Transcription of DESIGN FOR SHEAR2008
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DESIGN FOR SHEAR2008
Dr. Mohammed E. Haque, PE. Shear DESIGN Page 1 of 6. DESIGN FOR SHEAR. Max. Shear due to loads, Vu DESIGN Shear Capacity, Vn Where = DESIGN Shear Capacity, Vn = [ DESIGN Shear strength of concrete, Vc + DESIGN Shear strength of reinforcement , Vs ]. Vn = Vc + Vs Therefore, Vu [ Vc + Vs ]. Shear force that concrete can resist without web reinforcement , Vc (ACI Eq. ) Vc = 2 fc' (bw x d ). where fc' is in psi; bw and d are in inches 1 Vu bw 45 0 d 1 Section 1-1. d Fig. 1. Dr. Mohammed E. Haque, PE. Shear DESIGN Page 2 of 6. d s Number of stirrups crossing the crack, n=d/s Vu 45 0. Fig. 2. Vs = Av x fy x n Vs = Av x fy x d/s (ACI ).
Shear Design Page 5 of 6 Summary (Vertical Stirrup or Web Reinforcement Design) 1. Draw Shear, V u Diagram (Fig. 5) 2. Calculate V u at a distance d from the face of support 3. On the Vu diagram, identify locations where (1) Shear Reinforcement required, (2) where shear reinforcement not required, (3) where shear carried by stirrups, φV
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