Numerical Model Updating Technique for Estimating Load Carrying Capacities of High Speed Railway Bridges

The load carrying capacities of railway bridges should be periodically evaluated due to its social significance. Especially, load carrying capacity evaluation for a high speed railway bridge is more needed because of nasty accident. Numerical analysis can be a good tool for evaluating load carrying capacity instead of field test which has limitations such as traffic control, weather conditions, and economic problem. For reasonable evaluating load carrying capacity, numerical model should be reliably updated with accurate measured data. In this study, combined phase model updating technique based on univariate search method was used for model updating. And measuring point roaming method was used for meticulous measurement with limited number of sensor. As a result, it was possible to get similar response from numerical experiment with ambient vibration response from existing bridge. The updated model could be used for estimating load carrying capacity of a bridge.