Dear Researchers Greetings,
I'm trying to model a structure under earthquake loadings, I want to investigate the structure's non-linear behavior.
I went through a lot of papers in the literature. Besides those who rely on finite element method and modeling software (i.e., SAP2000, ETABS, Openssen ...). A few papers use the lumped mass system to represent structural models and introduce a hysteretic restoring force that reflects the inelastic behavior of the structure. This force is calculated based on the hysteretic behavior model presented by Bouc and Wen.
My question is, How accurate are the models based on this approach? If there exists an alternative to this approach please let me know.
Warmest regards.
Dear Mahdi,
You can use ANSYS software and after modelling the structure you can apply the loads. By applying the load as “Remote Displacement”.
To Create a load-displacement curve, there are two variables (load and displacement) in this case if you give the software the displacement, it will give you the loads. Because when you do the contrary, it gives false results.
Best regards.
Almoutaz Bellah Alsamawi
Dear Almouatz Bellah,
Thank you for your answer. I am more into lumped mass systems. My question is mainly related to the accuracy of the Bou-Wen model or the existence of a more accurate model for non-linear behavior.
Thanks again.
Regards.
Dear Mahdi Abdeddaim
In SAP, there is non-linear analysis. To investigate the EQs you can use the Non-Linear Time History (NLTH) analysis also. Regarding the hysteresis curves also you can define them by SAP for your elements. And you can check it for your system after analyzing it.
Kindly check these links:
https://www.youtube.com/watch?v=zT-mMmjdrtc
https://www.youtube.com/watch?v=ufbFG9e4yjU
https://www.youtube.com/watch?v=LgaK_v1ZL6E
Dear Masoum Mohammadi Gharagoz,
Thank you for taking the time to answer my question. I'm only interested in coding the non-linear behavior using the lumped mass system in MATLAB or PYTHON.
This choice is mainly motivated by the willingness to introduce a semi-active or active device afterward, which can't be modeled using SAP2000 or ETABS.
Regards.
Dear Mahdi,
Greetings.
Bouc-Wen is usually being used to model base-isolated systems. The model has been employed for so long, indicating its high accuracy in predicting the nonlinear behavior of such systems. However, the issue is that such a model requires solving differential equations (numerically) to estimate the modeling parameters, which sometimes requires rigorous efforts.
There is an alternative to that material. The algebraic material existing in OpenSees (https://opensees.github.io/OpenSeesDocumentation/user/manual/material/uniaxialMaterials/HystereticPoly.html) is a new type of material that brilliantly overcome such a shortcoming and matches to existing experimental tests.
The related resources are:
1- Chapter Thermodynamic Compatibility of the HystereticPoly Uniaxial M...
2-Article Nonlinear Dynamic Analysis of Seismically Base-Isolated Stru...
There is also a MATLAB program (ParIde) developed by the authors that can help you estimate the modeling parameters. The model is numerically accurate since I have tested it against multiple loading protocols.
BR.
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