THE CONTINUITY PLATE EFFECT ON PANEL ZONE DUCTILITY WITH UNEQUAL BEAMS HEIGHT ON BOTH SIDES OF COLUMN IN SMRF

摘要

Panel zone has a crucial role in transferring the lateral load to other elements in Steel Moment Resistant Frames.To some extent, this element through its ductile behavior can greatly increase the overall ductility of SMRF.Taking benefit of this ductile behavior in panel zone design, one can highly increase the performance of SMRF.Continuity plate has a fundamental effect in ductile behavior of panel zone. The effect of continuity plate on panel zone behavior has been investigated under monotonic loading in the past. The main aim of this paper is an analytical study on panel zone ductility due to presence and absence of continuity plate and type of continuity plate arrangement. The research method is based on verifying the analytical model, built in ANSYS Finite Element Software, with experimental model in laboratory test. This verification permits us to make different models with variety of geometry parameters of panel zone (i.e. depth of beams and thickness of column flange,presence & absence of continuity plate and arrangement style of continuity plate).Then the obtained ductility ratio from analysis is used for consideration of panel zone ductility of FEMA356 and comparison of panel zone ductility due to presence and absence of continuity plate and type of arrangement. The obtained result that is derived from this research shows that the amount of panel zone ductility estimation in FEMA356 in most of geometry cases is non conservative. In most of geometry conditions, presence of continuity plate increase panel zone ductility. Presence of inclined continuity plate that is located in front of bottom flanges of unequal beams sizes (with inequality in height of beams) in which height of shallower beam is equal or less than half of the height of deeper beam, according to partial ductility of panel zone is more effective than the horizontal continuity plate, whereas presence of two straight continuity plate that is located in front of bottom flanges of unequal beams sizes(with inequality in height of beams) in which height of shallower beam is equal or more than half of the height of deeper beam, panel zone has more ductile behavior than the inclined continuity plate.