A 10m long prestressing bed is used to cast beams of 2.3 m each. A schematic representation of the bed is given in the following figure. The continuous prestressing reinforced is pulled at the end 'Y' of the bed through a distance of 20 mm to introduce the required 'prestress' before the concrete is cast. After the concrete has hardened, the prestressing reinforcement is cut at points A,B,C,D and EAssume that the prestress is introduced without eccentricity, what is the loss in prestress on account of elastic deformation of concrete.Assume Es=200000N/mm2,Ec=20000N/mm2, Area of prestressing reinforcement is 500 mm2, size of beam = 200 mm (b) x 400 mm (h)

A 10m long prestressing bed is used to cast beams of 2.3 m each. A sch

1.	A 10m long prestressing bed is used to cast beams of 2.3 m each. A schematic representation of the bed is given in the following figure. The continuous prestressing reinforced is pulled at the end 'Y' of the bed through a distance of 20 mm to introduce the required 'prestress' before the concrete is cast. After the concrete has hardened, the prestressing reinforcement is cut at points A,B,C,D and EAssume that the prestress is introduced without eccentricity, what is the loss in prestress on account of elastic deformation of concrete.Assume Es=200000N/mm2,Ec=20000N/mm2, Area of prestressing reinforcement is 500 mm2, size of beam = 200 mm (b) x 400 mm (h)
Answer» A 10m long prestressing bed is used to cast beams of 2.3 m each. A schematic representation of the bed is given in the following figure. The continuous prestressing reinforced is pulled at the end 'Y' of the bed through a distance of 20 mm to introduce the required 'prestress' before the concrete is cast. After the concrete has hardened, the prestressing reinforcement is cut at points A,B,C,D and E Assume that the prestress is introduced without eccentricity, what is the loss in prestress on account of elastic deformation of concrete.Assume $E_{s} = 200000 N / m m^{2}, E_{c} = 20000 N / m m^{2},$ Area of prestressing reinforcement is 500 mm $^{2}$ , size of beam = 200 mm (b) x 400 mm (h)