关于索杆预应力桁架动力学分析
要计算一桁架的固有频率，桁架主结构采用梁单元模拟，四个侧面是张力索，采用link10单元来模拟。下面是命令流，大家帮忙分析一下，哪里有问题？
/BATCH
/PREP7
N,1,,,,,,,
N,2,396,,,,,,
N,3,396,396,,,,,
N,4,0,396,,,,,
N,5,0,0,364.75,,,,
N,6,0,396,364.75,,,,
N,6,396,0,364.75,,,,
N,7,396,396,364.75,,,,
N,8,0,396,364.75,,,,
FLST,3,8,1,ORDE,2
FITEM,3,1
FITEM,3,-8
KNODE,0,P51X
NPLOT
FLST,2,8,1,ORDE,2
FITEM,2,1
FITEM,2,-8
NDELE,P51X
KPLOT
LSTR, 1, 2
LSTR, 2, 6
LSTR, 6, 5
LSTR, 5, 1
LSTR, 4, 3
LSTR, 3, 7
LSTR, 7, 8
LSTR, 8, 4
LSTR, 1, 4
LSTR, 2, 3
LSTR, 6, 7
LSTR, 5, 8
LSTR, 5, 2
LSTR, 1, 6
LSTR, 6, 3
LSTR, 2, 7
LSTR, 8, 3
LSTR, 4, 7
LSTR, 8, 1
LSTR, 4, 5
!*
!*
ET,1,BEAM189
!*
ET,2,LINK10
!*
KEYOPT,2,2,0
KEYOPT,2,3,0
!*
R,1,1.76625,1.415e-3,
!*
SECTYPE, 1, BEAM, CTUBE, sec1, 0
SECOFFSET, CENT
SECDATA,7,8,0,0,0,0,0,0,0,0
SECPLOT, 1,0
LPLOT
FLST,5,20,4,ORDE,2
FITEM,5,1
FITEM,5,-20
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
!*
LESIZE,_Y1, , ,10, , , , ,1
!*
/UI,MESH,OFF
!*
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,70e6
MPDATA,PRXY,1,,0.33
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,DENS,1,,2.7e-6
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,2,,200e6
MPDATA,PRXY,2,,0.3
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,DENS,2,,7.8e-6
TYPE, 1
MAT, 1
REAL, 1
ESYS, 0
SECNUM, 1
!*
FLST,2,12,4,ORDE,2
FITEM,2,1
FITEM,2,-12
LMESH,P51X
TYPE, 2
MAT, 2
REAL, 1
ESYS, 0
SECNUM, 1
!*
FLST,2,8,4,ORDE,2
FITEM,2,13
FITEM,2,-20
LMESH,P51X
FINISH
/SOL
d,9,all
d,10,all
d,89,all
d,90,all
!*
!*
ANTYPE,0
PSTRES,1
/STATUS,SOLU
SOLVE
!*
FINISH
/SOLUTION
ANTYPE,2
!*
!*
MSAVE,0
!*
MODOPT,LANB,10
EQSLV,SPAR
MXPAND,10, , ,0
LUMPM,0
PSTRES,1
!*
MODOPT,LANB,10,0.01,1000, ,OFF
/STATUS,SOLU
SOLVE
FINISH
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