This paper presents the development of stud-type damper composed by visco-elastic material and two steel columns. The advantages of the damper are as follows. (1) Since visco-elastic material is used, a high damping effect is expected even if the amplitude at the time of vibration is small. (2) Stud-type gives high flexibility to floor planning. This damper and beam are connected by means of split-T and high-strength blots. The results of the full-scale loading tests revealed the stable hysteretic behavior and energy dissipation capacity of the damper as well as the validity of the strength values and the energy dissipation capacity estimated from the assumption that two steel columns are rigid.
