Seismic Steel Design 12/9/2012 27.Seismic Design Requirements nt-Resisting fran D(ductile moment-resisting frames,R=5) with limited ductiity,R=2) 用用 Type D&Type MD-Inelastic Response by Dr.Carlos E.Ventura,UBC 5」 Seismic Steel Design 12/9/2012 by Dr. Carlos E. Ventura, UBC 5 Inelastic Response of a Steel Moment Resisting Frame 9 December 2012 28 27. Seismic Design Requirements Moment-Resisting Frames • Type D (ductile moment-resisting frames, R = 5 ) • Type MD (moderately ductile, R = 3.5 ) • Type LD ( frames with limited ductility, R = 2 ) 9 December 2012 29 Type D & Type MD - Inelastic Response PLASTIC HINGE (typ.) 9 December 2012 30 Moment Connections for Seismic Applications by CISC Reduced beam section Bolted end plate - 8 bolts Bolted stiffened end plate – 16 bolts