×
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

PLEASE HELP - Moment or Shear Connection ??
5

PLEASE HELP - Moment or Shear Connection ??

PLEASE HELP - Moment or Shear Connection ??

(OP)
Hi,

I have to design a five story steel frame for factory/storage. I have modelled it as a BRACED FRAME FROM ALL SIDE WITH ALL MOMENT CONNECTIONS, for the time being.

But i was wondering, as the frame is braced i could change the connections to pinned. OR Periphery Beams to column connection as moment and others as shear?

OR you would suggest something else?

PLEASE LOOK AT THE ATTACHED PICTURE






Thanks in advance,
Student structural engineer

RE: PLEASE HELP - Moment or Shear Connection ??

Quote (Homo Sapien)

Student structural engineer

So it is a uni/college project?

RE: PLEASE HELP - Moment or Shear Connection ??

(OP)
Hi,

No, I am interning at a small structural firm. They gave me this project to do.

RE: PLEASE HELP - Moment or Shear Connection ??

Real Project? if so ask around in the firms office. If no guidance, then said firm shouldn't be accepting such a project

Toby

RE: PLEASE HELP - Moment or Shear Connection ??

If it's a braced frame, then it's wasteful to specify moment connections. The braced frame portion will be significantly stiffer than any 5 storey moment frame.

RE: PLEASE HELP - Moment or Shear Connection ??

If braced with floor diaphragms, all joints can be pinned.

Dik

RE: PLEASE HELP - Moment or Shear Connection ??

You can mix moment frames and braced frames in the same building, but not in the same connection. For the moment connection to work, the frame needs to move laterally. Your braced frame will be so stiff that it will never move enough laterally to engage the moment connection.

RE: PLEASE HELP - Moment or Shear Connection ??

Shear because it's braced. The better question is, should your support be fixed or pinned? Right now you have it fixed, it maybe pinned.

RE: PLEASE HELP - Moment or Shear Connection ??

Definitely braced. (If you have a diaphragm to distribute the forces.)

By the way, be sure you can place the braces as you show them (especially the horizontal/plan bracing on the top floor). Usually in a manufacturing facility (even if it is for storage) you are running into someone else's space with a brace layout like that (i.e. HVAC, piping, etc).

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