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ADaPT Engineering, Inc. <br />Western Wireless Corporation <br />ADaPTJob No, WA98-992 <br />April I, 1998 <br />Page 6 <br />Table I <br />Allowable End Bearing Capacity <br />Depth (feet) <br />Allowable Bearing Capacity Limiting Point Resistance. (tai) <br />15-29 <br />6 5 D/D I 35 'rSF <br />Motes: D = the embedment depth (in feet) into the bearing layer. <br />D = pier diameter (feet). <br />Frictional Capacities: For frictions! resistance of the drilled piers, acting both downward and in uplift, we <br />recommend using the allowabie skin friction value listed in 'fable 2. We recommend that frictional <br />resistance be neglected in the uppermost 2 feet below the ground surface. The allowable skin friction <br />value presented includes a safety factor of 1.5. <br />Table 2 <br />Allowable Skin Friction Capacities <br />Depth (feet) Allowable Skin Friction (ts f) <br />0-2 0.0 <br />2-7 0.50 <br />7-29 0.70 <br />Lateral Capacities: For design against lateral forces acting against the drilled pier, two methods arc <br />typically used. The parameter used to select the appropriate design method is the length to pier stiffness <br />ratio L/T, where 1. is the pier length in inches, and T is the relative stiffness factor. The relative stiffness <br />factor (T) should be computed by: <br />T= <br />I` El a' <br />n�, <br />where E = modulus of elasticity (psi) <br />I = moment of inertia (in') <br />nh = constant of horizontal subgmde reaction (pa) <br />