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Flanged Cruciform Sections

 
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ratnakishorerk
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PostPosted: Sun Jul 21, 2019 3:42 pm    Post subject: Flanged Cruciform Sections Reply with quote

I am masters student working on Power plant Design where I found most of the columns used there were Flanged Cruciform I sections.

Can anyone please eludicate about these Flanged Cruciform Sections?

What is the major advantage of using Flanged Cruciform Sections (Plus Sections ) over Box Sections???


With Regards

V.V. Ratna Kishore
M.SED
CEPT University
Ahmedabad
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Rudra Nevatia
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Joined: 26 Jan 2003
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Location: Mumbai

PostPosted: Mon Jul 22, 2019 2:39 pm    Post subject: Reply with quote

Hi Ratna Kishore,

Flanged cruciform sections are used for providing moment resisting frames in orthogonal directions.

A better option is to use I sections for moment resisting frames in one direction and braced frames in the perpendicular direction.

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Rudra Nevatia
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es_jayakumar
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PostPosted: Tue Jul 23, 2019 3:09 am    Post subject: Reply with quote

I hope, for equal weight of the section, box sections will be more efficient as compression members compared to flanged cruciform sections, as the latter can be susceptible to torsional buckling.

E S Jayakumar
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ratnakishorerk
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PostPosted: Tue Jul 23, 2019 7:05 am    Post subject: Reply with quote

Rudra Nevatia wrote:
Hi Ratna Kishore,

Flanged cruciform sections are used for providing moment resisting frames in orthogonal directions.

A better option is to use I sections for moment resisting frames in one direction and braced frames in the perpendicular direction.

Regards,
Rudra Nevatia




Respected Mr.Rudra Nevatia ,

Thank you for your  reply!

I just wanted to know more about these sections ! I gone through the internet and referred some papers but I did'nt got the actual design or bahaviour regarding those sections of my level .Can I get any structural behaviour / design references of those cruciform sections if available!

With Regards
V.V.Ratna Kishore
M.SED
CEPT University
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ratnakishorerk
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PostPosted: Tue Jul 23, 2019 7:35 am    Post subject: Reply with quote

es_jayakumar wrote:
I hope, for equal weight of the section, box sections will be more efficient as compression members compared to flanged cruciform sections, as the latter can be susceptible to torsional buckling.

E S Jayakumar




Respected Mr. E S Jayakumar

Thank you for your reply!

Yes the same thing I also intended to say then for seeking  the advantage of flanged cruciform sections over box sections!

Also I think the flanged cruciforms will be having greater structural properties compared to plain cruciforms.

Here I am attaching the experimental research paper which will give us a keen idea about that!!

Also If possible I request you to suggest any references regarding design and structural behaviour of these type of sections!!
Please correct me if I went wrong anywhere!



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Strength Comparision of Flanged & Plain Cruciform Sections.pdf
 Description:
Structural properties compartive study between Plain and flanged cruciforms.

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 Filename:  Strength Comparision of Flanged & Plain Cruciform Sections.pdf
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es_jayakumar
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PostPosted: Tue Jul 23, 2019 2:31 pm    Post subject: Reply with quote

Er. Kishore,
You said :
"Also I think the flanged cruciforms will be having greater structural properties compared to plain cruciforms"
Yes, by virtue of increased distribution of mass (in flanges) away from the neutral axes, which boosts the moment of inertia.
I hope you can design this section as compression member using the properties of buckling class-C, like any other built-up sections.


E S Jayakumar


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