×
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!
  • Students Click Here

*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

Jobs

Steel I-BEAM Equivalent to a 2"by 10" hardwood joist

Steel I-BEAM Equivalent to a 2"by 10" hardwood joist

Steel I-BEAM Equivalent to a 2"by 10" hardwood joist

(OP)
I have a fractured floor joist under my dining room
floor that I want to replace with steel.

The span is 14'-6". What size of commercially available
steel I-Beam should I use?? I'd like to keep the web height
to anything less than 8" and flange width to 2-3"......but the most common type available that will be equal in strength to the wood with a 25% safety factor is all I really need.

RE: Steel I-BEAM Equivalent to a 2"by 10" hardwood joist

Assuming the joist is fractured as you described it can likely be repaired in place which would be lot easier than removal and replacement.  If you want to repair it in place, consider using a piece of 6-inch wide steel flat bar, 3/16 of an inch thick, for the full span.  Drill a 5/16-inch diameter hole, 1-inch of the edge of the plate every 6 inches, top and bottom, staggering the holes by 3 inches from the top and bottom (start the top holes at 3 inches from the end, then drill one hole every 6 inches, and start the bottom holes at 6 inches from the end, then every 6 inches).

Jack the joist back into place and put the plate on one side of the joist with the bottom edge of the plate flush with the bottom of the joist.  Clamp everything in place and drill corresponding 5/16-inch holes in the wood joist, inserting a 5/16-inch corrosion resistant bolt in each hole as drilled.  You will likely need to hammer the bolt through, but this is intentional as you need the fit to be tight.  Place the head of the bolt through the plate side and place a 5/16-inch fender washer on the wood side followed by a lock washer and nut.  Tighten the bolts until the wood fiber starts to compress.

This process is called flitching or flitch-plating the joist.

If the joist is beyond repair, replace it with another wood section.  The steel as a retrofit will be difficult.

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


Resources

White Paper - The Evolving Landscape of Commercial Battery-Powered Trucks
What’s driving the evolving landscape of truck electrification? What are the barriers, motivators and strategies for accelerating the electric transition? What insights and resources are available for today’s design engineers working to achieve industry disruption and evolution? For answers to these and other pertinent questions, read this white paper. Download Now
eBook - Rethink Your PLM
A lot has changed since the 90s. You don't surf the Web using dial-up anymore, so why are you still using a legacy PLM solution that's blocking your ability to innovate? To develop and launch products today, you need a flexible, cloud-based PLM, not a solution that's stuck in the past. 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