beam188立柱自振频率与sap2000自振频率相差较大？
模型很简单：一根立柱高6m，截面为Φ203*8钢圆管,底部完全固结，上部完全自由。只提取前3个模态：ansys计算结果如下：
*****INDEX OF DATA SETS ON RESULTS FILE*****
SET TIME/FREQ LOAD STEP SUBSTEPCUMULATIVE
15.4813 1 1 1
25.4813 1 2 2
334.133 1 3 3
sap2000计算结果如下：
Deformed shape(MODAL)-Mode 1-T=0.26148;f=3.82442
Deformed shape(MODAL)-Mode 2-T=0.26148;f=3.82442
Deformed shape(MODAL)-Mode 3-T=0.00520;f=192.19785
出于对结果的怀疑，又用Midas校核了一下，结果基本与sap2000一致。
由于本人理论水平有限，实在搞不懂了。哪位高人给解释下？？谢谢
是否是有可能搞错了参数单位？ TNC 发表于 2014-4-9 09:00
是否是有可能搞错了参数单位？
应该没有，我检查了。都是国际单位建模的。 最好能把命令流贴出来 /PREP7
ET,1,BEAM188
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,20.6e10
MPDATA,PRXY,1,,0.3
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,DENS,1,,7850
SECTYPE,1, BEAM, CTUBE, P, 0
SECOFFSET, CENT
SECDATA,0.0935,0.1015,0,0,0,0,0,0,0,0
k,1
k,2,,,6
l,1,2
CM,_Y,LINE
LSEL, , , , 1
CM,_Y1,LINE
CMSEL,S,_Y
!*
!*
CMSEL,S,_Y1
LATT,1, ,1, , , ,1
CMSEL,S,_Y
CMDELE,_Y
CMDELE,_Y1
!*
FLST,5,1,4,ORDE,1
FITEM,5,1
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
!*
LESIZE,_Y1, , ,20, , , , ,1
!*
LMESH, 1
FINISH
/SOL
!*
ANTYPE,2
!*
!*
MODOPT,LANB,10
EQSLV,SPAR
MXPAND,10, , ,0
LUMPM,0
PSTRES,0
!*
MODOPT,LANB,10,0,0, ,OFF
FLST,2,1,1,ORDE,1
FITEM,2,1
!*
/GO
D,P51X, ,0, , , ,ALL, , , , ,
/STATUS,SOLU
SOLVE
FINISH
/POST1
SET,LIST
SAVE
FINISH
! /EXIT,NOSAV
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