m Bazzaz - Civil Engineering Faculty, Semnan University, Semnan, Iran
a Kheyroddin - Civil Engineering Faculty, Semnan University, Semnan, Iran
M.A Kafi - Civil Engineering Faculty, Semnan University, Semnan, Iran
z Andalib - Civil Engineering Faculty, Semnan University, Semnan, Iran

one of the appropriate procedures to reduce damages in structures is to increase dissipation of seismic energy by the structure to achieve this goal , in the last decade several researchers attempted to introduce various solutions . One of the significant methods regarding this is implementing ductile elements in some point of structure in order to dissipate the energy of an earthquake this element plays the role of a sacrificing element for the structure. this prevents other structural members from getting damaged

seismic behaviour, off-centre bracing, steel ring, steel structure