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help................

when i use constraints Penalty some of my nodes don't have any displacement
why?

what we should do about convergence problem for plate that use as flexible diaphragm ?

hi
i have 9 story building
in my MPA analysis my capacity curve for first mode is ok . but for second mode my capacity curve has large steps (these steps are related to base shear changing)
what should i do?

what i should do if i want to record displacement for special coordinate on plate (i don't have node on that coordinate)?

if i want everything 3d. i should use from "ElasticMembranePlateSection" element that its thickness is the thickness of floor and its node should constraint by my plane node is it right? . because i use this method but the period of my structure has a lot of error when i compare it by ETAB...

in this post: http://opensees.berkeley.edu/community/ ... ent#p49187
vesna said Quad element can be only used in 2D and it has 2 dofs per node. my model is 3D

i want to use from your quad elements suggestion but i don't know you about "2 modelbuilders required and equalDOF between the 2 sets of nodes" may explain more about it what dof should use in equalDOF command? may model is like: http://opensees.berkeley.edu/wiki/images/d/dd/Ex8.genericFra...

hi
dear fmk
how i can introduce semi rigid diaphragm for 3D model?

dear fmk
I try all type of element for Beam, Brace and column
but my problem don't solve
after using penalty get compatible error is in many beam, brace and column

failing is related to the columns. what i should do?
if i want use from penalty , how i can determine alpha coefficient.

hi my 3d model is 3 stories, 6 bays in x direction, 4 bays in y direction and have chevron brace in 3 bays in 2 direction when i introduce rigid diaphragm (like :http://opensees.berkeley.edu/wiki/images/d/dd/Ex8.genericFrame3D.build.Wsec.tcl) my model has this error in timehistory analysis: WARNING ...

hi for bottom script i don't have result,why? wipe model basic -ndm 2 -ndf 3 node 1 0. 0. node 2 2. 0. node 3 0. 1. node 4 2. 1. node 5 0. 2. node 6 2. 2. fix 1 1 1 1 fix 2 1 1 1 mass 3 2000.0 0. 0. mass 4 2000.0 0. 0. mass 5 2000.0 0. 0. mass 6 2000.0 0. 0. geomTransf Linear 1 set A 1 set E 1 set I...

hi
for example http://opensees.berkeley.edu/wiki/index ... 6_Analyses
how i can determine the load F2 & F3 , F4 for other mode?

hi in example 7 ( http://opensees.berkeley.edu/wiki/index.php/OpenSees_Example_7._3D_Frame,_3-story_3-bayX_3-bayZ,_Reinforced-Concrete_Section_%26_Steel_W-Section#Steel_W_Section) in file " Ex7.Frame3D.build.Wsec " introduce "Ubig" as magnitude of torsional stiffness , but i don'...