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.

Slab design with wall load
Goto page 1, 2, 3  Next
 
Post new topicReply to topic Thank Post    www.sefindia.org Forum Index -> SEFI General Discussion
View previous topic :: View next topic  
Author Message
ramu_se
SEFI Regulars
SEFI Regulars


Joined: 30 Oct 2017
Posts: 35

PostPosted: Fri Sep 25, 2020 11:48 am    Post subject: Slab design with wall load Reply with quote

Dear All,

How to design the two way slab when the wall load in coming on the slab?

I have attached the image of the slab.

Please guide me how to design this kind of slab.

Regards,
Ramu.



slab image.png
 Description:
 Filesize:  9.71 KB
 Viewed:  28 Time(s)

slab image.png


Back to top
View user's profile Send private message
renju mathew
SEFI Member
SEFI Member


Joined: 18 Feb 2016
Posts: 15

PostPosted: Sun Sep 27, 2020 2:36 am    Post subject: Reply with quote

Dear ramu,

This slab spans much bigger. So, if the slab is discontinuous on all four edges, then the thickness of slab will be 150mm and rebars - 12 mm dia Bars at 175 mm C/C on towards both directions. This design is uneconomical in my point of view. so you might consider splitting this slab into two by providing a beam under that wall which comes over the slab.

You can provide concealed beams under the walls if the distance between the wall and the support is less than 2 m. in this case, i think its not possible.
Back to top
View user's profile Send private message
es_jayakumar
General Sponsor
General Sponsor


Joined: 24 Nov 2011
Posts: 1373
Location: Cochin

PostPosted: Sun Sep 27, 2020 5:45 am    Post subject: Reply with quote

As pointed out by Er.Renju Mathew, you have to provide sufficient depth to the slab, considering its large  span (4.8m). As advised by him, try to introduce a beam below the proposed wall. If there is no door opening in the wall, you can choose to make the beam up-standing also, should you want to avoid the unsightliness of the beam projection beneath. If you cannot try light weight partitions (wooden, aluminium, AAC block etc.) for the wall, use half-brick wall. If the supporting beam has to be done away with, you have to analyse the two-way slab using "Pigeaud"s Curves". A worthy worked out example for a similar case can be found in the book "Design of Reinforced concrete Structures" by Ashok Kumar Gupta (Galgotia Publications). I think, this book is out of print now. You can analyse the slab using STAAD also, by modeling the it using plate elements. Don't forget to check the deflection of the slab.

E S Jayakumar
Back to top
View user's profile Send private message
ramu_se
SEFI Regulars
SEFI Regulars


Joined: 30 Oct 2017
Posts: 35

PostPosted: Sun Sep 27, 2020 8:37 am    Post subject: Reply with quote

Thank you Renju sir and Jayakumar sir.
Back to top
View user's profile Send private message
ramu_se
SEFI Regulars
SEFI Regulars


Joined: 30 Oct 2017
Posts: 35

PostPosted: Sun Sep 27, 2020 1:56 pm    Post subject: Reply with quote

Dear Jayakumar sir,

I have done staad model for the slab and got maximum deflection as 5.4mm.I have converted the wall load as nodal load and applied on the plate nodes.
Attached the loading details for your reference. Please correct me if anything wrong.

Regards,
Ramu.



loading.png
 Description:
 Filesize:  254.25 KB
 Viewed:  18 Time(s)

loading.png


Back to top
View user's profile Send private message
es_jayakumar
General Sponsor
General Sponsor


Joined: 24 Nov 2011
Posts: 1373
Location: Cochin

PostPosted: Sun Sep 27, 2020 2:12 pm    Post subject: Reply with quote

Please post the STAAD file.
Back to top
View user's profile Send private message
ramu_se
SEFI Regulars
SEFI Regulars


Joined: 30 Oct 2017
Posts: 35

PostPosted: Sun Sep 27, 2020 3:16 pm    Post subject: Reply with quote

Sir,Please find the staad file.


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.
Staad.rar
 Description:

Download
 Filename:  Staad.rar
 Filesize:  365.55 KB
 Downloaded:  56 Time(s)

Back to top
View user's profile Send private message
badamsundararao
...
...


Joined: 24 Dec 2009
Posts: 213
Location: KAKINADA ANDHRA PRADESH

PostPosted: Sun Sep 27, 2020 5:15 pm    Post subject: BRICK WALL ON SLAB Reply with quote

Design a beam to a width of 100mm+2x depth of slab,sothat,the wall load will be disbursed@45degrees ,with depth of beam from minimum depth as per deflection consideration,so that the beam depth may not affect much from Ambiance point of view. Use AAC blocks to reduce the Dead load.
Back to top
View user's profile Send private message Visit poster's website
es_jayakumar
General Sponsor
General Sponsor


Joined: 24 Nov 2011
Posts: 1373
Location: Cochin

PostPosted: Mon Sep 28, 2020 2:12 am    Post subject: Reply with quote

ramu_se wrote:
Sir,Please find the staad file.

Why have you taken the floor finish and partition loads in upward direction ?
Correct it, design the slab manually and post the details please.

E S Jayakumar
Back to top
View user's profile Send private message
ramu_se
SEFI Regulars
SEFI Regulars


Joined: 30 Oct 2017
Posts: 35

PostPosted: Mon Sep 28, 2020 10:04 am    Post subject: Reply with quote

I have analysed the beam in staad.

Beam size 400 width(100+2xdepth of slab)and 150mm depth since i have considered 150mm slab thickness

wall load - 3.15 kN/m
wall thickness- 150mm,AACblocks

We have to design this beam and provide reinforcement for 400mm wide beam inside the slab?

Please find the attached file.

Regards,
Ramu.



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.
beam.rar
 Description:

Download
 Filename:  beam.rar
 Filesize:  432 Bytes
 Downloaded:  40 Time(s)

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
Goto page 1, 2, 3  Next
Page 1 of 3

 

 
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