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And another question.I know this(https://portwooddigital.com/2021/09/12/failure-to-solve/)explain (ProfileSPDLinDirectSolver::solve() - aii < 0 (i, aii): (3, 0)......return-3 eooro flag) but if my script can run the modal analysis,and it can give period,it still give three lines of this(ProfileSPDLi...

I adjust my model,and a new problen occured.opensees says"WARNING no -dirn flag encountered - element ZeroLength eleTag? iNode? jNode? -mat matID1? ... -dir dirMat1? .. <-orient x1? x2? x3? y1? y2? y3?>" I dont know where is wrong,What does -dirn mean?I searched it and seems noone has met ...

The -orient option is for specifying the local x and y axes https://opensees.berkeley.edu/wiki/index.php/ZeroLength_Element Sir,I specify local x and y axes,and now i ran into a new problem.The opensees says :"WARNING no -dirn flag encountered - element ZeroLength eleTag? iNode? jNode? -mat ma...

sir i think i have a problem in understanding this element.what will happen if i put this into script,does this(-orient -0.640 0.000 0.768) mean the local ocal z-axis?will this two elements rotate about local z aixs? element twoNodeLink 2 2 4 -mat 8 -dir 6 -orient -0.640 0.000 0.768 element zeroLeng...

its a CFS frame in opensees 2.5.0 wipe puts "System" model basic -ndm 2 -ndf 3 puts "restraint" node 1 0.000E+000 3.000E+003 node 2 0.000E+000 0.000E+000 node 3 3.000E+003 3.000E+003 node 4 3.000E+003 0.000E+000 node 5 0.000E+000 0.000E+000 node 6 0.000E+000 3.000E+003 node 7 0.0...