Hello friends,
I have a question regarding structural engineering.
I modeled a reinforced concrete column in OpenSees (with displacement-based element), performed gravity analysis, and conducted modal analysis. (Nodal masses were exported from SAP2000 to OpenSees model, and six sub-elements were considered for meshing).
To validate the results of analysis and obtained natural period, I created a model with the same geometry, material properties, and section in SAP2000 but obtained different results. Based on my investigations:
What do you think is the key to having an accurate model in both OpenSees and SAP2000, considering all factors, so that the obtained periods are the same for both models?
final purpose is to develop a realistic model of reinforced concrete column in Opensees for linear and nonlinear analysis considering all key factors (longitudinal and transvers rebars, shear modulus of concrete, interaction between axial and flexural forces, P-Delta effects and so on.
Thanks a lot in advance
Concerning the periods, you must check that the mass and stiffness in SAP2000 and Opensees are equivalent. For the nonlinear analysis, you can expect different responses since the models used in sap2000 are different from those of opensees.
Hey Pooria!
I read you would like to consider P-Delta effects but did not understand if you already use geometric nonlinearity in OpenSees. If you would like to compare two different software, I suggest starting with a fully linear analysis. If they match, then you can add nonlinearity step-by-step and see what happens. Your 3rd bullet point made me think it might be worth a shot to double-check if all the nonlinearities (especially P-Delta or Corotational transformations) turned off.
Good luck,
Deniz
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