ETABS - inclined support 2

[honzav]

I have Etabs 20.0 and can't figure out how to model inclined support (roller restraint). There was In SAP200 option to define local axis for restraints/supports.

Thank you for your help in advance.

Honza

 

[Krishna7568]

what is your inclination angle? If it is 90degree then simple restraint that point/position in translation (x,z) or (y,z), depending on your case of roller.

 

[CSIESPL INDIA]

I have Etabs 20.0 and can't figure out how to model inclined support (roller restraint). There was In SAP200 option to define local axis for restraints/supports.

Thank you for your help in advance.

Honza

1.Start by opening your existing ETABS model or create a new one.
2.Go to the “Define” menu at the top of the interface and select “Supports.” This opens the support definition dialog box.
3.Click on “Add New Support” to create a new support type.
4. In the support type options, choose “Roller” as this will allow for movement in one direction while restraining movement in another.
5.While ETABS does not have a direct option like SAP2000 for local axes in supports, you can define the inclination by manipulating the global axes.
6. If necessary, rotate your model or use transformation tools within ETABS to align your structure accordingly.
7. To effectively simulate an inclined roller support, ensure that you are placing your supports at joints where you can control their orientation based on joint coordinates.
8. You may need to adjust joint orientations manually if they do not align with your intended support direction.
9. Choose the beams or columns where you want to apply this inclined roller restraint from the list.
10. After assigning supports, run a quick check of your model for any errors or warnings related to constraints
11. Once satisfied with your setup, proceed with running analyses (static or dynamic) as required for your project.
12. If you require more complex behavior than what is achievable through simple roller restraints (e.g., specific directional constraints), consider using spring elements or custom constraints
13. Always refer back to ETABS documentation for updates or additional features that may assist in modeling complex supports.

 

[Luceid]

I think the above recommendation is a bit overkill - I do believe that in other CSI software you can rotate the local axes of a joint using assign->joint->local axes. Rotate one of the axes to the angle you want - and then provide a roller in that direction. I'm not 100% certain that this is included in ETABS, but I would be surprised

 

[sticksandtriangles]

I would recommend making a link and then rotating the link's local axis. That's the same process I followed in this post.

Batter Pile Foundations Example - Resolving lateral demands into pile reactions - Structural engineering general discussion

I am working on a building which must utilize batter piles to resist lateral loading as the upper soil strata are too weak to provide meaningful lateral resistance. I have found limited information regarding battered piles, especially worked out examples from a structural engineering...

www.eng-tips.com

The link can have the same properties as the restraint tab if you fix the corresponding direction.