properties of finite dement soltions Noded point equilibrio +0 At a node, the sow of he elemeat nodal forces s in equilibriun with Hhe externed loads Follows directLy froM KU=R
② B80= 2BClE3 dv Z R E(B(g dv,Z Re e F Element eovilibriuw Exd element is in eguilibrium under its forces F cg MoTIons
(3 PVD fr elemet "e" under a rig id-boody virhood displace 88=O Since Sul is a rigid-body but otherwise arbitrary virid displace ewt field, tis'twblies the frees ene in equilibriUM 工 nterpretation of fin ncte element analsis Continuo (structure) idleelieed as aeseunbly of discrete elements connected st modes Externed forces are reduced to equivalet extemal node forces usinQ PVD