PARAMETER IDENTIFICATION USING MODEL UPDATING TECHNIQUE FOR HIGH SPEED RAILWAY BRIDGE

초록

A numerical model for an existing bridge should be modified for well reflecting characteristics of the existing bridge. In this study, a numerical model updating method based on univariate search method is introduced. The identification of dynamic characteristics is one of most important part in the process of model updating. And, many measured responses from a large number of measurement points can be helpful to get reliable dynamic characteristics. Therefore, in this study, measurement point roaming method which can be used for a large number of measurement points with a few sensors had been applied for measurement from existing bridges. Cross correlation technique and proper orthogonal decomposition technique have been used for identifying natural frequencies and mode shapes, respectively, with measured signals. After updating of numerical model with introduced model updating method, numerical experiments for dynamic stability analysis have been performed with updated numerical models. As results, it was possible to analyze the dynamic stability when the travel speed is over 400km/h of difficult velocity to be operated on existing bridges.