Abstract
In order to ensure the ballast stability on the bridge, the upper limit of deck acceleration has been established in European technical standard. However, both of the measurement and simulation in the European past studies have covered only entire bridge dynamics. This study conducted the field measurement up to 374 km/h train running and the numerical analysis by vehicle-bridge interaction model focusing on the deck member local vibration of composite box girder in Italian high-speed railway. As the results, responses related to the high-order deck local vibration modes at 20-30Hz are dominant components in the high speed range exceeding 300 km/h by 7th and 8th resonances with vehicle length. These local resonances cause the 1.3 times greater of maximum amplitude at the deck member than the girder. In addition, the results of numerical study could clarify the impacts of each member specification on the deck acceleration, and lead the method to set the maximum modal number required for the high precision numerical calculation.
