nmiller2012
Structural
- Apr 27, 2016
- 1
Hi all,
Myself and a few of my colleagues are attempting to extrapolate a 2D benchmark model (of a 3-story building) being used for earthquake analysis with a 3D equivalent model. My team originally created the model using the traditional ANSYS GUI interface, but experienced several issues in the design of the connections and has since decided to start from the ground up with the ANSYS Workbench interface.
Due to the fact that CAD connection details are not directly available (only the connection action is specified, ie pin-pin, fixed-pin, etc), we are modeling the beams and columns of the structure as line elements and the slabs in the first/second floors and roof as surface elements. Our issue is arising in the Mechanical interface, again with the connections. After much trial and error with the various joints, I have been able to successfully create joint action between some of the beams and columns. However, I cannot develop proper joint action in terms of transfer of shear and moment between the members.
The only way that I have been able to avoid mesh errors is to create joints between members and points in the model using body-body connections. But, for example, if I create several fixed columns and then use body-body joints with fixed translations but free rotations (which I assume should mimic pin connections), I am still getting moment transfer from the beams to the columns. Similarly, fixed body-body connections do not transfer moment in the manner they should (positive moments at centers and negative moments at column edges) I need to be able to idealize the system so that proper action is achieved, so any help on that front would be much appreciated.
Myself and a few of my colleagues are attempting to extrapolate a 2D benchmark model (of a 3-story building) being used for earthquake analysis with a 3D equivalent model. My team originally created the model using the traditional ANSYS GUI interface, but experienced several issues in the design of the connections and has since decided to start from the ground up with the ANSYS Workbench interface.
Due to the fact that CAD connection details are not directly available (only the connection action is specified, ie pin-pin, fixed-pin, etc), we are modeling the beams and columns of the structure as line elements and the slabs in the first/second floors and roof as surface elements. Our issue is arising in the Mechanical interface, again with the connections. After much trial and error with the various joints, I have been able to successfully create joint action between some of the beams and columns. However, I cannot develop proper joint action in terms of transfer of shear and moment between the members.
The only way that I have been able to avoid mesh errors is to create joints between members and points in the model using body-body connections. But, for example, if I create several fixed columns and then use body-body joints with fixed translations but free rotations (which I assume should mimic pin connections), I am still getting moment transfer from the beams to the columns. Similarly, fixed body-body connections do not transfer moment in the manner they should (positive moments at centers and negative moments at column edges) I need to be able to idealize the system so that proper action is achieved, so any help on that front would be much appreciated.