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.

STEEL DETAILING IN MAT FOUNDATION

 
Post new topicReply to topic Thank Post    www.sefindia.org Forum Index -> SEFI General Discussion
View previous topic :: View next topic  
Author Message
RAJESH127
SEFI Member
SEFI Member


Joined: 12 Sep 2017
Posts: 2

PostPosted: Wed Sep 13, 2017 4:57 pm    Post subject: STEEL DETAILING IN MAT FOUNDATION Reply with quote

SIR,

WE HEREBY ATTACHING MX AND MY MOMENTS  (VALUES )OF MAT FOUNDATION ANALYSED IN SOFTWARE.

THICKNESS OF MAT IS 350 MM IN STAAD. THE POSITION OF COLUMN IN ALSO GIVEN IN AUTO CAD FILE ATTACHED HEREWITH. THE MAT FOUNDATION IS TO BE PROVIDED FOR RESIDENCE G+1

UNFACTORED COLUMN LOADS ARE ALSO ATTACHED



WE REQUIRE HOW TO PROVIDE STEEL DETAILS IN THIS MAT FOR MX AND MY VALUES.

IF POSSIBLE PLEASE PROVIDE SKETCH TO UNDERSTAND IT.

WE REQUES ALL SEFIANS TO GIVE VIEW THEIR AS IT HELPS TO UNDERSTAND BETTER



1f.jpg
 Description:
 Filesize:  223.8 KB
 Viewed:  173 Time(s)

1f.jpg



1c.jpg
 Description:
COULUMN POSITION
 Filesize:  52.6 KB
 Viewed:  159 Time(s)

1c.jpg



1D.jpg
 Description:
STAAD MOMENT VALUES
 Filesize:  426.85 KB
 Viewed:  152 Time(s)

1D.jpg


Back to top
View user's profile Send private message
thirumalaichettiar
Silver Sponsor
Silver Sponsor


Joined: 26 Jan 2003
Posts: 3459

PostPosted: Thu Sep 14, 2017 3:09 am    Post subject: Reply with quote

Dear Er.Rajesh,

First of all check the thickness with respect to strength and stability and deflection aspect.
As a rough guide the main reinforcement is for Mx and the the reinforcement in other direction -say Z axis as per STAAD is from My.
Usually the reinforcement for Mat is in two layers-Top & Bottom layers. Use the STAADFOUNDATION software which will aid u in the detailing.

If u send the STAAD file and the bearing capacity of soil may be possible to check and provide the details.

In general best practice is use another software or do check manually to check the correctness of the input and out put from STAADPRO.


Er.T.Rangarajan.
Back to top
View user's profile Send private message
abhio
...
...


Joined: 08 Mar 2010
Posts: 519

PostPosted: Mon Sep 18, 2017 10:42 am    Post subject: Reply with quote

Dear Er Rangarajan Sir,

I have to differ with you regarding your last post.

For an FE analysis, the local x and y axes of each element depend on the meshing orientation. In STAAD, Mx refers to the moment causing stress in the local x direction of the element.

Er Rajesh,
In order to find the reinforcement required at any location, find Mx, My and Mxy for that location. Combine Mx/ My with Mxy using the Wood-Armer equations, and provide reinforcement for the same.

For provided reinforcement, find concrete shear strength, and check against shear stress.
Back to top
View user's profile Send private message
RAJESH127
SEFI Member
SEFI Member


Joined: 12 Sep 2017
Posts: 2

PostPosted: Mon Sep 18, 2017 1:52 pm    Post subject: Reply with quote

sir,

for this particular case we have already given moment diagaram, column location., and moment values and aixal loads.

All we need to know that how to do detailing for this particular case...

whether it will be singly reinforced or doubly...

steel will required in top or bottom and where to curtail....

please guide with respect to above points.....
Back to top
View user's profile Send private message
abhio
...
...


Joined: 08 Mar 2010
Posts: 519

PostPosted: Mon Sep 18, 2017 2:59 pm    Post subject: Reply with quote

Dear Er Rajesh,

The STAAD sign convention defines positive moments as those creating tension at the top of the element. See the help file for more details. Be warned that the top of the element might not be the top of the raft, and depending on how you have meshed the structure, you could end up with opposite element directions adjacent to one another.

Find the element normal direction in order to identify which is the top surface.
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