b'Design Example 5Calculate the Foundation Load and Determine Pier SpacingThree Story Office Building Thethreestorystructurehassettledtowardthecorner.Thelargestelevationlosswas Dead Load =measuredat1-1/2inches. 4,700 lb/ftTheengineerrequesteda Live Load =pierdesignandplacement 1,800 lb/ftPerm. Soil Load =proposal usingasteelpier 360 lb/ftsystemtosupportthe PLAN VIEW Temp. Soil Load =structureandrecoverlost 980 lb/ftelevation. LIFT LOAD = Theengineer requireda 7,840 lb / ftFracturefactorofsafetyofatleast 30 ft2.0. Thefoundationconsistsofan18tallx28widereinforcedfootingwitha10thickx3-0tallcastconcretestemwall. 52 ft(Footing toe = 8)The first Dead Load = 7,000 lb/ftfloorslabis6thick Live Load = 2,600 lb/ftconcrete. Perm. Soil Load = 360 lb/ft Theupperfloorsare Temp. Soil Load = 980 lb/ftconstructed of lightweight LIFT LOAD = 10,940 lb / ftconcreteandtheroof Figure 8.Sketch for Example 5.consistsofmulti-layertarand gravel over an insulated metal roof deck. 3. Permanent Soil Load on Footing Toe:Table 8 is The exterior walls are 30 feet tall and consist of usedtoestimatethe permanentsoilloadontheheavyweightconcreteblocksthatarefilledand footing toes.There are 8 inches of footing toe inside,reinforced.Theoutersurfacehasa1-1/2inch and 8inches outside,ofthestemwallthat arethick simulated stucco covering.Inside the walls subjected to a permanent soil load.The soil height isconsist of steel studs, insulation, and pre-finished assumed to be 2-1/2 feet above the top of the footing.drywall. Referring to Table 8, notice that there is no weight The engineer has calculated the dead load at 7,000 provided for a soil height of 2-1/2 feet. The solutionlb/lf on the heavy, load bearing side and 4,700 lb/lf is to use the permanent soil load for 2 feet and thenon the adjacent wall.The live loads are estimated add an additional soil load for additional 1/2 foot.at 2,600 lb/lf and 1,800 lb/lf respectfully. Lookingat Table 8 (A portion is below), the weight1.Engineer Specified Loads: for two feet of soil per inch of footing toe is 18 lb/in.Working Load (P W ) = Dead Load + Live Load Estimating the additional weight for the 1/2 foot ofSide 1 - P W 1 = 7,000 + 2,600 = 9,600 lb/lf soil is determined by dividing the weight of 2 feet ofsoilby4toarriveattheweight for1/2footofSide 2 - P W 2 = 4,700 + 1,800 = 6,500 lb/lf permanent soil load. This calculation determines an2. Adjust the Working Loads due to Soil Loads: additionalweightof4-1/2lb/inof footing toe.Itwasnoticedwhenreadingthroughthe project Therefore, the estimated permanent soil load per inchinformation provided that the engineer did not include of footing toe is:a valueforthe temporarysoilloadin theworking W toe= 18 + (18/4) lb/ft = 22-1/2 lb/in of footing toe.load calculations.A review of Table 8 presented inW d = 22-1/2 lb/in x 8 in x 2 toes = 360 lb/ftChapter 6providessoilload data that we need to Table 8. Estimated Soil Loads on Footingsinclude with the Working Permanent Soil Load on a Footing ToeW dLoad specification.Itisnecessaryto Soil Height Against Wall 2 4 6 7 8 9 10consider the permanent Soil Load per inch of Footing Width 18 lb 37 lb 55 lb 64 lb 73 lb 83 lb 92 lband temporarysoil To determine the permanent soil load on a footing toe, multiply the actual width of the footing toe (in inches) byloadswhenastructure the unit weight shown above for the soil height against the wall.must be lifted.ECP Technical Design Manual -Steel Pier Design Examples2021 Earth Contact Products, L.L.C.2021-09 Chapter 7 - Page 139 All rights reserved'