In this paper, a new type damping wall system using torsional steel tube damper is proposed. This proposed system has a feature that we can set the stiffness and yielding strength freely. And we can set any opening for doors or windows where designers want. For the proposed system has stable hysteretic energy absorption, it is important that steel tube damper shows stable hysteresis. But it is known that with large radios-thickness ratio, steel tube damper has small energy absorption ability. So, in this paper, the critical radios-thickness ratio of torsional steel tube damper for large energy absorption is confirmed by FE analysis.
