CONCRETE STRUCTURES

Selection Criteria:

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	column spacing

		5' - 100'

	design loads

		40 psf residential

		50 psf commercial

		100 psf specialty design

	One-Way Slab

		6'-12'

		4" min. thickness

		thickness = span/30 for floor slabs

		thickness = span/36 for roof slabs

	One-Way Joist Slab

		15'-36'

		2.5 - 4.5" min.

		6" - 20" joist depth

		min. total depth = span/24

	Two-Way Waffle Slab

		20' - 48' span

		2.5 - 4.5" min.

		6" - 20" joist depth

		min. total depth = span/24

		solid heads over columns

	Two-Way Slab with Beams

		15'-40' span

		4" min.

		depth = slab perimeter/180

	Two-Way Flat Slab

		15'-40' span

		4" min.

		min. slab depth = span/36

		6"-12" typical

		drop panel min. depth = span/85

		drop panel min width = 0.4 span

	Two-Way Flat Plate

		15'-36' spans

		5" min.

		span/33

	Precast Solid Flat Slab

		4'-0" wide

		thickness	span

		4"		12'-16'

		6"		14'-24'

		8"		18'-30'

	Precast Hollow Core Slab

		4'-0" wide

		thickness	span

		6"		14'-22'

		8"		20'-32'

		10"		24'-40'

		12"		30'-44'

	Precast Single Tee

		6', 8', 10', 12' wide

		thickness	span

		12"		28'-40'

		18"		36'-50'

		24"		45'-70'

		32"		54'-80'

		36"		62'-90'

		48"		80'-110'

	Precast Double Tee

		4', 6', 8', 10', 12' wide

		thickness	span

		12"		28'-40'

		18"		36'-50'

		24"		45'-70'

		32"		54'-80'

		36"		62'-90'

		48"		80'-110'

	Precast Rectangular Beam

		12" or 16"  wide

		thickness	span

		20"		18'-30'

		28"		22'-40'

		36"		26'-50'

		44"		30'-56'

		52"		34'-70'

		60"		42'-80'

	Precast L-shaped Beam

		12" wide

		leg 6" wide

		leg = 1/3 of depth

		thickness	span

		20"		18'-30'

		28"		22'-40'

		36"		26'-50'

		44"		30'-56'

		52"		34'-70'

		60"		42'-80'

	Precast Inverted Tee Beam

		24"  wide

		legs 6" wide each

		legs = 1/3 of depth

		thickness	span

		20"		18'-30'

		28"		22'-40'

		36"		26'-50'

		44"		30'-56'

		52"		34'-70'

		60"		42'-80'