Cantilever/Gravity Walls

Bar lists and estimates from standard design sheet

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Cantilever/Gravity WallsCantilever walls have footings forward/back of the wall (wall is essentially a cantilevered structureGravity walls have no footings *http://content.answers.com/main/content/img/McGrawHill/atchitecture/f0169-02.pnghttp://www.gravesconcrete.com/allaboutretainingwalls.htm

Precast*http://www.humes.com.au/ProdsServices/PrecastConcrete/PC_StorageWalls.shtml

Standard Design Sheets-CIP

Cantilever/Gravity Wall Standard

Note: Not to be used for design!!!! Handouts are old, rescinded standard sheets given solely for the educational purpose of looking at details and deriving bar lists.

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Some assumptions used for std. design

Unit wt of earth 120 pcfUnit wt of concrete 150 pcfActive earth pressure of soil behind wall 30 psf (level surcharge)A one-ft depth of surcharge was applied above the toe of the footing.Earth fill behind the wall was assumed w/ the top of finished grade 0.75 feet below wall coping

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All retaining walls are structures -----possible failure modesOverturningSlidingEccentricity (footing can lift)Bearing pressure (footing can burrow into the soil)Rotational stabilitySettling

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Retaining Wall Failureshttp://www.youtube.com/watch?v=EXjVXaqWDLo *

ExampleGiven:Stem 8Min. Allowable soil pressure=1 Ton/sq ftDesign friction coefficient= 0.5Wall is 40 long*

ExampleFrom Design Std:Footing width: 5-2Toe Projection: 1-8T Bars #5@18H Bars #5@18D Bars #5@18B Bars #5@18Concrete Unit Quantity: 0.88 cy/lf*

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Drawing/Bar MarksBar marks different than shown on standard drawingsE indicates epoxy coated bars*

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