1996-008193 - retaining walls - Laserfiche WebLink

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07/09/19'6 19:35 6124041947 BENEFITS DESIGN GRP PAGE 05 07-Q5-1896 07:54:58 "**DESIGN OF TREATED TIMBER RETAINING WALL'^•*•** THIS PROGRAM IS FOR DESIGNING-A RESTRAINING SYSTEM FOR A TREATED TIMBER RETAINING WALL WHICH USES PASSIVE PRESSURE TO SUPPORT THE ACTIVE EARTH PRESSURE. THE ACTIVE AND PASSIVE EARTH PRESSURES AFIE DERIVED BY VOING COULOMB'S EQUATION. THE 13ACKFILL IS ASSUMED TO BE WELL DRAINED GRANULAR MATERIAL. THIS TYPE OF WALL USES TIMBER WHICH EXTEND HORIZONTALLY INTO THE BACKFILL OF THE WALL,THESE MEMBERS ARE CALLED HEADER$. THE HEADERS ARE PERPENDICULAR TO THE FACE OF THE WALL. TI IE HEADERS ARE CONNECTED TO OTHER MEMBERS. IN THE BACKFILL CA14.E17 DEADMEM. THE DEADMEM ARE PARALLEL TO TI IE FACE OF THE WALL. *.****"*GIVEN INFORMATION"-*"WW *TYPE OF WALL:TWO TIERED *SETBACK BETWEEN WALLS:4.3 FT, *HEIGHT OF LOWER WALL;4.0 FT. *HEIGHT OF VPPER WALL:3.5 FT. *WEIGHT OF SOIL: 110 PCF "ANGLE OF INTERNAL FRICTUN:300 'ANGLE OF SLOPING BACKFILL:0" 'SURCHARGE:0 PSF "WIDTH OF TIMBERS(HORMONTAL);5 IN BATTER OF WALL:1 IN PER FC' **-*'-COMPUTED VALUES"" COEFFICIENT OF ACTIVE PRESSURE: 0.3024 ACTIVE THRVSST PER L.F.OF WALL; 933 LIS$ ACTIVE THRUST PER 8 FT SECTION OF WALL:7,484 LBS HEIGHT LENGTH LENGTH Or OF SI=FECTIVE OF EFFECTIVE FRICTION PASSIVE TOTAL TIE-HACK HEADER LENGTH DEADMAM HEAD RESISTANCE RESISTANCE RESISTANCE 0.0 4.0 3.40 4.0 1.44 4,048 953 5,000 1.6 8.0 ®.66 4.0 2.83 4,790 1,684 5,881 3.0 8.0 5.92 4.0 2.53 3,416 1,672 5,086 5.0 4.0 3.5 4.0 2.11 1,830 1,390 3,220 6.3 a 7.5 4.0 1.76 1,203 '1,135 9-001 TOTAL. . . . 22,347 SAFETY FACTOR 3.0 ********BILL OF MATERIALS FOR 8 FOOT SECTION OF 7.0 FOOT 111011 WALL"'"" OVANTITY SIZE LENGTH DESCRIPTION 50. FT. 7 5 X 8 4.0 TREATED TIMBER 70 20 3 X B 8.0 TREATED TIMBER 402 TOTAL .... 470 BOARD-FEET PER SQUARE FOOT OF WALL FACE 7.83 BOARD-FEET PER L. F. OF WALL 7.5 FEET HIQIH 58.75