×
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

Concrete Portal frame
2

Concrete Portal frame

Concrete Portal frame

(OP)
Has anyone ever designed a concrete portal frame?
If so how did you go about designing the column to rafter transitions/connections?
Is there any literature on this at all?

Thanks all!

RE: Concrete Portal frame

Yes but not in a seismic zone, is this a seismic zone?

There is plenty of literature on concrete detailing, I suggest you google it.

RE: Concrete Portal frame

(OP)
Not in a seismic zone.

RE: Concrete Portal frame

(OP)
Im interested in the connection details of beam to column with a construction joint at the column and the rbar layout.

Precast concrete construction and/or insitu.

Anyone can help me ?

RE: Concrete Portal frame

use "Structural Details in Concrete" book by M.Y.H. bagash very good reference for detailing.   

RE: Concrete Portal frame

(OP)
Thanks Gyroman

But I couldn'y find any reference to that book in Amazon.  Is it an old book or something like that?

RE: Concrete Portal frame

(OP)
Actually theres a site that you can download it from.  But I cant do it !  Can it be downloaded?

Thanks

Looks like a good book!

RE: Concrete Portal frame

I suggest you get proficient in the strut and tie method of design, as it is applicable to the knee region of a portal frame.  For a start, check out threads on this site, including one currently active on the "Structural Engineering Other Topics" forum.

RE: Concrete Portal frame

(OP)
Thanks!

I will look into Strut and Tie method.  Hokkie66 is this method used frequently here in Australia?  Are concrete portal frames used much here also?

Gyroman10 where is it possible to get Bagash "Structural Details in Concrete" from?

RE: Concrete Portal frame

The strut and tie method is used in Australia.  In my experience, it is mostly used for pile caps, corbels, setdowns in beams and slabs, and any member where the ratio of length to depth is say 4:1 or less.  Your Warner, Rangan, et al book has a good primer, and the paper which csd72 referenced is good also.

Concrete portal frames are rare here, I believe.  It would be interesting to know your application.

RE: Concrete Portal frame

(OP)
Thanks Hokie66

I see Warner, Rangan at el has a whole chapter on the method.

I'll look into it.  Obviously the method  hasn't been around all that long right?

RE: Concrete Portal frame

(OP)
Hokie66!

Been asked by a precast concrete firm the merits of using concrete portals.  I agree concrete portals not used much here.

RE: Concrete Portal frame

Not sure how long it has been around, but the Warner Rangan et al "bible" didn't include it in the 1989 edition, but did in the 1998 one.

There are lots of pitfalls in designing for the forces around a knee in concrete.  I try to avoid this type structure, and am very conservative if forced into using one.  As well as the strut and tie information, read the Chapter in Warner "Guidelines for Detailing".  Makes you very wary of this type connection.

RE: Concrete Portal frame

i did a concrete portal frame once, and had to subcontract a part of job to a Phd engineer who modeled the joints using ANSYS, he did the finite element analysis on the joint. The portal frame was 78' feet span.

civeng80 i am sorry i dint find the book on any internet book store, i bought this book from amazon.com 7 years ago.

 

RE: Concrete Portal frame

(OP)
Thanks gyroman10

Very interesting your span is about what Im looking at at the moment.  I note that the portal is in two parts and pinned at the ridge point.  Just wonder how its erected and the roofing material and walling was it all concrete or metal?

What sort of dimensions did he come up with for beam and columns??

Cheers!

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