Given Data :- Ap = 1777 mm 2. As 2 = 500 mm A's = 314 mm 2 fpk = 1700 MPa fp 0,1k 1530 MPa fy = 400 MPa Pre tensioned 900x500 mm beam with C60/75 concrete, goox 500 mr Solution :- For C60/75 Concrete - 2=0.8 1 (fck-50) 450 - n = 1 - (fek-50) 21 x = 250 = 0.8 (60-50) = 0.778 450 0.96 1- (60-50) (Ap. fpo,1,k/83) + A5. fy .b. (n.fed) 250 - As-fy = x = 1777 x 1530/1.15 + 500400 - 814400 = 108.83 mm - 0.778 x 500 x (0.9660) M = Ap. fpo.sk. (dp-2.x) + Ag.fy. (d-2.x) + A's. fy. (2.x_d') 2 2 2 = 1777 x1530 x (750 - 0.778 108.83 1.15 2 M = 1836.71 KN.M + 314x400x + 500 x 400 x = 850 0.778x108.83 - 2 0.778x108.83 2 25 Answer Teacher's Signatuu