单元生死的模型，看看哪里不对

springer_

模拟自重时桁架安装，只是一种材料，但为了后边单元生死时选择方便，故而做了6种材料。
但在求解时，每一步的结果都一样。大神帮忙看看是哪的问题？
/prep7
et, 1, beam188
mp, ex, 1, 2.1e11
mp, prxy, 1, 0.3
mp, dens, 1, 7850
et, 2, beam188
mp, ex, 2, 2.09e11
mp, prxy, 2, 0.3
mp, dens, 2, 7850
et, 3, beam188
mp, ex, 3, 2.08e11
mp, prxy, 3, 0.3
mp, dens, 3, 7850
et, 4, beam188
mp, ex, 4, 2.07e11
mp, prxy,4, 0.3
mp, dens, 4, 7850
et, 5, beam188
mp, ex, 5, 2.06e11
mp, prxy, 5, 0.3
mp, dens, 5, 7850
et, 6, beam188
mp, ex, 6, 2.05e11
mp, prxy, 6, 0.3
mp, dens, 6, 7850
SECTYPE, 1, BEAM, I                          
SECDATA, 0.4, 0.4, 0.6, 0.034, 0.034, 0.02
K, 1
K, 6, 34
K, 7, 0, 8
K, 12, 34, 8
CM,D1,KP
K, 2, 5
K, 3, 13
K, 4, 21
K, 5, 29
K, 8, 5, 8
K, 9, 13, 8
K, 10, 21, 8
K, 11, 29, 8

K, 100, 0, 10
L, 1, 2
L, 2, 3
L, 3, 4
L, 4, 5
L, 5, 6
LATT, 1, ,1, ,100, , 1
LESIZE, ALL, 0.5
LMESH, ALL
L, 2, 8
L, 5, 11
LATT, 2, ,1, ,100, , 1
LESIZE, ALL, 0.5
LMESH, ALL
L, 7, 8
L, 11, 12
LATT, 3, ,1, ,100, , 1
LESIZE, ALL, 0.5
LMESH, ALL
L, 3, 9
L, 4, 10
LATT, 4, ,1, ,100, , 1
LESIZE, ALL, 0.5
LMESH, ALL
L, 8, 9
L, 10, 11
LATT, 5, ,1, ,100, , 1
LESIZE, ALL, 0.5
LMESH, ALL
L, 9, 10
LATT, 6, ,1, ,100, , 1
LESIZE, ALL, 0.5
LMESH, ALL
/ESHAPE, 1
/SOLU
CMSEL,S,D1,KP
DK,ALL,ALL
ACEL,0, -9.8,0
ANTYPE,0
NLGEOM,ON
NROPT,FULL
OUTRES,ALL,ALL
ESTIF,1E-6
EKILL,ALL
TIME,1
ESEL,S,MAT,,1
EALIVE,ALL
SOLVE
SAVE,S1,DB
TIME,2
ESEL,S,MAT,,2
EALIVE,ALL
ESEL,S,LIVE
SOLVE
SAVE,S2,DB
TIME,3
ESEL,S,MAT,,3
EALIVE,ALL
ESEL,S,LIVE
SOLVE
SAVE,S3,DB
TIME,4
ESEL,S,MAT,,4
EALIVE,ALL
ESEL,S,LIVE  
SOLVE
SAVE,S4,DB
TIME,5
ESEL,S,MAT,,5
EALIVE,ALL
ESEL,S,LIVE
SOLVE
SAVE,S5,DB
TIME,6
ESEL,S,MAT,,6
EALIVE,ALL
ESEL,S,LIVE
SOLVE
SAVE,S6,DB