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plates ande surfaces

 
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies. Thank Post    www.sefindia.org Forum Index -> E-Conferences-2008 [ Flat Slab Design issues ]
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venkatesh
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PostPosted: Mon Dec 29, 2008 4:40 am    Post subject: plates ande surfaces Reply with quote

could anybody tell me when the plates and surfaces used in staad model and for shear wall modelling which one we have opt for? plate ot surfaces?
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rahul.leslie
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PostPosted: Mon Dec 29, 2008 4:42 pm    Post subject: Reply with quote

When you use plates as shear walls, you'll have to mesh it. But that would break up the beams and columns on it's periphery to small bits. And STAAD would then design each of those bits separately -- bit by bit -- rendering the results useless. This is where the surface scores over plates. The surface element gets meshed, while the beams and columns in it's periphery remain intact.
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arunkashikar
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PostPosted: Tue Dec 30, 2008 4:03 am    Post subject: plates and surfaces Reply with quote

This is something new for me. Can you through some more light on the ‘surface elements’. Do they belong to STAAD element library? And do you mean, even if they are monolithic with columns you need not mesh columns, even though elements are meshed?  
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Arun Kashikar


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From: rahul.leslie [mailto:forum@sefindia.org]
Sent: Monday, December 29, 2008 10:12 PM
To: econf@sefindia.org
Subject: [ECONF] Re: plates ande surfaces



When you use plates as shear walls, you'll have to mesh it. But that would break up the beams and columns on it's periphery to small bits. And STAAD would then design each of those bits separately -- bit by bit -- rendering the results useless. This is where the surface scores over plates. The surface element gets meshed, while the beams and columns in it's periphery remain intact.

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u.mukesh
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PostPosted: Tue Dec 30, 2008 9:38 am    Post subject: plates ande surfaces Reply with quote

Hello
ya I am also curious to know that how the compatibility of displacements of beams and columns and the surface element is ensured unless they are not meshed?

Regards
Mukesh Upadhyay


On Tue, Dec 30, 2008 at 9:42 AM, arunkashikar <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
  This is something new for me. Can you through some more light on the 'surface elements'. Do they belong to STAAD element library? And do you mean, even if they are monolithic with columns you need not mesh columns, even though elements are meshed?
Regards,
Arun Kashikar


Board line: +91 22 2571 9000 | Direct: +91 22 2571 9058 | Cell: 9819055576
Fax: +91 22 2571 9300 | Email: akashikar@hirco.com (akashikar@hirco.com) (akashikar@hirco.com (akashikar@hirco.com)) | Website: www.hirco.com


From: rahul.leslie [mailto:forum@sefindia.org (forum@sefindia.org)]
Sent: Monday, December 29, 2008 10:12 PM
To: econf@sefindia.org (econf@sefindia.org)
Subject: [ECONF] Re: plates ande surfaces



When you use plates as shear walls, you'll have to mesh it. But that would break up the beams and columns on it's periphery to small bits. And STAAD would then design each of those bits separately -- bit by bit -- rendering the results useless. This is where the surface scores over plates. The surface element gets meshed, while the beams and columns in it's periphery remain intact.









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M.ANBARASU
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PostPosted: Tue Dec 30, 2008 10:22 am    Post subject: plates ande surfaces Reply with quote

dear friend
i have used the plate as well as surface elemt for the same problem.
but the plate results are lower than surface why?
with regards
m.anbarasu
9942509440
On Mon, 29 Dec 2009 rahul.leslie wrote :
Quote:
When you use plates as shear walls, you'll have to mesh it. But that would break up the beams and columns on it's periphery to small bits. And STAAD would then design each of those bits separately -- bit by bit -- rendering the results useless. This is where the surface scores over plates. The surface element gets meshed, while the beams and columns in it's periphery remain intact.








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Kedar
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Joined: 23 Jul 2008
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PostPosted: Tue Dec 30, 2008 3:25 pm    Post subject: Reply with quote

Hello Anabarasu

Can you please the problem elaborate the problem
to all of us, you solved viz.

1.The apect ratio of elements
2.The boundary conditions.
3.The connection between plane and beam
elements.
4.Which results you got different,deflection,shear or moment
forces?
5.Loading.
6.Software used.


regards
Kedar
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rahul.leslie
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PostPosted: Wed Dec 31, 2008 6:03 pm    Post subject: Reply with quote

As far as I can understand, like ETABS here STAAD also uses a dual model approach -- one for the display, and another for the analysis engine. So the former model will have surfaces meshed, but it's edge columns and beams unmeshed, while the latter will have the surface's edge columns and beams meshed
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rahul.leslie
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PostPosted: Wed Dec 31, 2008 6:04 pm    Post subject: Reply with quote

Happy New Year to all...
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