Problem 2 The section of a prestressed double-tee concrete floor joist is shown in the figure. Assume that there is a pr

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Problem 2 The Section Of A Prestressed Double Tee Concrete Floor Joist Is Shown In The Figure Assume That There Is A Pr 1 (29.21 KiB) Viewed 18 times

Problem 2 The section of a prestressed double-tee concrete floor joist is shown in the figure. Assume that there is a prestress loss of 15% at service loads. Unit weight of concrete is 24.50 kN/m3 and fc = 42 MPa The properties of the double-tee sections are A = 220,000 mm2 L = 10.8 m 1 = 1890(106) mm4 Service loads on floor; Dead load 3.5 kPa Live load = 7.5 kPa Determine the prestressing force (kN) at the final stage, considering the bottom fiber of the midspan not to exceed the modulus of rupture. 2500 mm TI 75 mm 90 mm 270 mm