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fmk wrote: > it is exactly same as 2d! Yes , the entire code is same as 2d. But main problem, how to get time periods in a specified direction. I need time period in x and z direction. And also the eigen vectors am not obtaining correctly. I will briefly describe my code here. Am assigning rigid dia...

Hi all, Can anyone explain me how to perform eigen analysis of a 3D frame? I had done the eigen analysis of 2D frame and it had run successfully. Mainly I need to find out mass participation factor from the obtained eigen vectors. Am not understanding how to obtain correct eigen vectors? Can anyone ...

fmk wrote: > the rigid diaphragm does not add any additional bending stiffness at the > nodes .. the shell does .. a more comparable element in terms of the > stiffness, or more correctly lack there of provided viz-a-vie these > stiffness components, is a quad element. Hi fmk, As you said, If one us...

tguha wrote: > Thank you for the response. So for shell elements in the model (that I am > using to model a thin plate structure), I can assign the density of the > plate fiber section without having to assign nodal masses of the four > corner nodes making up the shell element. And for elastic beam-...

fmk wrote: > the rigid diaphragm does not add any additional bending stiffness at the > nodes .. the shell does .. a more comparable element in terms of the > stiffness, or more correctly lack there of provided viz-a-vie these > stiffness components, is a quad element. HI, I am working RC 3D buildin...

Hi,
are you bale to solve the problem? am also facing some problem in the eigen analysis of 3D frame.
Am not able match the Time period values of Opensees and SAP? Can you please help me here

selimgunay wrote: > Yoiu can use some other material (for example Hysteretic) to define the > shear force-displacement with a negative slope after the yield. Hi, I have the yield shear displacement values as ; shear=84KN and corresponding displacement as 0.5mm. After reaching the yield shear value, ...

selimgunay wrote: > You need to define the force displacement relation in shear. Note that you > need to do this using uniaxial material command. Then you need to combine > your flexural fiber section with the shear force displacement using section > aggregator. I had used uniaxial steel01 material ...

aylsworth wrote: > No need for section aggregator if you just used zerolength element to > assign the shear springs > > You can use both. This might help you. > > http://opensees.berkeley.edu/wiki/images/5/57/LimitStateMaterialManual.pdf Thank you for your reply. I had already gone through this manu...

aylsworth wrote: > You can use this document for that > > http://opensees.berkeley.edu/wiki/index.php/File:ElwoodCJCE2004.pdf Thank you After using these below commands, do I have to still use the section Aggregator? node 1 0.0 0.0 node 2 0.0 $LColumn node 74 0.0 $LColumn element forceBeamColumn 111...

aylsworth wrote: > selimgunay wrote: > > I don't think you need to use the section aggregator as there is no section > > used in the zerolength element. That may be the source of the problem. > > Ah yes. Sorry I forgot to mention that my element is beamwithhinge then the axial > spring is integrated...

fmk wrote: > yes Hi, thanks for your reply. Is there any way to model shear hinge i.e., shear capacity failure criteria in opensees. By section aggregator one can aggregate the shear with fiber section. But before aggregating how to define the shear capacity of the column so that the column after re...

HI, I need to define the shear strength capacity of column which I have to model as brittle failure. when performing pushover analysis Once the RC frame reaches the yield value, it should fail in shear. So after that I can use section aggregator and define the shear axial and flexural interaction pr...

selimgunay wrote:
> Please indicate your contact email. I will send it to interested people
> soon.

Can you please send me the shear-axial interaction source code?
My email: palagalavenkatesh@gmail.com

selimgunay wrote: > It does not consider shear. You need to define the shear force displacement > separately and use section aggregator to combine shear and flexure > > http://opensees.berkeley.edu/wiki/index.php/Section_Aggregator HI selimgunay, I am forceBEamColumn element fiber section for defini...