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RETAINING WALL UNITS <br /> STRUCTURAL PROPERTIES: <br /> N is the normal force [or factored normal load] on the base unit <br /> The default leveling pad to base unit shear is 0.8 tan(cp) [AASHTO 10.6.3.4] or <br /> may be the manufacturer supplied data. cp is assumed to be 40 degrees for a stone leveling pad. <br /> Note: Calculations and quantities are for PRELIMINARY ANALYTICAL USE ONLY and MUST NOT be used for final <br /> n or construction without the independent review, verification, and approval by a qualified professional engineer. <br /> UltraWall 6.0.22298.930 5 <br />