In this research, to clarify the behavior of bearing with bearing plate used for 38 years, actual bridge measurements were carried out. As the results, it is clarified that the rotation and horizontal displacement of the bearings were not enough when live load acts. And although the horizontal displacements of the bearings by thermal deformation of the bridge were evaluated as good under global temperature variation, thermal stress acts on the bridge members by restraint of deformation by sliding friction of the bearing under daily temperature variation. Due to the sliding friction behavior of bearings, the thermal stress value is limited, therefore it is possible to evaluate axial force acting on bearing by actual bridge measurement.
