www.sefindia.org

STRUCTURAL ENGINEERING FORUM OF INDIA [SEFI]

 Forum SubscriptionsSubscriptions DigestDigest Preferences   FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups  RegisterRegister FAQSecurity Tips FAQDonate
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log in to websiteLog in to websiteLog in to websiteLog in to forum 
Warning: Make sure you scan the downloaded attachment with updated antivirus tools  before opening them. They may contain viruses.
Use online scanners
here and here to upload downloaded attachment to check for safety.

How to design "floating or planted column"?

 
Post new topicReply to topic Thank Post    www.sefindia.org Forum Index -> SEFI General Discussion
View previous topic :: View next topic  
Author Message
aamir07
SEFI Member
SEFI Member


Joined: 04 Apr 2017
Posts: 1

PostPosted: Sat Jan 06, 2018 1:18 pm    Post subject: How to design "floating or planted column"? Reply with quote

I am designing a g+3 storied residential building in which a column needs to start from outer beam on 3rd floor and goes upto mumty level as per architectural drawing. How do i design that column?
Back to top
View user's profile Send private message
es_jayakumar
General Sponsor
General Sponsor


Joined: 24 Nov 2011
Posts: 1408
Location: Cochin

PostPosted: Sun Jan 07, 2018 11:05 am    Post subject: Reply with quote

Dear Er. Aaamir,
Floating columns are never advisable in a framed structure, in seismic point of view. How come the Architect has suggested it ? The structural engineer can do away with it while planning the structural system. See  :         http://www.iitk.ac.in/nicee/EQTips/EQTip26.pdf  
Floating columns are more harmful if provided in lower floors. If it is absolutely necessary, then you have to design a proper transfer girder.
If it is required for architectural requirement, you can provide a dummy brick pillar also.

Regards,
E S Jayakumar
Back to top
View user's profile Send private message
bkkk
...
...


Joined: 25 Mar 2009
Posts: 203
Location: Tamil Nadu

PostPosted: Tue Jan 09, 2018 1:25 pm    Post subject: floating columns Reply with quote

Dear sefian,

As a structural engineer, we should advise against the provision of floating columns in a structure. Architects may not aware of its implications, as the floating columns  are more vulnerable to seismic forces. Convince your architect for an alternate solution.

Er.Venkat
Back to top
View user's profile Send private message
btgprasad
...
...


Joined: 05 Aug 2008
Posts: 125

PostPosted: Mon Jan 15, 2018 12:10 pm    Post subject: Reply with quote

Dears


Here I’m not denying fact that building with floating columns will be underperforming compared to the structurally regular building but why do you compare when the regular structural system is not of your interest in this case, you deal those shortcomings in structural engineering terms. There are many such designs worldwide from small buildings to gigantic landmarks.


please do not get the impression that No matter what we should avoid those structural configurations, if so below buildings would be not a reality and Architecture or real estate industry never be cherished if a structural engineer thinks so.


It is absolutely possible to design building with STRUCTURAL irregularities as long as load-path is ensured and structurally justified for all loading combinations


It only requires some additional efforts in terms of calculations, detailing and QA in construction. For small building projects, it is very difficult to invest such computational efforts hence engineers sometimes try to avoid, as we don’t get paid for it, unfortunately.


Keep trying it.



Untitled1.jpg
 Description:
 Filesize:  132.02 KB
 Viewed:  464 Time(s)

Untitled1.jpg




Last edited by btgprasad on Wed Jan 17, 2018 9:58 am; edited 1 time in total
Back to top
View user's profile Send private message
Abhishek_Singh
Bronze Sponsor
Bronze Sponsor


Joined: 18 Nov 2010
Posts: 613

PostPosted: Wed Jan 17, 2018 6:42 am    Post subject: Re: How to design "floating or planted column"? Reply with quote

Lets keep the IS code on one side as it is very unrealistic and conservative, especially the new 1893 code. I have discussed certain provisions like banning floating columns, restriction on flat plates with structural engineers in Europe and the US and they all have shown discomfort with such a restriction.


Anyways back to the problem in hand, yes you can provide floating columns only for mumty type situations but just be sure to brace it to the nearby columns (which erect from a foundation..not a floating column again) in both directions. You can hide your brace inside the brick walls.

Its a suggestion. Talk to your manager about this. Dont lose your job over a SEFI blog!!


Abhishek


aamir07 wrote:
I am designing a g+3 storied residential building in which a column needs to start from outer beam on 3rd floor and goes upto mumty level as per architectural drawing. How do i design that column?
Back to top
View user's profile Send private message
Noor ul haq
SEFI Member
SEFI Member


Joined: 17 Jun 2016
Posts: 19

PostPosted: Fri Jun 29, 2018 10:26 am    Post subject: Reply with quote

btgprasad wrote:
Dears


Here I’m not denying fact that building with floating columns will be underperforming compared to the structurally regular building but why do you compare when the regular structural system is not of your interest in this case, you deal those shortcomings in structural engineering terms. There are many such designs worldwide from small buildings to gigantic landmarks.


please do not get the impression that No matter what we should avoid those structural configurations, if so below buildings would be not a reality and Architecture or real estate industry never be cherished if a structural engineer thinks so.


It is absolutely possible to design building with STRUCTURAL irregularities as long as load-path is ensured and structurally justified for all loading combinations


It only requires some additional efforts in terms of calculations, detailing and QA in construction. For small building projects, it is very difficult to invest such computational efforts hence engineers sometimes try to avoid, as we don’t get paid for it, unfortunately.


Keep trying it.






" ABSOLUTLY MATURE REPLY FROM YOUR END "

Wow i m impressed
Back to top
View user's profile Send private message
mainak.mallik
SEFI Member
SEFI Member


Joined: 14 Aug 2012
Posts: 15

PostPosted: Sat Jun 30, 2018 8:30 am    Post subject: How to design "floating or planted column"? Reply with quote

Please note that as per latest IS1893 (P1) floating column is not allowed for any sort of building,  specially located in zone 3 to zone 5.Regards, 
Mainak Mallik 

Posted via Email
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topicReply to topic Thank Post    www.sefindia.org Forum Index -> SEFI General Discussion All times are GMT
Page 1 of 1

 

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


© 2003, 2008 SEFINDIA, Indian Domain Registration
Publishing or acceptance of an advertisement is neither a guarantee nor endorsement of the advertiser's product or service. advertisement policy