Today, due to the architectural imperatives, economic issues, the use of buildings and the requirements of municipalities, the construction of irregular structures is inevitable. Hence, many studies are carried out on these structures for the preparation and explanation of building codes. One of the parameters that has always been mentioned in this research is the seismic intensity parameter, which is a representative the magnitude of force applied to the structure. It should be noted that according to the structural conditions and its elements, different seismic intensity parameters can be used. Therefore, the correct choice of this parameter in research is necessary. In order to investigate the seismic performance of the CSY-damper frames in irregular and regular conditions, eight frame was created and dynamic incremental analysis were carried out and the fragility curves of the frames at different performance level and with two seismic intensity parameters Sa And PGA were produced.
From the comparison of the fragility curves in these two states, it was concluded that, considering the seismic intensity parameter Sa, the seismic performance of the irregular structures was better than the regular model, but the result that obtain from fragility curveof The PGA parameeter, shows contradicts this, and the difference increases with increasing height.