×
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

Statically Indeterminate?

Statically Indeterminate?

Statically Indeterminate?

(OP)
Hello all, I've got a beam design issue that I'm fighting with. I'll state the general scenario, then get to my question:

I've got a horizontal wide flange beam hanging (bolted) to (2) horizontal sqaure tubes that are 48" on center. The beam extends beyond one connection and has a point load about 36" from that connection.

My question: To me this looks like a statically indeterminate beam, I'm no expert however which is why I'm aksing. I see (3) unknown reactions here which are:

Ma (furthest most connection from the point load)
Ra y (vertical reaction furthest conn. from the point load)
Rb y (vertical reaction nearest conn. to the point load)

Am I on the right track with this, or have I misunderstood the reactions?

Thank you for your assistance.
  Jacob Dinardi

RE: Statically Indeterminate?

Sounds like a simple cantilever beam problem to me.

1) Sum your moments around Rbx (or Rby) to solve for Rby (or Rbx).
2) Now sum your vertical forces to get the other reaction.

If you dont know the value of the point load, at least you can get the percentages of the load at each reaction point.

Good Luck.......




Remember...
"If you don't use your head, your going to have to use your feet."

RE: Statically Indeterminate?

(OP)
Hmm... I had thought there would be another reaction other than Ray and Rby which would be Ma.

From your post it seems like you indicate there is not, which does seem reasonable now that I've thought about it, there is nothing keeping the end from rotating, and there is no horizontal load, so I guess that just leaves Ray and Rby, which I can deal with.

Thanks for helping me see the light!

Jacob

RE: Statically Indeterminate?

Don't forget the mass of the horizontal beam...

Chris Grace
Product Development Engineer
Sterilite Corp.

RE: Statically Indeterminate?

Sounds to me that the bottom flange of your beam is unsupported laterally, and it is in compression.  You may have a stability issue if you don't provide lateral support to your compression flange.

RE: Statically Indeterminate?

Is that beam rigidly supported at one end?

Seem like a simple Static question to me too.

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