2400 33RD ST CRANE LOADING 2018-01-02 MF Import

3. Calculate total live load acting on Or? pipe. WT = (w + LL)LSL Assuming truck travel transverse to pip . interline. LL = 64 L = Spread a = 3.67 feet Spread b = 2.83 feet B, = 3.08 feet, which is greater than Spread b, therefore SL = 2.83 feet WT = (1,920 + 64)x3.67x2.83 = 20,600 pounds Assuming truck travel parallel to pipe centerline. LL = 64 Spread a = 3.67 feet L = Spread b = 2.83 feet BC = 3.08 feet, which is less than Spread a, therefore SL = 3.08 feet WT = (1,020 + 64)x2.83x3.08=17,300 pounds WT Maximum = 20,600 pounds; and truck travel is transverse to pipe centerline 4. Calculate live load on pipe in pounds per linear foot. Ra = 3.08 feet Le = L+1.75(3/4Ro) Le = 3.67 + 1.75(.75x3.06) = 7.71 feet WL = WT/Le WL = 20,60017.71 = 2,672 pounds per linear foot EXAMPLE 3 Given: Same as Example 1, except minimum depth of fill is 4 feet. Find: The maximum live load on the pipe in pounds per linear foot. Solution: 1. Review project data A wall B 30-inch diameter circular concrete pipe has a wall thickness of 3.5 inches, therefore Bc is 3.08 feet and Ro is 3.08 foot. Height of earth cover is 4 feet. Use AASHTO LRFD Criteria with Select Granular Soil Fill. 2. Calculate average pressure intensity at the outside top of the pipe. From Table 3, the critical load, P, is 50,000 pounds from two single dual whee!s of two Alternate Load Configurations in the passing mode, and the Spread Area is: A = (Spread a)(Spread b) A = (1.67 + 4 + 1.15x4)(0.83 + 4 + 1.15x4) A = (10.27)(9.43) A = 96.85 .quare faet I.M.= 33(1-0.125H)/100 I.M.= 0.165 w = P(1 + I.M.)/A = 50,000(1 +.165)/96.85 w = 601lb/ft2 3. Calculate total live load acting on the pipe. WT = (w + LL)LSL Assuming!ruck travel transverse to pipe centerline. LL = 64 L = Spread a = 10,27 feet Spread b = 9.43 feet B, = 3.08 feet, which is less than Spread b, therefore SL = 3.08 feat WT = (601 + 64)x10.27x3.08 = 21,035 pounds Assuming truck travel parallel to pipe centerline LL = 64 Spread a = 10.27 feet L = Spread b = 9.43 feet BC = 3.08 feet, which is less than Spread a, therefore SL = 3.08 feet WT = (601 + 64)x9.43x3.08 = 19,315 pounds WT Maximum = 21,035 pounds; and truck travel is transverse to pipe centerline 4. Calculate live load on pipe in pounds per linear foot. Ra = 3.08 feet Le = L+1.75(3/4Ro) Le = 10.27 + 1.75(0.75x3.08) = 14.3 feet 8 1 American Concrete Pipe Associa0on • 222 W. Las Cob 1 • Irving, TX 75039 • (972) D06.7216 • FAX (972) 506.7682 Design Date