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Beam Shear Capacity of Pile Supported Mat

Beam Shear Capacity of Pile Supported Mat

Beam Shear Capacity of Pile Supported Mat

(OP)
Petrochem industry

I am reviewing a very large pile-supported mat which will support 2ea heavy pieces of equipment.  The geometry of the mat is oversized relative to the equipment as it will also be used to support a lifting tower needed to set the equipment in place.  STAAD software was used to analyze the foundation using plate elements w/springs representing the piles.  The vertical shear stresses at the edge of the mat are practically zero.  The shear stresses near the reactor pedestals are very high...say 200psi.

Questions:
(1) Is a check for one-way beam shear required?
(2) If 'yes' above, do you look at say the worst case 1-foot wide strip to determine the design shear loads?  Do you have a reference which states you should use a 1-foot wide strip?
(3) Can you take the average shear stress across the mat width as typically done with smaller spread footings?

Note: before answering number 3 above, please note the mat width is almost 80feet wide.  The higher stress concentration is limited to say 2ea 15-foot wide sections in the middle of the mat.  The concern here is an averaging of the design stress may result in underdesign.

Thanks in advance,
 
 

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