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Registered: ‎01-03-2013
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Rc slab Punching verification (by maps and rc slab provided reinforcement )

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01-03-2013 06:23 AM

Dear sir 

Is the punhing shear verfication by checking the principal shear strees in  maps  gives the same results of verfication punching  by rc slab provided reinforcement .

 

regards

 

Eng Mustafa Hesenow
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Artur.Kosakowski
Posts: 4,255
Registered: ‎12-17-2010

Re: Rc slab Punching verification (by maps and rc slab provided reinforcement )

01-03-2013 11:22 PM in reply to: mustafa-hesenow

These results are different mainly because the design code tells you how to determine the critical perimeter whereas the stress is displayed in a selected position within a slab.

 

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Artur Kosakowski
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Registered: ‎01-03-2013

Re: Rc slab Punching verification (by maps and rc slab provided reinforcement )

01-06-2013 05:02 AM in reply to: Artur.Kosakowski

Dear sir 

What i was mean by my Question is 

if we take the reading of shear stresses after check the reduced forces above columns support at  the same distance from the face of the column permitted in the code is this value from the maps will be the same or closed to the value calculated in rc slab provided reinforcement in the punching check .

 

What i know : in the calculation of shear stresses in the map 

the formula is ;

T= Q*S/B*I      which is mean the the unbalanced moment which is going to the columns is not considered .

 

But for the calculation of shear stresses in rc slab provided reinforcement  whis is according to the used code is ;

 

T = Q/b*d + Mux*y/Jx +Muy * x/Jy

 

which is mean the unbalanced moment taken in consideration Of the shear stress as per code parametes but didnt taken in consideration in the map result .

 

kindly confirm if this understanding is correct .

 

Eng Mustafa Hesenow
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Artur.Kosakowski
Posts: 4,255
Registered: ‎12-17-2010

Re: Rc slab Punching verification (by maps and rc slab provided reinforcement )

01-07-2013 12:46 AM in reply to: mustafa-hesenow

The valued on the map are calculated based on the shear force only with no influence of bending.



Artur Kosakowski
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