Problem 3 A beam shown in the figure below is pre-tensioned using a 50 mm strand tendons placed variably throughout the

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Problem 3 A Beam Shown In The Figure Below Is Pre Tensioned Using A 50 Mm Strand Tendons Placed Variably Throughout The 1 (34.09 KiB) Viewed 26 times

Problem 3 A beam shown in the figure below is pre-tensioned using a 50 mm strand tendons placed variably throughout the length (Harped) with fpu=1860 MPa, fpy-0.85fpu, and the concrete capacity is f'c-45 MPa, fci-0.70fc. Design the section using an I-beam with Bf=1800 mm, hf=180 mm, Bw=200 mm, and carrying a load of w_LL-21 kN/m, w_(DL(assumed))=16 kN/m, w_SD=11 kN/m. The location of the centroid of the tendons is 250 mm from the bottom fiber, and the Prestressed losses = 17.5%. Determine the total height (mm) of the I-beam (Roundup, increment of 50 mm) considering midspan is critical. A hf e W 55 m Bf bw h B