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You must build a bridge across a 20 foot wide gully. The bridge is 4 foot wide and will be constructed of 4x8 foot plywood sheets placed on top of two composite beams that are about 4 feet apart. Design the bridge so that the two composite beams take all the load, which is equivalent to 500 lbs/ft distributed over the length of each composite beam. The plywood lays on the composite beams, but is not attached (cheap bridge).
1. Concrete Bridge: Design a series of closely spaced parallel box beams that will support an asphalt road surface over a 10 foot wide, 40 foot long span. The hollow box beams are made of concrete and No 9 steel rods (1.125 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 weighs 30 lbs per square foot. Also assume that the asphalt surface is free to slide (not attached) over the box beams.
Three parallel rural routes connect two cities A and B. Traffic on these routes mainly consists of heavy trucks for a logging company, and passenger vehicle flow can be neglected. The performance functions of these three routes are
A 3-ft diameter column with weight of 150 kg is placed on top of 1 m thick aggregate layer. The soil beneath the aggregate layer is sand. The friction angle of the aggregate is 36 degrees and the unit weight is 22 lb/ft3. What is the pressure acti..
Submit the CostWorks format, including all the data and calculations used to estimate the bare cost of steel doors.
What is the percentage error in the bulk unit weight if the soil is the percentage error in the bulk unit weight if the soil is 95% saturated but assumed to be 100% saturated?
A triaxial test was performed on a dry, cohesionless soil under confining pressure of 144 kN/m^2. If the sample failed when the deviator stress reached 395.8 kN/m^2, determine the soil's angle of internal friction.
In New york you had a balloon inflated with helium (He) and you measured its temperature, which was 89.6 degree F, and its pressure, which was 100,000 N/m^2. In Colorado, however, you noticed that the temperature of the He was 69.8 degree F and th..
Determine the bounce height h2 of the ball (a) if υ0 is constant and (b) if an upward elevator acceleration α = g/4, begins at the instant the ball is released. The coefficient of restitution for the impact is e.
To remove a nail, a small block of wood is placed under a crowbar, and a horizontal force P is applied as shown. Knowing that the maximum vertical force needed to extract the nail is 2600 N and that the horizontal force P is not to exceed 290 N, d..
Properties of frozen tissues have been measured as part of understanding the response of tissue to cryopreservation. In one set of experiments, frozen bovine carotid arteries were tested in uniaxial tension.
the trailer has a mass of 580 kg and a mass center at g. the spool has a mass of 200 kg with a mass center at o and a
Two wells had been drilled on 40-acre spacing. Well 1 is injectionand Well 2 is producing well. Down hole injection pressure is 8500psi, and bottom hole pressure in producing well is 2400 psi.
A completely mixed retention basin is used to treat an industrial waste water consisting of a non-conservative pollutant, using a reaction that destroys the pollutant according to first-order reaction kinetics, with k = 0.216/day.
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