对克拉夫结构动力学p133例题的探索，假设悬臂塔结构承受了水平地震底面运动vg(t)，悬臂塔绝对位移响应为vtt(x,t),悬臂塔的相对位移为vt(x,t)。我们可以由结构动力学理论证明相对位移vt(x,t)的等效荷载可以为一个均布荷载。那么为什么我使用ansys算出来的vtt-vg≠vt？是否是我的命令流有问题？请各位大佬解惑。主要是对悬臂结构固定端施加简协位移的命令流是写对了的吗？

ANSYS悬臂梁固端施加一个简协位移命令流

!!!!!!!!!!!!!!!!定义单元相关属性!!!!!!!!!!!!!!!!!
FINISH
/clear
/filname,JUNBUHEZAI,0
/prep7
!!!!!!!!!定义材料!!!!!!!!! 
Mp,ex,1,2.06e11
Mp,prxy,1,0.3
!!!!!!!!!定义单元类型!!!!!!!!!!
Et,1,beam188
!!!!!!!!!!设定实常数!!!!!!!!!!
PI=2*ASIN(1)
!!!!!!!!!!定义截面属性!!!!!!!!!!!!
Sectype,1,beam,RECT,lz
Secdata,0.2,0.2
!!!!!!!!!!!!!!!!!!!!!!!!!!定义全局参数!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
K,1,0,0,0
K,2,0,0,2
K,3,0.1,0,0
L,1,2LATT,1,,1,,3,,1
LESIZE,ALL,,,20
LMESH,ALL
KSEL,NONE
NSEL,NONE
KSEL,NONE
ESEL,NONE
VSEL,NONE
NSEL,S,NODE,,1
D,1,UY
D,1,UZ
D,1,ROTX
D,1,ROTY
D,1,ROTZ
ALLSEL,ALL
/SOLU !进入求解处理器
NLGEOM,ON
ANTYPE,TRANS
TIMINT,ON   
*SET,DELTT,0.1       !!!!一步的时间  
*DO,I,1,40          !!!!!!!!!!!!!!!!10步  
TIME,DELTT*I
KSEL,NONE
NSEL,NONE
KSEL,NONE
ESEL,NONE
VSEL,NONE
NSEL,S,NODE,,1 
D,1,UX, 0.002*SIN(9*PI*I*0.1)     !!!!对整个结构施加简谐位移荷载
ALLSEL,ALL
SOLVE 
*ENDDO     
save

ANSYS悬臂梁梁上受到均布简谐荷载命令流

!!!!!!!!!!!!!!!!定义单元相关属性!!!!!!!!!!!!!!!!!
FINISH
/clear
/filname,JUNBUHEZAI,0
/prep7
!!!!!!!!!定义材料!!!!!!!!! 
Mp,ex,1,2.06e11
Mp,prxy,1,0.3
!!!!!!!!!定义单元类型!!!!!!!!!!
Et,1,beam188
!!!!!!!!!!设定实常数!!!!!!!!!!
PI=2*ASIN(1)
!!!!!!!!!!定义截面属性!!!!!!!!!!!!
Sectype,1,beam,RECT,lz
Secdata,0.2,0.2
!!!!!!!!!!!!!!!!!!!!!!!!!!定义全局参数!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
K,1,0,0,0
K,2,0,0,2
K,3,0.1,0,0
L,1,2LATT,1,,1,,3,,1
LESIZE,ALL,,,20
LMESH,ALL
KSEL,NONE
NSEL,NONE
KSEL,NONE
ESEL,NONE
VSEL,NONE
NSEL,S,NODE,,1
D,1,UY
D,1,UZ
D,1,ROTX
D,1,ROTY
D,1,ROTZ
ALLSEL,ALL

/SOLU !进入求解处理器
NLGEOM,ON
ANTYPE,TRANS
TIMINT,ON   
*SET,DELTT,0.1       !!!!一步的时间  
*DO,I,1,40          !!!!!!!!!!!!!!!!10步  
TIME,DELTT*I

FDELE,ALL,ALL 
FCUM,REPL 
  
KSEL,NONE
NSEL,NONE
KSEL,NONE
ESEL,NONE
VSEL,NONE
NSEL,S,NODE,,1 

F,1,FX,0.1*7850*0.2*0.2*0.002*9*PI*9*PI*SIN(9*PI*I*0.1),,21,1      !!!!对整个结构施加简谐位移荷载
ALLSEL,ALL
SOLVE 
*ENDDO     
save