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RE: Tension in Concrete

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Unless it's a combined footing, or you're counting on backfill above the
footing to resist overturning (unsafe in my opinion), how do you get tension
in the top??  On the other hand, once the concrete cracks, whether due to
shrinkage or whatever, you can't take ANY tension in the concrete.

		-----Original Message-----
		From:	Alex C. Nacionales [SMTP:anacio(--nospam--at)]
		Sent:	Thursday, January 21, 1999 3:31 PM
		To:	seaint(--nospam--at)
		Subject:	Tension in Concrete


		I would like your opinion regarding using the tensile
strength of concrete(10% of Fc') in structural computations. 
		This would be economical in thick shallow footings subjected
to large moments where top reinforcement would be needed if the tensile
strength of concrete is neglected.

		Alex C. Nacionales
		Iloilo City, Philippines