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A pre-tensioned double-T-beam for a parking garage with harped tendon carry a superimposed sustained service live load of R/0

Civil Engineering

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A pre-tensioned double-T-beam for a parking garage with harped tendon carry a superimposed sustained service live load of R/0.72 plf and superimposed dead load of R/8 plf, on a R/13 ft simply supported span. Design this beam using the ACI 318 Building Code allowable stresses with ft = 12√fc'. The beam has no concrete topping. Beam is made of normal-weight concrete with fc' = 5,000 psi, and that the concrete strength f'ci at transfer is 75 percent of the cylinder strength. The time dependent losses of the initial pre-stress are 18 percent of the initial pre-stress, and that fpu = 270,000 psi for stress-relieved tendons.