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ACI A7.7.3??

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I just ran into a calculation where punching shear through a footing
supported on piles is being checked (punching or two-way shear around the
pile head). The calculation refers to ACI A7.7.3 for the well-known formula
of 2 times square root of f'c. Does this reference exist and is it for
punching shear? As far as I know ACI 318, section 11.3 addresses this
situation. However, for punching shear 4 times the square root of f'c should
be used, right?

	Jesús Gómez, Ph.D., P.E.
	Schnabel Engineering
	510 East Gay Street
	West Chester, PA 19380

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