comprehensive bridge health evaluation method. It fuses bridge operation status using abnormal status identification, bridge durability with residual life estimation, as well as human inspection rating, to arrive at health evaluation. The actual application examples to verify the method is also provided.