Reaction force/moment of bushing joint of beam structures in RAS
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Hello, I have a beam structure with bushing joints to perform Response Spectrum Analysis. I wrote ADPL command per the post https://www.graspengineering.com/joint-reactions-in-response-spectrum-analysis-using-ansys-workbench/
I built a simple model to verify the method as shown in the figure. In the case
- All beams are modeled in massless material for simplification.
- A mass point is attached to the top structure
- The top 4 bushing joints are used to connect the column and top structure.
- Another 4 bushing points are modeled to connect the ground in terms of the 4 fixed beams.
What I want to get through the RSA
- To obtain the top 4 joints' reaction forces/ momentum.
- To obtain the total base shear force and overturning momentums
- To obtain the single-column reaction force/ momentum
Method
- ADPL is used to get the bushing joint reaction force/ momentum in RSA as no direct method in the workbench
- Fixed beams are used to connect the column to the ground to get the global base shear forces and over tuning momentums
The APDl works fine in static analysis. But the result is susceptible since the single vertical reaction force of the column (bushing joint by APDL) is BIGGER than the total reaction force obtained from the ANSYS.
Please advise. Thanks.
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