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Common Footing for buildings column seperated for movement j

 
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saistructure
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PostPosted: Tue Aug 10, 2004 4:45 am    Post subject: Common Footing for buildings column seperated for movement j Reply with quote

˜

Dear friends,

Can we have common footing for columns of buildings, which are seperated by movemement joints of about 3"(75mm)?


Hiren Desai 

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saistructure
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PostPosted: Tue Aug 10, 2004 2:39 pm    Post subject: Common Footing for buildings column seperated for movement j Reply with quote

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Dear Kamal,

You have not interpreted my question correctly, still let me know how you will calculate C.G. for two columns having diffren axial loads, Mx and My and these values are diffren for 21 loadcases.

Hiren Desai

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acpl_sefi
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PostPosted: Tue Aug 10, 2004 7:12 pm    Post subject: Common Footing for buildings column seperated for movement j Reply with quote

Dear Mr. Hiren Desai

Its been discussed on this forum before. We don't consider the footing to be a fixed support--since even the slightest rotation destroys the moment--therefore it is approprite to consider it as a pin. We only find out the CG for the gravity loads combination--we do it all the time.  

Vipul Ahuja


On Tue, 10 Aug 2004 saistructure@rediffmail.com wrote :


Dear Kamal,

You have not interpreted my question correctly, still let me know how you will calculate C.G. for two columns having diffren axial loads, Mx and My and these values are diffren for 21 loadcases.

Hiren Desai





Structural Engineers Forum of India

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rr_vemuri
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PostPosted: Wed Aug 11, 2004 4:38 am    Post subject: Common Footing for buildings column seperated for movement j Reply with quote

Dear friends,
We have made a spread sheet programme in EXCEL to consider the critical case to find maximum ecc. of all the load cases for each direction and design the footing for maximum eccentricity of both directions and apply it as if the same ecc. will be applicable for both cases. After having found that large ecc occur in seismic cases , we have adopted the case of Maximum load and corresponding eccentricity.- rangarao

On Wed, 11 Aug 2004 acpl_sefi@rediffmail.com wrote :


Dear Mr. Hiren Desai

Its been discussed on this forum before. We don't consider the footing to be a fixed support--since even the slightest rotation destroys the moment--therefore it is approprite to consider it as a pin. We only find out the CG for the gravity loads combination--we do it all the time. 

Vipul Ahuja


On Tue, 10 Aug 2004 saistructure@rediffmail.com wrote :


Dear Kamal,

You have not interpreted my question correctly, still let me know how you will calculate C.G. for two columns having diffren axial loads, Mx and My and these values are diffren for 21 loadcases.

Hiren Desai





Structural Engineers Forum of India  







Structural Engineers Forum of India

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