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各位，我做了一个简支梁跨中集中质量承受简谐荷载作用，得到的结果怎么和结构动力学的结果差别那么大呢？
FINISH
/CLEAR
/PREP7
! 单位 kg-m-s
!定义常数
M=2! c点质量块
FP=10 !简谐荷载的峰值
W=0.5 !简谐荷载的频率
V0=10 !初始加速度
a=1 !半杆长
! 建模
K,1,
K,2,A
K,3,2*A
l,1,2,$L,2,3
!定义单元相关
ET,1,BEAM3, !2D LIANG
ET,2,MASS21
!KEYOPT,2,3,4 !2D无转动惯量质量单元
MP,PRXY,1,0.3
MP,EX,1,4.8e5
R,1,0.4,0.01,0.2
R,2,0,m,0
LSEL,ALL
LATT,1,1,1,,,,
LESIZE,ALL,,,1
ALLSEL,ALL
LMESH,ALL
TYPE,2
REAL,2
E,2
! 施加约束
DK,1,UX,,,,UY
DK,3,UX,,,,UY
!瞬态分析
/SOLU
antype,trans
outres,all,all
*DIM,fyy,ARRAY,20,1,1, , ,
*CREATE,fyyy
*VREAD,fyy,'fy','txt',' ',1, , , , , ,
(F15.3)
*END
/input,fyyy
timint,on
*do,i,1,20,
kbc,1
nsubst,1,20
fk,2,fy,-fyy(i)
time,i
lswrite,i
*enddo
lssolve,1,20
finish
/post26
nsol,2,2,u,y
nsol,3,2,rot,z
plvar,2,
fy为txt文件
10.00000000
8.775825619
5.403023059
0.707372017
-4.161468365
-8.011436155
-9.899924966
-9.364566873
-6.536436209
-2.107957994
2.836621855
7.086697743
9.601702867
9.765876257
7.539022543
3.466353178
-1.455000338
-6.020119027
-9.111302619
-9.971721562
-8.390715291
-4.75536928
0.04425698
4.833047588
8.438539587
9.977982792
9.074467815
5.949206633
1.367372182
-3.549242668
-7.596879129
-9.784534628
-9.576594803
-7.023970575
-2.751633381
2.194399632
6.603167082
9.395248937
9.887046182
7.958149698
4.080820618
-0.795635673
-5.477292602
-8.817917275
-9.999608264
-8.733046401
-5.328330203
-0.61905294
4.241790073
8.064094939
9.912028119
9.333151121
6.469193223
2.021351204
-2.921388087
-7.148869688
-9.626058663
-9.746452757
-7.480575297
-3.38319211
1.542514499
6.090559761
9.147423578
9.964679076
8.342233605
4.677318402
-0.132767472
-4.910347239
-8.485702748
-9.983462274
-9.036922051
-5.877828136
-1.279636896
3.631854084
7.654140519
9.802426408
9.55073644
6.960693099
2.666429324
-2.280669345
-6.669380617
-9.425194911
-9.873392775
-7.904239742
-3.99985315
0.883836993
5.551133015
8.859318073
9.998433086
8.689582973
5.253219888
0.530685362
-4.321779449
-8.116121923
-9.923354692
-9.301004142
-6.401443395
-1.934586046
3.005925437
7.210481539
9.649660285
9.72626565
7.421541968
3.299765977
-1.629907808
-6.160523317
-9.182827862
-9.956855884
-8.293098329
-4.59890107
0.221267563
4.987262179
8.532201077
9.988159581
8.99866827
5.805989127
1.191801354
-3.714180955
-7.71080223
-9.819550195
-9.524129804
-6.896870271
-2.581016359
2.366760373
6.735071623
9.454402446
-0.971969067
-8.645438741
8.167513032
1.847669319
-9.705316516
6.230004213
4.520123427
-9.992074343
3.79621683
6.832507094
-9.482869255
1.06002499
8.600617162
-8.218264239
-1.760607832
9.683606999
-6.298997006
-4.440991644
9.995206253
-3.877955282
-6.767608608
9.510593108
-1.147997863
-8.55512175
8.268371568
1.673408407
-9.661138797
6.367496289
4.361511922
-9.997555067
3.959389907
6.702179899
-9.537571832
1.235880794
8.508956067
-8.317831093
-1.586077874
9.637913673
-6.435496697
-4.281690488
9.999120601
-4.040514324
-6.636226093
9.563803315
-1.323666897
-8.462123731
8.366638939
1.498623077
-9.613933445
6.502992902
4.201533596
-9.999902731
4.121322179
6.569752357
-9.5892855
1.411349294
8.414628412
-8.414791282
-1.411050867
9.589199991
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发表于 2014-3-31 22:27
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