Damage levels of building structure under a design earthquake are closely related to the assigned values of response reduction factors. The present study focuses on comparison of estimating the seismic Response reduction factor for a RC frame and steel frame. In the investigation, nonlinear static analysis of analytical model of eight story RC frame and steel frame is conducted for local seismic conditions. The analysis revealed that the four major factors Strength factor, Ductility factor, Redundancy factor and Damping factor affect the actual value of the response reduction factor and therefore they must be taken into consideration while determining the appropriate response reduction factor to be used during the seismic design process. Pushover analysis is an advanced tool to carry out static nonlinear analysis of framed structures. It is used to evaluate non linear behavior and gives the sequence and mechanism of plastic hinge formation. Here displacement controlled pushover analysis is used to apply the earthquake forces at C. G. of structure. The pushover curve which is a plot of base shear versus roof displacement, gives the actual capacity of the structure in the non linear range.

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Response Reduction Factor Nonlinear Static Analysis Base Shear.