1. Cantilever/Gravity Walls Bar lists and estimates from standard design sheet 1

2. Cantilever/Gravity Walls Cantilever walls have footings forward/back of the wall (wall is essentially a cantilevered structure Gravity walls have no footings 2 http://content.answers.com /main/content/img/McGraw Hill/atchitecture/f0169- 02.png http://www.gravesconcrete.com/allaboutretainingwalls.htm

3. Precast 3 http://www.humes.com.au/ProdsServices/ PrecastConcrete/PC_StorageWalls.shtml

4. 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 Handouts are old, rescinded standard sheets given solely for the educational purpose of looking at details and deriving bar lists. 4

5. Some assumptions used for std. design Unit wt of earth – 120 pcf Unit wt of concrete – 150 pcf Active 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 5

6. All retaining walls are structures ---- -possible failure modes Overturning Sliding Eccentricity (footing can lift) Bearing pressure (footing can burrow into the soil) Rotational stability Settling 6

7. Retaining Wall Failures http://www.youtube.com/watch?v=EXjVX aqWDLo http://www.youtube.com/watch?v=EXjVX aqWDLo 7

8. Example Given: Stem 8’ Min. Allowable soil pressure=1 Ton/sq ft Design friction coefficient= 0.5 Wall is 40’ long 8

9. Example From Design Std: Footing width: 5’-2” Toe Projection: 1’-8” T Bars #5@18” H Bars #5@18” D Bars #5@18” B Bars #5@18” Concrete Unit Quantity: 0.88 cy/lf 9

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11. Drawing/Bar Marks Bar marks different than shown on standard drawings E indicates epoxy coated bars 11

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