Contact US

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.

Students Click Here

Verifying 1920 bridge steel type by hardness testing

Verifying 1920 bridge steel type by hardness testing

Verifying 1920 bridge steel type by hardness testing

We are trying to confirm the actual steel type and allowable stress for a 1921 historic truss bridge which some in our city are targeting to demolish and replace with a new concrete bridge. One Caltran calculation error has already been discovered which increased the bridge sufficient rating from 2 to 53.9. If the steel can be confirmed to be A7 carbon steel, the rating would be increased to 65 which is significant since the 20 foot width of the bridge lowers the rating by 19 points soley due to the width.

Tensile testing of coupons cut from the floor members has been suggested as a verification means. However, statistical modification of such data would require an unreasonable number of samples.

It has also been suggested that the less invasive method of hardness measurement could also confirm the steel type. Sufficient data could be taken to raise the statistical confidence.

Does anyone have any references or professional contacts who can advise on the feasibility, practicality and cost of such hardness testing? The bridge presently has a lead-based coating which is reasonably intact.

RE: Verifying 1920 bridge steel type by hardness testing

You might have more luck in the structural or bridge engineering forums.

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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