چكيده به لاتين
In this investigation the Seismic behavior of Staggered Truss structures was evaluated. For this purpose, 15 Models of Staggered truss structures, were varied by the number of stories (4-, 10-, 20-stories) and the length of Vierendeel Panel, were designed in a high seismic risk zone. Then, based on the nonlinear static analysis, the seismic parameters of the structures, such as the over-strength factor, the Ductility factor, and the modification factor, R, were determined. After that the models which have the better seismic performance were elected to evaluate with the base-Isolated state for each model. According to this study if the vertical and diagonal chords remain linear under the seismic loads, the over-strength factor, the ductility factor and the modification factor of the structures greatly increase. Also by increasing the demand/capacity ratios and decreasing the length of Vierendeel panels, the ductility of the structures increases. Nonlinear analysis was also shown that the seismic parameters of structures decrease and the weight of structural materials per unit area increase while the number of stories increase. Fragility analyses on Base-Isolated states compared to basic type of Staggered truss structures shows that the based isolated state by increasing the periods of structures and decreasing the story-shears and story-drifts of structures, the seismic performance will improves in high seismic risk zones.
