evaluation of higher modes effects in estimation of seismic response parameters of tall hybrid mega zipper skeletons

This research investigates the analytical capability and effectiveness of modal pushover method (mpa) in predicting the important responses of high-rise steel buildings subjected to both far and near-field earthquake records. this was performedbased on comparing the predicted values by mpa with the corresponding parameters obtained through comprehensive nonlinear dynamic time history analyses (nlth). for this purpose, three 30-story structural models with rigid castled tuberesistant skeleton were selected and designed. the first studied model is classified as the basic structure with a castled tube structural system and is identified by the ct symbol. the second and third studied models are introduced by setting two different multi-level configurations of large scale zipper elements in the structure of the basic model. the large scale zipperelements are connected to one or two perimeter columns at the first story level and introduced with the symbols mzct-1c and mzct-2c, respectively.