A running test was conducted at the deck girder in order to identify the vibration mode excited by the impact load at the rail joint, and clarify the effect of the rail joint condition on stress at the top and bottom end of the vertical stiffener due to the vibration mode. As a result, it was found that the impact load at the rail joint generated the bending vibration of the main girder and out-of-plane vibration of the web or flange panel, and the rail joint type and the step at the joint affected the stress at the stiffener.
