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The buried 36-inch reinforced concrete pipe (RCP) will get its most severe <br />loading under afully-loaded Caterpillar 735 articulated truck. According to the <br />"Caterpillar Performance Handbook", the maximum wheel load should not <br />exceed 23,860 pounds. <br />The installation was analyzed using the American Concrete Pipe Association's <br />"Concrete Pipe Design Manual." <br />Because the 36-inch RCP was placed on loose, granular bedding, a "type 3" <br />installation is assumed. Seven feet of cover with a unit weight of 120 #/f3, results <br />in a dead load of 4,841 #/linear foot of pipe. <br />Due to the 7 feet of cover, the wheel's load is spread over an area of 306 Z at the <br />top of the RCP; producing a live load of 225#/linear foot. <br />D-Load dead = 2105#/ft/ft <br />D-Load dead + dive = 2156 #/ft/ft <br />Please see attached calculations. <br />The introduction of the live load increases D-Load by 2.4%. Consequently, it <br />seems unlikely that loaded gravel trucks will lead to failure of the RCP. <br />