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How to detail a walking column as shown?

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Kumar_Abhishek_SinghBronze Sponsor

Joined: 18 Nov 2010Posts: 358Location: New Delhi

Posted: Wed Aug 29, 2012 7:03 am Post subject: How to detail a walking column as shown?Dear All,

Please go through the attachments with this post.

The problem here is to detail a three storied walking column transfer structure. It connects two column offset-ted from each other horizontally.

I have shown two proposed reinforcement arrangements. the first one is shown in GREEN ink wherein the bars will be bent. The second option is shown in the BLACK ink wherein the bars will remain straight throughout the transfer structure. My question is, that in this scenario which detailing is better and why?

Also please have a look at the vertical stress contours uploaded, which I obtained from ETABS. The stresses shown in GREEN are of interest here. these contours are due to the 12000kN point load only.

Please bear with my hand drawing. This sketch might look very very confusing due to too many colours and too many lines, but I did that just to get the information through to you guys properly.

Eagerly awaiting your reply.

Walking Column vertical stresses (MPa).jpg Description: VERTICAL STRESSES IN N/mm2 Filesize: 118.02 KB Viewed: 425 Time(s)

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walking column diagram.jpg Description: GEOMETRY AND DETAILING Filesize: 327.18 KB Viewed: 442 Time(s)

_________________Thank you, Kumar Abhishek Singh

(M.Tech., IIT Delhi)

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rahul.leslieGeneral Sponsor

Posted: Thu Aug 30, 2012 5:09 am Post subject:



Joined: 01 Apr 2008Posts: 430Location: Trivandrum

I have no experience of doing something like this, but I thought it might help to get an insight into how the directions of the principal (tensile) stresses are so it has been put it in STAAD.Pro, so that it can be later meshed and taken to ANSYS. But what are the loads coming from the slabs shown in blue (see fig.)? And what are the length, thickness & effective width of the slabs that constrain it from the sides?

Rahul Leslie

Walker.GIF Description: Filesize: 5.28 KB Viewed: 409 Time(s)

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Posted: Thu Aug 30, 2012 5:46 am Post subject:

Hi Rahul,

The slab thickness as shown in the diagram is 250mm and effective length and width of the slab that is constraining it from the sides can be taken as width=4m and length = 8 m_________________Thank you, Kumar Abhishek Singh


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Posted: Fri Aug 31, 2012 11:06 am Post subject:

Dear Abhishek, shown below is the principal stress vector diagram, and hope it helps in arriving at a conclusion. To me, it seems that the one shown in the BLACK ink wherein the bars will remain straight throughout the transfer structure is the better option. And my fellow SEFIans, please contribute with your comments.




And, if you like to have the model files or other screen shots, please drop a mail to [email protected]

Rahul Leslie

Walker_STD.GIF Description: STAAD model Filesize: 5.17 KB Viewed: 385 Time(s)

Walker_StressYboth.GIF Description: Vertical Stresses Filesize: 15.7 KB Viewed: 388 Time(s)



Walker_P1both.GIF Description: Principal stresses vector diagram Filesize: 12.59 KB Viewed: 418 Time(s)

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btgprasad...

Posted: Wed Sep 05, 2012 5:53 am Post subject:

I would prefer placing reinforcement in orthogonal directions. it will take care of out of plan bendind(accidental) and stress concentration at corners.



Joined: 05 Aug 2008Posts: 116

theoretically it is good to put reinf. in principal stress direction,There may be slight change in principal stresses path during cracking.

Though interesting to work on this, cant such configuration be avoided ?!! Cant say no to architect.??

btg

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Posted: Tue Sep 11, 2012 3:59 am Post subject:

Quote:

I would prefer placing reinforcement in orthogonal directions. it will take care of out of plan bendind(accidental) and stress concentration at corners.

theoretically it is good to put reinf. in principal stress direction,There may be slight change in principal stresses path during cracking.

No, no... I didn't recommend to "put reinf. in principal stress direction" but it is that since the principal stresses are more closer to the vertical direction than the diagonal direction,...

Quote:

to me it seems that the one shown in the BLACK ink wherein the bars will remain straight throughout the transfer structure

... is the better option -- ie., along the vertical and horizontal (orthogonal) directions. Please don't get me wrong.

And Kumar Abhishek, no opinion was heard from you!

Rahul Leslie

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Posted: Tue Sep 11, 2012 6:08 am Post subject:

Hi Rahul,

Apologies for the delayed response. I took your view and the vector diagram that you uploaded and put it in front of the UK engineers. I was waiting for their feedback on it. I had prepared the drawing(s) as per what you had recommended and yesterday I got a go ahead from them.

I thank you again for sorting this out for me. It was a good piece of learning for me.

Cheers!_________________Thank you, Kumar Abhishek Singh


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shirishmehta3SEFI Regulars

Joined: 21 Jun 2010Posts: 23

Posted: Wed Sep 19, 2012 3:19 pm Post subject:

Dear Er. Abhishek

The whole assembly seems to me like a Transfer Corbel. Isnt it possible to detail the whole setup as a Corbel?? The load coming from the top column shall be distributed as T and C (the way corbels are analysed using strut and tie approach) and reinforcement details shall follow typical corbel details. However care should be taken to consider the heavy rotations setup in the slabs.

Regards Shirish

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