Diagonal Cracking

5 important questions on Diagonal Cracking

Why is shear depth used to calculate the shear stress in a cracked reinforced concrete member?

To account for non-uniform variation of shear stress

If an element is subjected to pure shear, what is the relationship between the applied shear stress and principal tension stress?

Equal and opposite tension stress causing diagonal cracking

Why is the flexure-shear cracking stress lower than web shear cracking stress?

In web shear cracking stress crack suddenly forms due to shear
In flexure, cracks were already there because of bending. Shear cracking starts at the end of crack and high stress concentrations at crack ends make it easier for cracks to propagate.
Overall - already cracked in flexure, high stress concentrations
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Why is the shear stress at diagonal cracking lower in larger members?

- Large members form wider cracks
- Force/unit area it resists decreases but capacity increases

Why is shear stress at diagonal cracking lower is slender members?

Less concrete to resist shear, resistance relied on tension steel resulting in more steel strain and larger cracks

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