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用梁格法建模，向下的均布荷载，但是模型出来的弯矩图是反的，不知道哪里出了问题？下面是命令流，求大神帮忙看看 /prep7 et,1,82 mp,ex,1,3.45e4 mp,prxy,1,0.2 mp,dens,1,2550 !箱梁截面 K, ,0,1,0 K, ,0,1.4,0 K, ,2.45,1.4,0 K, ,2.45,0.4,0 K, ,0.3,1,0 K, ,2.45,0,0 K, ,3.35,1.4,0 K, ,3.35,0,0 K, ,2.59,0.28,0 K, ,2.59,1.1,0 K, ,2.69,1.2,0 K, ,3.11,1.2,0 K, ,3.21,1.1,0 K, ,3.21,0.28,0 K, ,3.11,0.18,0 K, ,2.69,0.18,0 K, ,3.35,0.32,0 K, ,5.87,1.4,0 K, ,5.87,1.26,0 K, ,4.55,1.26,0 K, ,3.35,1.08,0 K, ,5.87,0.12,0 K, ,5.87,0,0 a,1,2,3,4,5 a,9,10,11,12,13,14,15,16 a,3,7,8,6 asba,3,2 a,7,18,19,20,21 a,8,17,22,23 agen,1,1,6, ,-2.9,-1.4 , , , ,1 aadd,all asel,all esize,1 amesh,all secwrite,jm3,,,mesh finish /clear /prep7 et,1,44 mp,ex,1,3.45e4 mp,prxy,1,0.2 mp,dens,1,2550 sectype,1,beam,mesh secread,jm3,,,mesh secoffset,origin *do,i,1,11,1 K,i,(i-1)*1 *enddo K,100,0,1 *do,I,1,10,1 L,I,i+1 Latt,1, ,1, ,100,,1 Lsel,s,,,i Lesize,I,,,10 Lmesh,i Allsel,all *enddo /eshape,1 Eplot Dk,1,ux Dk,1,uy Dk,1,uz Dk,1,rotx Dk,11,uy Dk,11,uz sfbeam,all,1,pres,100 /SOLU Solve Finish /POST1 ETABLE,MI,SMISC,6 ETABLE,MJ,SMISC,12 Plls,MI,MJ,1,0
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