F=aG kB g xo(t)e sIn (t-rdrl max 抗震设计反应谱 C 0.45C a=[20.2-n1(T-5)|am S 00.1 5T 6.0 gF =G max x (t) S g a   = g x t k g max  ( ) =  = k max 0 ( ) 2 max ( ) 2 ( ) sin ( ) 2 1  = − t − t− T g g t d T x e T x t           二、抗震设计反应谱 T(s) 0 0.1 Tg 5Tg 6.0  2  max 45 max 0.  2 max  ( )    T Tg = 2 1 max  [ 0.2  ( 5 )]  = − T − Tg