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Thanks for your reply When I puts "[eigen 1]" Returned value is 8.609374e+000 It is the same as SAP2000 value When I puts "[eigen 2]" Returned values are 8.609374e+000 1.082403e+001 they are the same as SAP2000 values but When I puts "[eigen 5]" Returned values are -5.8...

Hello everyone

I have modeled a 3D frame, which has been modeled in SAP2000, too.
the first and second eigen values are as equal as SAP2000. but other eigen values are negative. Why?

Thanks in advance,

Thanks for your reply.
In bi-direction analysis the masses should be assigned to X and Y direction?
Another question is about rotational inertia. Is it need to be considered?
How does OpenSees consider the mass in transient analysis?
Thanks.

Hi every body, I want to apply bidirectional ground motion to a portal 2D frame. are the masses assigned correct? # ^Y # | # 3____________________4 # | | # | | # | | # | | # | | # | | # | | # =1= =2= -------->X # # # calculated parameters set Weight [expr 2000.]; # beam weight set PCol [expr $Weight...

Thanks for your reply dear fmk. it was done. How can I record force in element which will be defined in each step of analysis, in this example when the element recorder was used the output file is contain 1 column and it is time and there isn't force columns, why? recorder Element -file Data/4.out -...

Thanks for your reply.
it was done.
How can I record force in truss element?
I have used element recorder before analysis but the output file has a column and that is time .

recorder Element -file Data/4.out -time -ele 4 force

Hello my friends. I have added a node in middle of a brace in an active braced frame and got this warning, why? Thanks. for {set i 1} {$i<6564} {incr i} { analyze 1 0.005 if {[expr abs([nodeDisp 4 1])]>0.06} { puts "[getTime] [nodeDisp 4 1]" remove node 5 node 5 1.5 1.5 element truss 4 1 5...

hello everybody
I have conducted IDA analysis in OpenSees, I wanted to scale my record base on SA(T1) is it true that I have used this factor ?
'' -factor [expr ($gmf*$g/$SaT)]''
gmf = 0.1 0.2 0.3 , ...
SaT : Spectral acceleration first mode period
thanks.

hello my friends I have used this recorder for curvature ''recorder Element -file IDAoutput.out -time -ele 1 section 1 deformation;'' The format of output for this recorder is : axial-strain curvature So why there is 4 column except time? My model is 3D output file: 0.02 0.000152875 2.8536e-020 -3.5...

hello my friends
I wanted to scale my record base on SA(T1) is it true that I have used this factor ?
'' -factor [expr ($gmf*$g/$SaT)]''
gmf = 0.1 0.2 0.3 , ...
SaT : Spectral acceleration first mode period
thanks in advance.