Analytical Attitude on Influence of Skeletal Configuration Geometry of Moment Frame Structures for Calculating of Seismic Parameters of Behavior Factor

In this study, the performance of resistant skeleton of mid-rise moment frames under scaled near-field records have been evaluated. This evaluation was performed by emphasizing on the behavior factor. The studied structures are two buildings comprising of bundled tube frame and 3d moment frame resistant skeletons. The selected strong earthquake records contain forward directivity effects. The selected records contain strong pulses in corresponding velocity time history and applied to the studied structures as three component tremors. The results of this study denote that the variation of structural response parameters, directly depends on the existence of strong forward directivity effects as well as the pulse-like nature of near-field earthquake records. Moreover, the behavior factor and its related parameters entitled ductility, overstrength and strength reduction factors are evaluated and estimated for the studied structures based on utilization of the proposed formulas notified by past researches. Based on the obtained results, it was concluded that the building with 3d moment frame structure is relatively more robust and stable than the other studied structure. Also the estimated ductility factors for the bundled tube structure in both directions of plan are more than those due to the 3d moment frame structure. In addition, the estimated values of the force reduction factors in both directions of plan of the bundled tube structure are more than those ones calculated for the 3d moment frame skeleton. There is an opposite manner for the estimated oversrtength factors related to the both studied structures. Finally, it has been concluded that an analytical convergence between the results related to both of the codified and the estimated behavior factors can be recognized.