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Spacing Limits for shear

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When shear reinforcement is required, i.e., V(u) > .5*phi*V(c), as 
required by Sect., the spacing limits that you referenced are 

The reason for this is for any 45 deg. shear crack to have at least one 
shear reinforcing bar crossing it.  Note that the spacing for reinforced 
concrete is related to the "d" distance, not the "h" dimension.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona