Introduction of vibration control systems for bridges have advantages in terms of both seismic performance and construction cost. In applying the bridge vibration control system, it is necessary to use an appropriate model of the damper for design. The purpose of this paper is to establish the design model for the friction slip damper. The damper tests subjected to calculated response displacements for design earthquake motion were carried out, and the damping force-displacement relation was evaluated. As a result, two design models for the damper were proposed.
