Design of Expansion & Fixed Bearing Supports 1

[oengineer]

I am seeking design information (i.e. technical design guides, design example calculations, etc.) for the design of Expansion & Fixed Bearing Supports (see image) based on AREMA criteria.

Suggestions/comments are appreciated.

 

[oengineer]

Information regarding the design of Expansion & Fixed Bearing Supports using AASHTO criteria is helpful as well.

 

[Guest090822]

High Rocker bearings like those pictured are no longer being used in the USA. You have a lot of research to do!

 

[oengineer]

High Rocker bearings like those pictured are no longer being used in the USA. You have a lot of research to do!

Here is another image showing the type of Expansion & Fixed Bearing Supports that I am seeking design information on:

From what I am seeing online initially, it appears that these types of supports are still in use.

Are you aware of any technical design documents for these types of supports?

 

[Guest090822]

These are still in use, but when it comes time to replace them a newer bearing is used.

 

[oengineer]

These are still in use, but when it comes time to replace them a newer bearing is used.

Would happen to know of any design example calculations and/or technical design guides to design these supports? Do you happen to have suggestions on the best method to carry out the design of these supports, using AREMA and AASHTO?

 

[JedClampett]

TheRick109; just curious. What do they use for bridge bearings now?

 

[bridgebuster]

Jed - for highway bridges, elastomeric bearings are typically used. For highway bridges with high skews >30 degrees, multi-rotational or disc bearings are preferred.

We recently worked on a design-build tender for a railroad bridge project. The bearings shown in the indicative plans were high rockers. The owner was willing to consider our proposal to use disc bearings. Moot point though, we didn’t win.

 

[bridgebuster]

oengineer - I’ll look through my files. Somewhere I have some text book examples.

 

[oengineer]

oengineer - I’ll look through my files. Somewhere I have some text book examples.

Thank you, bridgebuster

 

[bridgebuster]

Here's something from an text book. About halfway through, you'll find rocker bearings.

 

[bridgebuster]

here's something from a text book for design of a truss pin bearing

If you go to Google Books, you can download "Bridge Engineering Vols.1 & 2", 1916 by JAL Waddell. In Volume 1 he has a discussion on designing bearins aka shoes.

 

[oengineer]

here's something from a text book for design of a truss pin bearing

Thank you, bridgebuster, for the information!

For some reason I am unable to access the link you uploaded regarding the "design of a truss pin bearing". The info is not appearing when I click on the link.

 

[oengineer]

Here's something from an text book. About halfway through, you'll find rocker bearings.

The info contained in this document is very helpful! Thank you!

 

[oengineer]

@bridgebuster

I would take it that the AREA specification mentioned in the document text book document is actual the AREMA code, correct?

 

[bridgebuster]

@oengineer - I'm glad you found the info helpful. I uploaded the truss pin bearing again.

Yes, you are correct: AREA is now AREMA.

 

[oengineer]

@oengineer - I'm glad you found the info helpful. I uploaded the truss pin bearing again.

Yes, it is very helpful! Thank you!

However, I am still unable to access the link that you attached for the "Pin Bearing" info. When I click the link, nothing comes up.

Yes, you are correct: AREA is now AREMA.

Thanks for the confirmation!

 

[oengineer]

I uploaded the truss pin bearing again.

I have uploaded an example of a pinned connection design for a truss (see link):

https://files.engineering.com/getfi...55d3e9152bc&file=Pinned_Connection_Design.pdf

@bridgebuster - Is the example in the Link similar to what you intended on providing?

 

[bridgebuster]

@oengineer, your file is similar to what is described in the file tried to post. The one I posted didn't have an example though. Let's see if it worked this time.

3rd time wasn't a charm.

 

[oengineer]

@oengineer, your file is similar to what is described in the file tried to post. The one I posted didn't have an example though. Let's see if it worked this time.

Thank you for letting me know!

3rd time wasn't a charm. sad

It's okay, thank you for trying a 3rd time!