Is it possible to use a beam section with an offset to model a shell stiffener?
I don't seem to be getting a match for the rotational mode.
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Yes, the test below shows the rotational mode of the combined section is accurately captured compared to an all shell model. Note that the BEAM188 warping dof has to be turned on for this torsional mode (keyopt(1)=1.) You must specify outres,all,1 to see the 3D image of the deformed beam element. /prep7 rect,,20,,5 esize,1 et,1,63 r,1,.25 mp,ex,1,1e7 mp,nuxy,1,.3 mp,dens,1,.00025 amesh,1 et,11,188,1 sectype,11,beam,T secdata,6.25,6,0.5,0.5 secoff,user,,6.00 type,11 secnum,11 lsel,s,loc,x,20 lmesh,all alls nsel,s,loc,x,0 d,all,all nsel,s,loc,x,20 nsel,r,loc,z,0 d,all,uz,0 nsel,all /solu antype,modal modop,lanb,10 mxpand,10,,,yes outres,all,1 solve fini save,beam,db /prep7 lclear,all r,2,0.5 wpoff,20 wprot,,,90 rect,,6,,5 wpoff,6 wprot,,,-90 rect,,3,,5 rect,-3,,,5 nummrg,kp type,1 mat,1 real,2 amesh,all fini save,shell,db /solu solve fini |
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