Seismic Influnce Coefficient Curve How to simplify the real building toamodel? The Power Index of the curvilnear decrease sectio In two main direction.Some time sdir.And Ydi 7=0.9+8i of declined slope %=1+80流205 BSM Assumption tical and F1-8 G Efficient Weight RSM 1.Without Torsion vibration For SDOM.G-G .For MDOM.G G,? and Based on G:Represent Weigkt G,=Gu+Lw w(T Bunch or balls 3 Seismic Influnce Coefficient Curve The Adjusting coefficient of declined slope . . . 0 05 0 9 0 3 6 x g x - = + + .0 .0 1 0 5 0 2 4 32 x h x - = + + .0 .0 . 2 0 5 1 0 8 1 6 x h x - = + + The Power Index of the curvilinear decrease section: The damping adjusting factor h2 ³ 0.55 and How to simplify the real building to a model? In two main direction. Some time is X dir. And Y dir. 框架梁 框架梁 框架梁 框架梁 框架柱 PKPM 3D model Simplification of regular structure. 质量 刚度 X 向 X 向 Kx m 质量 刚度 Y 向 Y 向 Ky m BSM Assumption： Regularity in vertical and plan； Height less than 40m； First mode shape is in dominant; High modes effects are concerned。 n n Ek n Ek n j j j i i i Ek eq F F F G H GH F F G d d a D = = - = å= (1 ) 1 1 Geq Efficient Weight n For SDOM, n For MDOM, Geq i =0.85 G n i å Geq 1 =G G i ? Gi Represent Weight Gi =Gki+ L ji ki Live Load combination factor roof loads: 0.0 or 0.5 or 1.0 For floor loads: 0.5 or o.8 hook loads: 0.0 or 0.3 ( Table 5-4) ji RSM q Important and dominant； q Based on Elastic response spectra analysis q Used for elastic structure q Plan regularity q Bunch or balls 1. Without Torsion vibration