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Hi Silvia I am running an eigen value analysis for a 4 story RC frame building using 3D fiber model. Each floor is defined as rigid diaphragm. The total no of dofs is 12. But I got the eigen vectors up to 6 modes. When I asked for more eigen vectors, the program gives the following msg. In my D: dri...

Hi Silvia during time history analysis, I can print the eigenvalues and eigenvectors at each step. My question what is the type of stiffness matrix used for the calculation of eigenvalues. is it the instantaneous tangent stiffness matrix or the secant stiffness at that step. could you please clarify...

Hi Silvia

is it possible to post the last Openees workshop documents?
It will be a great help..

thanks
gopal

Thanks frank

Dear Silvia

Is it possible to analyze a structure under dynamic loading, such as wind?

I want to give a time history loading at the top of the structure instead of at the base and analyze it dynamically considering damping. In manual, I saw that kind of loading can only be solved statically.

thanks silvia.
could please send any script to integrate curvature over plastic hinge and how to estimate the elastic component.

It will be helpful if you kindly send the syntax for plastic rotation recorder.

my email : adhikarig@gmail.com

thanks once again

gopal

Dear Silvia

Is there any option to calculate the plastic rotation at member end?
I am using nonlinear beam column element

thanks in advance

gopal

Hi Silvia these are the scripts I used. ------ ------ Section Analysis ---- # SET UP ---------------------------------------------------------------------------- wipe; # clear memory of all past model definitions model BasicBuilder -ndm 3 -ndf 6; # Define the model builder, ndm=#dimension, ndf=#dofs...

axial load is same in either case. its 60MN. i checked at the base reaction as an additional check

Hi Silvia I have again some problem with opensees. i did a moment curvature analysis of a rectangular hollow RC section using zero length section element as given in your example files. the results are matching perfectly with the USC_RC software( another free software for section analysis). so my sc...

Thanks pejman..

its a hollow rectangular section modeled in 3D

Hi Silvia I just tried that. because my piers are quite massive. anyway i can use nodal load. I have another problem regarding zero length section element. when I try to add zerolength section element for strain penetration, it shows some problem. i just paste the relevant part. node 1 is the suppor...

Hi Silvia i am trying to model a bridge. Pier columns are defined as nonlinear force based beam column element. when i use element load option to input gravity load, results sometimes do not converge and when converge, it gives almost zero reaction at base. it seems nonlinear beam column element do ...

Dear Silvia presently i am modeling tall piers for long span bridges. i used force based nonlinear beam column elements for piers along with corotational transformation. can i use them together to get both material inelasticity and geometric non-linearity? i read in some recent papers (Neuenhofer 19...