Punching Shear

[duafar]

hello everyone

Can anyone tell me a book that explains the technics for strengthening slabs to punching shear.
I have a problem of punching and I can't find nothing about it.

Thank You very much

 

[tincan]

Do you mean the shear developed in the floor slab at the critical section/perimeter of the column? Check the PCA for spearhead reinforcement. The addition of channels in a cross configuration works.

Best, Tincan

 

[PEStructural]

ACI 318-02, Section 11.12 (Section 11.12.1.2 in particular). Other ACI 318 codes have the same provisions.

 

[duafar]

What about some kind of exterior prestressing that could strength punching shear??

 

[Ingenuity]

Is this an EXISTING slab that requires strengthening for punching shear?

If so, column collars, caps or steel sections adequately fastened to the u/s of the existing slab has been done before.

Column enlargement is also a possibility. But more expensive than caps or collars. If steel sections are installed to the u/s of the slab, you would need to check fire rating issues.

External PT will also work depending on the slab arrangement/geometry, but typically will only be economic in existing slab strengtening applications if other deficiencies are present (eg flexural and/or deflection problems too).

Re books about punching shear strengthening....not much out there, but a paper my Pete Popovic from WJE (Chicago) covers concrete shear collars....let me know if you are interested and I will try and get you a copy.

ACI Manual of Concrete Practice (5 volume set or CD) has a document on slab strengthening that I think covers punching shear strengthening to existing slab.

HTH

 

[dtizhoosh]

Hello everyone
Please introduce me some reference and usefull books about storage tanks for liquids such as water and oil and for gas.
tanks very much.