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Welcome to e-conference on flat slabs
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mkalgal
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Joined: 26 Jan 2003
Posts: 54

PostPosted: Thu Dec 25, 2008 5:01 am    Post subject: Reply with quote

Dear Yogesh,

As for your enquiry regarding flat slabs with varying moments of inertia it can be done and has been done. Care has to be taken in modeling. The following article by Dr. Bijan Aalami, a renowned expert who developed the ADAPT software is a useful read.
http://www.adaptsoft.com/resources/Structural_Modeling_Slabs_CI_Dec2005.pdf


As regards openings in slabs, the following articles give  useful inputs

http://www.cement.org/buildings/Openings%20in%20Two%20Way%20Slabs.pdf
http://www.ptia.org.au/Photos/Penetrations%20in%20P-T%20slabs.pdf

regards

Kalgal
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ykalamkar
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Joined: 26 Jan 2003
Posts: 108
Location: Nagpur

PostPosted: Fri Dec 26, 2008 4:26 pm    Post subject: Welcome to e-conference on flat slabs Reply with quote

Thanks sir,
I have another question.
Sir,
I am modeling flat slabs in staad. I have applied seismic forces. Staad shows some moments and shear for seismic forces. Accordingly I have designed the slab. I am considering the shear SQX and SQY at d/2 away from the face of the column. I am considering the global moments in X and Z direction. I am also considering MXY and add it to the moment to calculate steel. I am not designing the slab by IS method. I am providing the steel as per moment and stress.  
My question is….
Shall I have to calculate additional moments due to unequal spans, additional shear while considering punching shear check? Is it necessary to satisfy the conditions given in IS456 regarding 3 nearly equal span and loading?
Regards
Yogesh  


From: mkalgal [mailto:forum@sefindia.org]
Sent: Thursday, December 25, 2008 10:32 AM
To: econf@sefindia.org
Subject: [ECONF] Re: Welcome to e-conference on flat slabs



Dear Yogesh,

As for your enquiry regarding flat slabs with varying moments of inertia it can be done and has been done. Care has to be taken in modeling. The following article by Dr. Bijan Aalami, a renowned expert who developed the ADAPT software is a useful read.
http://www.adaptsoft.com/resources/Structural_Modeling_Slabs_CI_Dec2005.pdf


As regards openings in slabs, the following articles give useful inputs

http://www.cement.org/buildings/Openings%20in%20Two%20Way%20Slabs.pdf
http://www.ptia.org.au/Photos/Penetrations%20in%20P-T%20slabs.pdf

regards

Kalgal

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mkalgal
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Joined: 26 Jan 2003
Posts: 54

PostPosted: Sat Dec 27, 2008 3:28 pm    Post subject: Reply with quote

Dear SEFIANs(wellversed with STAAD) answer Yogesh's Qn. pl.?
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ykalamkar
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Joined: 26 Jan 2003
Posts: 108
Location: Nagpur

PostPosted: Wed Dec 31, 2008 10:29 am    Post subject: -Design of flat slab under seismic forces. Reply with quote

Sir,
I am modeling flat slabs in staad. I have applied seismic forces. Staad shows some moments and shear for seismic forces. Accordingly I have designed the slab. I am considering the shear SQX and SQY at d/2 away from the face of the column. I am considering the global moments in X and Z direction. I am also considering MXY and add it to the moment to calculate steel. I am not designing the slab by IS method. I am providing the steel as per moment and stress.
My question is….
Shall I have to calculate additional moments due to unequal spans, additional shear while considering punching shear check? Is it necessary to satisfy the conditions given in IS456 regarding 3 nearly equal span and loading?
Regards
Yogesh

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