I have a pressing issue with my thesis, as I need to analyze numerous 3D moment frames, but I'm running short on time. Moreover, the buildings I'm studying are symmetrical and lack torsion or disarray complexities. I wonder if it's possible to model 2D frames with properties equivalent to those of the 3D frames, and still achieve accurate results. This would significantly save me time. I'm seeking assistance on how to perform this task in ETABS. Can anyone help me with this?
The plane strain model as 2D model equivalent to 3D model is applied when we analyze the longitudinal uniform structure (e.g. the tunnel) by Finite Element Method.
Limiting the frames, on the longitudinal uniform structure we can analyze the cross-sectional bending moment, axial force and shearing force inputting the pitch properties of cross-sectional members. And we can analyze the longitudinal bending moment, axial force and shearing force using the properties of the longitudinal members.
It is very possible. I'd advise you use AutoCAD for the 2D. You can convert the 2D frame to 3D in AutoCAD, and ANSYS would be perfect for your analyses.
I don't know much about ETABS.
The first is to create a 3D model, from the statics results obtained are entered into the 2D model. The results are in the form of moments, shear and torque.
Yes, it is possible to model 2D frames with properties equivalent to those of 3D frames and still achieve accurate results, especially if the buildings you are studying are symmetrical and lack torsion or disarray complexities. This approach can save you a significant amount of time. To perform this task in ETABS, you can follow these steps: 1. Open your ETABS software and create a new model. 2. Define the properties of the materials you will be using in your analysis, such as concrete or steel. 3. Create the 2D frame elements by drawing them on the plan view of your building. Make sure to accurately represent the geometry and connectivity of the 3D moment frames. 4. Assign appropriate section properties to each frame element based on the properties of the corresponding 3D moment frame members. 5. Apply loads to your model, such as dead loads, live loads, or any other relevant loads. 6. Define boundary conditions for your model, including supports and restraints. 7. Run the analysis in ETABS using appropriate analysis settings and methods (e.g., static or dynamic analysis). 8. Review and interpret the results obtained from the analysis, such as member forces, displacements, reactions, etc. It is important to note that while modeling 2D frames can save time, it may not capture all aspects of behavior compared to a full 3D analysis. Therefore, it is recommended to validate your results by comparing them with known benchmarks or conducting additional checks if necessary. If you need further assistance with specific steps or features in ETABS during this process, feel free to ask for more help.
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