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SHEAR in CONCRETE 
December 14, 2010 
By Refugio M. Rochin
First Observations 
• Concrete Usually Shears at first 
yields at 45o angles 
• For Beams with Multiple Shear 
Reinforcing Rings, elongation of 
shear rings away from pivot 
point (ie fixity), is generally 
greater, thus the concrete 
cracking angle is usually less 
than 45o. 
• q flattens to 25o to 30o 
• f = 0.6 tends to lean towards 
over-reinforcement
Elastic Beam Model
Beam-Column Joint Considerations

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12 shear in concrete

  • 1. SHEAR in CONCRETE December 14, 2010 By Refugio M. Rochin
  • 2. First Observations • Concrete Usually Shears at first yields at 45o angles • For Beams with Multiple Shear Reinforcing Rings, elongation of shear rings away from pivot point (ie fixity), is generally greater, thus the concrete cracking angle is usually less than 45o. • q flattens to 25o to 30o • f = 0.6 tends to lean towards over-reinforcement