Please help with Mechanics Engineering (see image below) Lets design a concrete

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Please help with Mechanics Engineering (see image below)

Lets design a concrete bridge. Design a series of closely spaced parallel box beams that will support an asphalt road surface over a 10 foot wide. 40 . The hollow box beams are made of concrete and No 8 steel rods (1 inch dia). Maximum beam height is 30 inches. Minimum concrete thickness is 2 inches and in regions where steel rods are used. Concrete cover over the steel rods must be at least 2 inches thick . the external bridge loading is 500 lbs per square foot. Assume the asphalt surface is 2 inches thick and weights 30 lbs per square foot. Also assume that the asphalt surface is tree to slide (not attached) over the box beams. Other assumptions you can make: The weight of the bridge itself must be considered. Use the 'civil engineering' method to calculate all properties of the beams. Specify the number of beams, their dimensions and the location and number of steel bars in each box beams. Support your design with appropriate calculations.

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