INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Steel-Reinforced Elastomeric Bearings Stiffnesses and Damping

Steel-Reinforced Elastomeric Bearings Stiffnesses and Damping

(OP)
Hi!

I was tasked to identify the spring constant of the designed bearing pads in accordance with AASHTO LRFD 2012 Specification. My problem is, I cannot find any writing within AASHTO that demonstrate the calculation of these constants (stiffnesses). I was able to read the provision of Australian Code and they presented a direct formulation for these constants based from the geometry and property of the bearing pad, however, I am not sure if I can incorporate these provisions with the AASHTO designed bearing pad.

Also, I have read from another thread that someone used the "Design Guidance- Geotechnical Earthquake Engineering for Highways, Volume I - Design Principles" publication and used the equation for rectangular footing stiffnesses. The formula given can be easily understood, however, some parameters are using the characteristic of the soil which differs from the case of bearing pads.

Can anyone suggest an acceptable method to determine these constants as well as to know the damping capacity of bearing pads?

Thanks a lot.

RE: Steel-Reinforced Elastomeric Bearings Stiffnesses and Damping

Seismic Design of Bridges, Publication Nos. FHWA-SA-97-006 through FHWA-SA-97-012, is a seven-volume set of design examples of different bridge types. Each example is incomplete, in that they are intended to demonstrate different aspects of the full design. Things omitted in one example are often covered more in-depth in another example. In the past I've used Example No. 2 (FHWA-SA-97-007) to determine spring constants of steel-reinforced elastomeric bearings for use an a computer model. The publication is dated (I think it's based on the AASHTO Standard Specifications), but you may find some useful information if you can find those examples. Most of the time, the bearings don't know whether their stiffness is supposed to be LRFD, LFD, or ASD.

RE: Steel-Reinforced Elastomeric Bearings Stiffnesses and Damping

Let me know if you can't find the examples. I have a copy of them.

RE: Steel-Reinforced Elastomeric Bearings Stiffnesses and Damping

(OP)
Thanks crossframe for the information. I'm sure I will be able to learn alot from these references.

However, I am having difficulty finding these publications. It would be very helpful bridgebuster if I can have a copy of them.

Thanks in advance. :)

RE: Steel-Reinforced Elastomeric Bearings Stiffnesses and Damping

(OP)
Thanks you so much for these bridgebuster. Happy thanksgiving day! turkey2

RE: Steel-Reinforced Elastomeric Bearings Stiffnesses and Damping

You're welcome Uzil. Happy Thanksgiving to you.

RE: Steel-Reinforced Elastomeric Bearings Stiffnesses and Damping

(OP)
Nice. I have downloaded all the files. Thanks bridgebuster!

RE: Steel-Reinforced Elastomeric Bearings Stiffnesses and Damping

you're welcome

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources

eBook: Model-Based Definition (MBD)
As product development becomes increasingly complex and dynamic, it’s necessary for traditional engineering practices, processes, tools and mindsets to adapt and take advantage of new possibilities. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close