Consider a Jointed Dowel Reinforced Concrete Pavement (JDRCP), consisting of slabs 25 cm thick and 3.6...

 

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Consider a Jointed Dowel Reinforced Concrete Pavement (JDRCP), consisting of slabs 25 cm thick and 3.6 m wide, resting on a subgrade with a modulus of subgrade reaction of 50 MPa/m. The dowel bars have a diameter of 30 mm. The center-to- center spacing between dowel bars is 0.3 m. A wheel load carrying 60 kN is located on the top of a dowel bar that is located 2.1 m from the left edge of the slab. The pavement layout and the loading location are demonstrated in the following figure (Figure 2-1). Answer the following questions: Compute the load carried by EACH dowel bar, given that the elastic modular (E) for the Portland concrete is 28,000 MPa and that the Poisson's ratio of concrete is 0.15. Here, we assume that the wheel exerts a point load of 60 kN, that the load transfer across the slab is 50/50, and that the distribution of load varies linearly with respect to the distance from the centerline of the load. Draw a diagram to show the load carried by EACH dowel bar as you calculated. 1) 2) Note: the radius of relative stiffness can be calculated as: E h³ 12(1 −µ²) k l = 0.25m - 0.3m 0.3m 1/4 2.1 m 3.6m 60 KN 0.3m Figure 2-1: The layout of a concrete slab and dowel bars for a JDRCP Consider a Jointed Dowel Reinforced Concrete Pavement (JDRCP), consisting of slabs 25 cm thick and 3.6 m wide, resting on a subgrade with a modulus of subgrade reaction of 50 MPa/m. The dowel bars have a diameter of 30 mm. The center-to- center spacing between dowel bars is 0.3 m. A wheel load carrying 60 kN is located on the top of a dowel bar that is located 2.1 m from the left edge of the slab. The pavement layout and the loading location are demonstrated in the following figure (Figure 2-1). Answer the following questions: Compute the load carried by EACH dowel bar, given that the elastic modular (E) for the Portland concrete is 28,000 MPa and that the Poisson's ratio of concrete is 0.15. Here, we assume that the wheel exerts a point load of 60 kN, that the load transfer across the slab is 50/50, and that the distribution of load varies linearly with respect to the distance from the centerline of the load. Draw a diagram to show the load carried by EACH dowel bar as you calculated. 1) 2) Note: the radius of relative stiffness can be calculated as: E h³ 12(1 −µ²) k l = 0.25m - 0.3m 0.3m 1/4 2.1 m 3.6m 60 KN 0.3m Figure 2-1: The layout of a concrete slab and dowel bars for a JDRCP

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To calculate the load carried by each dowel bar we first need to determine the radius of relative st... View the full answer