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hi
i have decided to modeling and calculating euler buckling load factor for column with one end restrained and other end free
how to write this code and how to record euler buckling load factor?
thank you

Dear Frank, I create code but dont work and more error model BasicBuilder -ndm 2 -ndf 3 file mkdir Kbrace foreach L {3.0 3.5 4.0 4.5 5.0 5.5 6.0} H {3.0 3.5 4.0 4.5 5.0} l {[expr 0.1*L] [expr 0.2*L] [expr 0.3*L] [expr 0.4*L] [expr 0.5*L]} h {[expr 0.1*H] [expr 0.2*H] [expr 0.3*H] [expr 0.4*H] [expr ...

thank you dear frank
bests for you

hi friend im modeling 2D one story one bay steel brace frame in opensees. L is length of beam H is Height of column L values are 3m,3.5m,4m,4.5m,5m,5.5m,6m H values are 2m,2.5m,3m,3.5m,4m,4.5m,5m section of beam,columns and brace are 10 sections with different values for each elements pushover load ...

hi i have 2D-2story model with 2 different damping (C) for each story- [C1 & C2] i assign C1 and C2 to each story with region command.(C=Zeta*2*m*w) i decided write active algorithm for change damping during analysis between C1 and C2. (LQR or PID algorithm) for example: when t=0.1s damping for ...

I want to apply 2 different damping ratio for my model by use region commmand. I wrote a code but it did'nt work correctly , please tell me my mistake? wipe model BasicBuilder -ndm 2 -ndf 3 file mkdir nonclasic set L [expr 5] set H [expr 5] node 1 0 0 node 2 $L 0 node 3 0 $H node 4 $L $H node 5 0 [e...

thank you frank

if nod4 disp > 0.01
assign C1=0.01 for region 1 (region1 -ele 1 2 3 4)
if node6 disp > 0.05
assign C2=0.2 for region 2 (region2 -ele 5 6)
if Drift1<0.005
assign Copt=0.1 for all

how to write and apply this algoritm to my opensees code?

Thank you frank i am decided to apply 3 damping ratio to model.(active control problem-TTSOONG).for specifiec time apply specified damping ratio to model. damping ratio are: Cmin,Copt,Cmax. in other words 3 damping ratio can switching together. for this purpose i apply some criteria to model for swi...

which region command suitable for my target? (for assign 2 different damping ratio to beams and columns in each story "story 1 and story2". mass assign to each joint and dont assign mass to elements )
region node or region element?

hi friends (first): I decided to modeling 2D , 2story frame with 2 different damping ratio (each story have a uniqe damping ratio) . i use region command in tcl but unfortunately dont work correct. i guess , i write uncorrect region command. (second): after modeling 2story frame with 2 different dam...

setare u must use this code


geomTransf Corotational 1 0 0 -1 ; #colmn
geomTransf Corotational 2 0 0 1 ; #in plane beam
geomTransf Corotational 3 1 0 0 ; #out plane beam

be successfull

i thank you for reply. i'm model friction damper according to what Dr. Imad H. Mualla used his papers. and i want to change this code as from friction damper to rotation friction damper.please help me to write this code. for represented friction damper i used element zeroLength frome node 14 to 13. ...

Dear Vesna please help me to correct this error, i'm so confuse to correct < corotCrdTrans3d: compute elemt length and orien: 0 length :( < force beam column 3d: set domain .. error initializing coordinate transformation > :( wipe; model BasicBuilder -ndm 3 -ndf 6; file mkdir payam; set dataDir paya...

dear vesna ; HELP ME PLEASE

dear vesna ; HELP ME PLEASE