csys,4 k,81,2,-5 k,82,2,5 k,83,-2,5 k,84,-2,-5 l,81,82 l,82,83 l,83,84 l,81,84
LFILLT,59,60,1 LFILLT,60,61,1 LFILLT,61,62,1 LFILLT,59,62,1
al,59,60,61,62,63,64,65,66 VDRAG,33,,,,,,54,56,55,57,58 asel,s,,,4 asel,a,,,28 cm,a1,area VSBA,5,a1 alls
VSBA,9,a1
VDELE,10,12,2,1 vadd,all fini
六、平面桁架
fini /cle
/filname,truss2,1 /prep7 l=0.1 a=1e-4
ET,1,beam3 R,1,a
MP,ex,1,2e11 mp,prxy,1,0.3 n,1,0,0,0 n,2,l,0,0 n,3,2*l,0,0 n,4,l,l,0 E,1,2 e,2,3 e,1,4 e,2,4 e,3,4 fini /solu
D,1,ux,0,,,,uy d,3,uy,0 F,4,fy,-2000 solve fini /post1
ETABLE,FA,smisc,1 ETABLE,SA,ls,1 pretab,fa,sa PLNSOL,u,y,2 Fini
习题6.1（1）、平面桁架
fini
/cle
/filname,truss3,1 /prep7 a=0.3 b=0.5 x=1e-4 ET,1,beam3 R,1,x
MP,ex,1,2e11 mp,prxy,1,0.3 n,1,-a n,2 n,3,a n,4,0,-b e,1,4 e,2,4 e,3,4 fini /solu
D,1,ux,0,,,,uy D,2,ux,0,,,,uy D,3,ux,0,,,,uy F,4,fy,-2000 solve fini /post1
ETABLE,FA,smisc,1 ETABLE,SA,ls,1 pretab,fa,sa fini
习题6.1（2）、平面桁架
fini
/cle
/filname,truss4,1 /prep7 a=0.3 b=0.5 x=1e-4 ET,1,beam3 R,1,x
MP,ex,1,2e11 mp,prxy,1,0.3 MP,ex,2,1.03e11 mp,prxy,2,0.3 n,1,-a n,2 n,3,a n,4,0,-b TYPE,1 real,1 mat,1 e,1,4 e,3,4 mat,2 e,2,4 fini /solu
D,1,ux,0,,,,uy D,2,ux,0,,,,uy D,3,ux,0,,,,uy F,4,fy,-2000 solve fini /post1
ETABLE,FA,smisc,1 ETABLE,SA,ls,1 pretab,fa,sa fini