ABSTRACT
Nowadays pushover analysis has great importance among the methods for the evaluation of the seismic response of structures. Unfortunately, it provides results which sometimes strongly depend on the type of analysis of the generic step (static or modal) and on the load pattern. In the present paper the response of different typologies of seismic resisting frames is analyzed by means of pushover and step-by-step dynamic analyses at the aim of highlighting such differences. The results of the dynamic analyses of Moment Resisting Frames, Eccentrically Braced Frames and Tied eccentrically Braced Frames are compared with those obtained by means of pushover analyses in which different invariant and adaptive load patterns are used. The comparison of such results allows some interesting observations regarding the range in which the pushover analysis, with appropriate load patterns, provides a good estimation of the dynamic seismic response.
