In this study, we conducted on-site measurements of the live load response during train passage in a continuous steel-concrete composite twin box girder bridge. This revealed that the main girder began to tilt due to the static displacement during train passage. When we use the maximum displacement in checking the performance or soundness evaluation of the bridge, it follows that we should consider the measurement points taking into account of the displacement between the outer and inner web sides of the lower flange of a twin box girder bridge in order to select the right ones.
