CONCRETE PIPE Load Assumptions The maximum highway wheel loads generally considered for design are those specified by the Canadian Highway Bridge Design Code (CHBDC). Here, an idealized five-axle truck (see following page) represents the worst-case loading scenario, including wheel spacings, weight distribution, and clearance envelope. Wheel and axle loads are shown in terms of W and are shown for the CL-625 Truck. For provinces outside Ontario, a CL-800 (800 kN) truck is utilized. For the purposes of PipeCAR and PipePAC, the above noted loading relates to a single axle load of 224 kN and a dual axle load of 160 kN. At Lafarge, our steel reinforcement designs aren’t set in stone. While the majority of our product offering is standardized, we have the in-house engineering expertise and manufacturing capability to meet most any loading condition or unique project requirement. Wheel Load Distribution Through Fill2 As per the CHBDC, when the depth of fill over a structure is 0.60 m or more, wheel loads shall be uniformly distributed at the surface of the structure over a rectangle, the sides of which are equal to the footprint of the wheel of the CL-W Truck plus 1.75 times the depth of fill. When distributed wheel loads from two or more wheels overlap, the total load of those wheels shall be uniformly distributed over the smallest rectangle that includes their individual areas, but the total width of distribution shall not exceed the total width of the structure supporting the fill. When the depth of fill over a structure is less than 0.60 m, no distribution beyond the footprints of the wheels shall be considered. 2 CAN/CSA S606, Canadian Highway Bridge Design Code, Canadian Standards Association and Standards Council of Canada, 2006, page 245. PAGE 32 LAFARGE PIPE eMANUAL