PSAD SITUATION 12: Shear and Flexure of Continuous RC Beam

Описание: CELE Past Board Exam Problem
Situation 12: The reinforcement for negative moment of a continuous beam consists of the following:
Top bars = 8 – 20 mm diameter bars
Bottom bars = 4 – 20 mm diameter bars
Stirrups = 10 mm diameter bars
Material strength:
Concrete: fc’ = 27.5 MPa ρmax = 0.023
Reinforcing steel: fy = 413 MPa (main reinforcement)
fyv = 275 MPa
Dimensions: h1 = 100 mm; h2 = 400 mm; a = 45 mm; b = 350 mm
Clear concrete cover to stirrups = 50 mm
Shear strength provided by concrete: V_c=0.17√(f_c') bd
Shear strength provided by shear reinforcement:
V_s=(A_v f_yv d)/s
1. Compute the nominal shear capacity of the beam Vn (kN) if the stirrups are spaced at 100 mm center to center.
2. Find the nominal moment capacity (kN-m) of the beam at the supports.
3. Where shear is minimum, the stirrups are spaced at 250 mm center to center. Determine the shear strength (kN) provided by the stirrups.

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