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Hello I have an Important question about concentrated plastic hinge parameters setting: In model with concentrated plastic hinge, the stiffness of spring modify by a "n" parameter (multiply by n) SO the rotation of the hinge decrees n times. When I plot moment-rotation response of a hinge the yield ...

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how can I make a pre-tensioned bar element that is fixed in ends

Hello I made a portal frame with elastic beam column element and concentrated plastic hinges at the ends of elements. then I analysed it with and without "equaldof" for tow nodes on the roof under earthquake record. when I use "equalDOF", period of the structure is about 0.6 sec and without it the p...

Hello I make a portal frame with concentrate plastic hinge and also I use a rotational fraction damper in it. when I run the model for eigen Analysis follow comments appear : Modified Ibarra-Medina-Krawinkler Model with Bilinear Hysteretic Response ProfileSPDLinDirectSolver::solve() - aii < minDiagT...

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Can I use Mr. Lignos's suggested formulas for other than RBS beams to adjust the columns plastic hinges? or there is another formulation for columns?

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Based on example in your website about MRF with panelzone and description about uniaxialMaterial Bilin there is contradiction. in example is expressed for no deterioration Lambda must be a large number but in command manual section is expressed they must be zero...!
which one is correct؟

Hello to all I want to analyse a moment frame for design it by non linear time history analysis method. I model a leaning column also. witch gravity load combination should be used for applying in beams and leaning column? I confused by standards. For nonlinear seismic analyses, ASCE 7 specifies a g...

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Do we need modify Lambda parameter by equation (lambda*(n+1)) for concentrated plastic hinge frame?

Hello
How I can calculate appropriate value of Lambda_S,Lambda_C,Lambda_A, Lambda_K for Modified Ibarra Krawinkler material (for AISC W Section)?

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Is there any way to record maximum forces (p v m) in the elastic beam column element.??

Hi I Want to use rotational springs for plastic hinges with bilin material based on Ibarra-Krawinkler model. for modifying stiffness of springs in the Ibarra& Krawinkler report (2005) bellow equation is provided. 1/Kmem=(1/Ks) + (1/Kbc) & Ks=n*Kbc ------> Ks=(n+1)*Kmem so my question is: is "Ks" sti...

I use the model of 1 bay 2 story concentric moment frame in your website that written by "Laura Eads, Stanford University, 2010" for learning. in its attached word file is written that the period of the first and second mode is 0.81 and 0.18 respectively but when I run the file in opensees i see the...

is there any effect of leaning column on period of structure?
in my model, period is different with and without leaning column. is it normal?

is there any effect of p-delta column (leaning column) on stiffness of a frame?
In my model, period of frame is different with and without p-delta column. is it normal?

Hi
in my model there is p-delta column and if "P" be total Load "(Dl+LL)*$WBuilding" on each Roof so my question is:
what is the load that must be applied to leaning column at each floor?
please explain