The modeling of reinforced concrete plane frame is developed in OpenSees for collapse analysis. Elastic beam column element for beam and columns and the Join2D element for the RC beam-column joint are used using lumped-plasticity approach (Liel, A. B and Deirelein, G. G 2008). I have some issues for selecting material models and appropriate modeling parameters required for Joint2D element. When Modified Ibarra-Medina-Krawinkler Deterioration Model with Bilinear Hysteretic Response (Bilin Material developed by Ibarra, Medina, and Krawinkler 2005) is used to model joint2D elements developed by Altoontash 2004, I got unusual results.
http://opensees.berkeley.edu/wiki/index.php/Modified_Ibarra-Medina-Krawinkler_Deterioration_Model_with_Bilinear_Hysteretic_Response_%28Bilin_Material%29
Next, the modeling parameters for the bilinear materials for RC elements created based on the equations given in PEER Report 2007/08 titled with Assessing Seismic Collapse Safety of Modern Reinforced Concrete Moment-Frame Buildings by Curt B. Haselton, Gregory G. Deirelein. When I used these equations and used for bilinear material, I am unable to get the desired results for both pushover analysis and moment curvature response. Either I am using wrong material models, in appropriate parameters, or missing something in my model.
Please advice me how I can model RC beam column joint using Joint2D element using with Ibarra, Medina, and Krawinkler (2005) material model or by other material models. Please advice me selecting appropriate material parameters that can provide reasonable response.
Firstly, I usually adopt the pinching4 material to simulate the shear panel, this shows good computational stability. Secondly, according to my own experience, the BeamColumnJoint element may show less reliability but strong stability. I have written a paper on this and will send to you when it is available.
Dear Linlin Xie,
Thank you for your response for selecting appropriate material model for the shear panel. Do you have test one simple one story model for validation? If so please explain more about modeling and response behavior. When I tested one story frame, I got reasonable response of base shear (0.20V/W) up to first yield or crack point., but I got very high base shear response (1.0-1.2V/W) beyond that point. Next, I am unable to get response after reaching peak response.Next, the time period is very high if I used joint2d element. You can write email at [email protected] to discuss more.
As far as i can see, there are some followers of this discussion (including me, also) so, if you don't mind, keep the conversation shared.
Dear Anastasios,
I am glad to share what has been in our discussion. However, I wrote some emails response to some followers, but I did not get back response from them about the issue. It would be glad to have more discussion and wide opinion to get more reliable results from different researchers.
In my one simple model of one story frame, I model shear panel using joint2d element with five uniaxial material model, and then I employed external bilinear material model for the spring at the end of each beam and column to model beam and column based on the lumped plasticity model.
Prof. Lu, my supervisor, has conducted a seires of experiments and shared the experimental data on the following website: http://www.luxinzheng.net/endownload.htm. In addition, we have invited numerous researchers to simulate the RC joints and some of them also shared the models on the following website: http://www.collapse-prevention.net/download/Updated_Joint_Model_2012-02-16.rar. I think you can get something from these. My associated paper has been accepted by journal of earthquake engineering, when it is available online, I'll send you as soon as possible.
Dear Linlin,
Thank you very much for your two valuable links, but the second link is not accessible. Do you develop simple one story frame with joint2d element? if so, could you provide me some thoughts how you select material type and how you model the elements? Or are you getting some results for RC frame with joint2d element? I am not getting results using joint2d.
The paper “Experimental Study and Numerical Model Calibration for Earthquake-induced Collapse of RC Frames with Emphasis on Key Columns, Joints and Overall Structure” can be downloaded from researchgate and the following website:
http://www.tandfonline.com/doi/full/10.1080/13632469.2015.1040897#abstract
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