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shear heads and effective length

shear heads and effective length

shear heads and effective length

(OP)
Im looking at an existing two way slab, that seems to be underdesigned for the given loadings on the design documents.  The slab uses some steel beams for shear heads @ the columns.  Does anyone know if these shear heads can be used to reduce the effective length for the span?  I am aware of the contribution of negative moment capacity that ACI permits, but I am having problems with the positive moments as well.  Any thoughts or Knowlege of this mater would be greatly appreciated.

 Thanks,
    Leo Doyer

RE: shear heads and effective length

"Reinforced Concrete"  by James MacGregor has an excellent discussion regarding the history of two-way slabs.  In a nutshell, many older slabs were not designed for the loadings as prescribed by current ACI requirements.  I do not know the age of the slab you are investigating, but I have encountered similar problems with two-way slabs constructed in the 1930's and '40s.

I am by no means an expert, but I do not believe that you can reduce the span for the shear heads.  Again, MacGregor's book is an excellent reference for this matter.

Good luck.

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