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07/A9/199F, 10:35 6124041947 BENEFITS DESIGN GRP PAGE 04 <br /> 07.05.1986 <br /> 07:51:19 <br /> """"DESIGN OF TREATED TIMBER RETAINING WALL`"'*"•• <br /> THIS PROGRAM IS FOR OGSIGNING•A RESTRAINING SYSTEM FOR A TREATED TIMBER RLTAININQ <br /> WALL WHICH USES PASSIVE PRESSURE TO SUPPORT THE ACTIVE EARTH PRESSURE. <br /> THE ACTIVE AND PASSIVE EARTH PKESSUnES ARE DERIVED BY USING CGtJLOMB'S EQVATION. <br /> THE BACKFILL 18 ASSUMED*TO BE WELL DRAINED ORANULAR MATERIAL. <br /> THIS TYPE OF WALL U9E6TIMBER WHICH EXTEND HORIZONTALLY INTO THE BACKFILL OF THE <br /> WALL,THESE MF-MBE143 ARE CALLED HEADERS. <br /> THE HEADERS ARE PEnPENDICULAR TO TI IE FACE OF THE WALL. THE HEADERS ARE <br /> CONNECTED TO OTHER MEMBERS, IN THE 6ACKFILL CALLED DEADMEM. <br /> THE DEADMEM ARE PARALLEL TO THE FACE OF THE WALL. <br /> *'--*GIVEN INFORMATION•'•••••• <br /> 'H9IGi4T OF WALL:4.4)FT. <br /> 'WEIGHT OF SOIL:110 PCF *ANGLE OF INTERNAL FRICTION:30° <br /> 'ANGLE OF SLOPING BACKFILL: 18.40 *SURCHARGE:0 PSF <br /> 'WIDTH OF TIMBERS(HORIZONTAL)-,6 IN BATTER OF WALL; 1 IN PER FT <br /> ,,•'••••COMPUTED VALUES••••••• <br /> COEFFICIENT OF ACTIVE PRESSURE: 0.3848 <br /> ACTIVE THRUSST PER L.F.OF WALL: 339 LBS <br /> ACTIVE TMTIUST PER 8 FT aEGTION OF WALL: 2,705 LBB <br /> HEIGHT LENGTH LENGTH <br /> OF OF EFFECTIVE OF EFFECTIVE FRICTION PASSIVE TOTAL <br /> TIC-LACK HEADER LENGTH DEADMAM HEAD AEGISTANCE AESISTANCE RESISTANCE <br /> 0.0 4.0 3.40 4.0 1.44 2,430 983 3.382 <br /> 1.5 8.0 6.66 4.0 2.85 2,3715 1,884 4,280 <br /> 3.0 8.0 8.92 4.0 1.73 1,071 111515 2,226 <br /> TOTAL. ... 9,968 <br /> SAFETY FACTOR 3.6 <br /> """"'BILL OF MATERIALS FQR 8 FOOT SECTION OF 7.0 FOOT HIGH WALL----- <br /> QUANTITY SIZE LENGTH DESCRIPTION BD.FT. <br /> 4 6 X 5 4.0 TREATED TIMBER 48 <br /> 1f 6 X 6 9.0 TREATED TIMBER 264 <br /> TOTAL .... 312 <br /> BOARD-FEET PER SOUARE FOOT OF WALL FACE 9.76 <br /> BOARD-FEET PER L. F. OF WALL • FEET HIGH <br />