Question

1. (a) What is the design shear strength of the beam shown if fc' = 21 MPa; fy = 350 MPa? No shear reinforcing is provided? 4020 425 500 300 (b) What is the design shear strength of the beams shown if fc'= 21 MPa, fy = 350 MPa? Shear reinforcing is provided? 1126 012@ 150mm 675 750 010@150mm 550 800 163 63 1. 450 L 200 - 010@150mm | 300-

Answer 1

D a) Given, P = 21 MPa fy= 250 MPa b- 300 MM ძ— Mys ოო No sheas reinfoscement provided as resisted by concrete itself Shear strength corresponds to sheas resisted by concrete Ve= SF bd = 152/ x300x225 = 97379.1 N = 97.38 kN Design Shear strength, dh = 0V6 = 0.75X97.38 = 73.035 KN b) i) b=450mm d= 675 mm 012 @ 150mm - Shear reinfoscement V = (Netve) Ver / SF bd 1 JPix 450 x 675 – 831992.89 N = 231.993kN An end 2x5(10)® x 350x 675 - 356076 N 356.076 KN Design Shear strengkh, Ovn = 0(VC+V6) = 0.75 x (231.993+356.076) = 441.052 kN

b) ii) be=400 mm bw = 185mm d=737mm Sheas reinforcement - 010@ 150 mm Vn = (vc +Vs) V = n se bude 'MEI XIES*137= 70361.63 N = 70.36 kN Vs = Avlyd, exFlo** 35ox 737 - 269987.67N 150 = 269.99 kN Design Shear strength, 6V = 0.75 (70.36 +869.99) — 255.263N 00 MM b)ii) bw= 300 mm d = 685 mm Sheas seinforcement odio@150 mm K= nogle band = WNE 300x605 = 14320549N = 143.21 kN W = Avfyd - 4x560**350x625 - 228958.3N 150 = 298.96 kN Design sheas strength, OVn=0.75 (143.814 228.96) = 279.128 kn