ABSTRACT
Criteria for the evaluation of the response of moment resisting steel frames subjected to earthquakes are proposed. The criteria are used for the definition of the ultimate state of the structure. They relate to serviceability and ductility requirements. A parametric study on the response of several frames is performed. The parameters under consideration are the frame geometry, the level of vertical loading and the type of seismic record. It may be seen that the current serviceability criteria set up in the seismic Codes are governing the design, as long as minimum ductility requirements for the members and the connections are met.
