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

designing a RC frame that is connected to a buidling just by timber roof

designing a RC frame that is connected to a buidling just by timber roof

(OP)
Im wondering how would you guys design a RC frame (colums are 250 mm in diameter, beam is 400/300 mm) that is around the building and is connected with a building just by roof (rafters + timber sheating).

Would you design this frame as a moment frame or not?

Im thinking that RC frame is going to be loaded only verticaly hence no need for a moment frame. All horizontal forces (wind, earthquakes) will get transfered to the structure inside the RC frame, since frame is connected to this structure by roof (i thinkg rafters + sheating on top will act as diaphragm which will transfer horizontal loads from RC fram to building).

Because of that do you think there is a need to run rebars from columns to beam or is this not necesary since I dont need a moment frame? I think that columns will be sufficiently anchored to single foundations (Id design it as fixed supports) so columns kinda act as cantilevers anyway...








RE: designing a RC frame that is connected to a buidling just by timber roof

Is the concrete you show the primary lateral load resisting system? If so, you only have frames in one direction. The columns are cantilevered in the other.

RE: designing a RC frame that is connected to a buidling just by timber roof

As long as the building proper has it's own competent lateral system, I'd be happy to say that the concrete frames just go along for the ride. They'll see some nominal lateral loads but I think that's okay. They'll also have some nominal lateral load capacity. Of course, if you're high seismic, there'd be all kind of stuff to worry about like connecting the frames to the diaphragm robustly etc.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: designing a RC frame that is connected to a buidling just by timber roof

Quote (mats12)

Because of that do you think there is a need to run rebars from columns to beam or is this not necesary since I dont need a moment frame? I think that columns will be sufficiently anchored to single foundations (Id design it as fixed supports) so columns kinda act as cantilevers anyway...

I question the decision to use concrete columns and beams in a wood building but that is not what you asked. Whether you design the concrete frames to resist moment or not, it is simply good practice to extend column steel into the beams. If the structure is adequate to resist wind and seismic forces without reliance on concrete members, then designing moment frames is not essential.

BA

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


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