Q3: (Total = 15 marks) For the simply supported double-tee considered, calculate: i) The total time-dependent loss of pr

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Q3 Total 15 Marks For The Simply Supported Double Tee Considered Calculate I The Total Time Dependent Loss Of Pr 1 (25.93 KiB) Viewed 47 times

Q3: (Total = 15 marks) For the simply supported double-tee considered, calculate: i) The total time-dependent loss of pre-stress; The effective pre-stressed fic and Pe ii) Given: Live load = 40 psf Roof load - 30 psf Dead load - 50 psf Span - 45 feet = fe'i = 3500 psi fe- 5000 psi, 31-0.8 Aps-8 (0.153 in²) e 9.77 in. (all strands straight) fpu=270,000 psi fpy™ 0.90 fpu jacking stress - 200 ksi RH = 80% Eci™ 3590 ksi Ec- 4290 ksi Es=28,500 ksi Section Properties Ac=449 in²; Ic = 22,469 in; yb= 18 in.; yt- 6.23 in.; V/S = 1.5 in.; Top slab width= 140 in.; thickness=2 in.; depth = 24 in. and the neutral axis is 8 in. above the bottom standing point (10 marks) (5 marks)