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基本过程：
1、建模
2、静力分析
NLGEOM,ON
PSTRES,ON
3、求静力解
4、开始新的求解：modal
PSTRES,ON
UPCOORD,1,ON 修正坐标
PSOLVE...
5、扩展模态解
6、察看结果
/PREP7
ET,1,BEAM189 !使用beam189梁单元
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,210e9
MPDATA,PRXY,1,,0.3
MPDATA,DENS,1,,7850
SECTYPE, 1, BEAM, RECT, secA, 0 !定义梁截面secA
SECOFFSET, CENT
SECDATA,0.005,0.01,0,0,0,0,0,0,0,0
K, ,,,, !建模与分网
K, ,2,,,
K, ,2,1,,
LSTR, 1, 2
LATT,1, ,1, , 3, ,1
LESIZE,1, , ,20, , , , ,1
LMESH, 1
FINISH
/SOL !静力大变形求解
ANTYPE,0
NLGEOM,1
PSTRES,ON !计及预应力效果
DK,1, , , ,0,ALL, , , , , ,
ACEL,0,9.8,0, !只考虑重力作用
TIME,1
AUTOTS,1
NSUBST,20, , ,1
KBC,0
SOLVE
FINISH
/SOLUTION
ANTYPE,2 !进行模态求解
MSAVE,0
MODOPT,LANB,10
MXPAND,10, , ,0 !取前十阶模态
PSTRES,1 !打开预应力效应
MODOPT,LANB,10,0,0, ,OFF
UPCOORD,1,ON !修正坐标以得到正确的应力
PSOLVE,TRIANG !三角化矩阵
PSOLVE,EIGLANB !提取特征值和特征向量
FINISH
/SOLU
EXPASS,1 !扩展模态解
PSOLVE,EIGEXP
FINISH
/POST1
SET,LIST !观察结果
FINISH
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