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The structural seismic responses with viscous fluid damper were investigated for the multi-story steel braced frames. The analytical modeling including brace stiffness ratio was studied for the response of SDOF system using state equation and direct integration method. Displacement responses from two different methods were compared with various support brace stiffness ratio. The results from two analytical methods were almost same and constant responses were shown in the case of 1.0 or more of brace stiffness ratio. Therefore, most efficient value of brace stiffness was 1.0. For the MDOF system application with viscous fluid damper, seismic performance estimation considering the proposed modeling was investigated based on capacity spectrum method (CSM) and inelastic time history analysis. For the different brace stiffness ratio, different performances were shown. Finally, performance results including proposed modeling by the capacity spectrum method were slight different from the results of inelastic time history. It was shown more precise modeling and methodology were required for the performance estimation using capacity spectrum method.