This thread is about the standard shear diagonal cracks and not study of one occurring at midspan so let me post this separately to avoid confusion.
Please post all the shear diagonal cracks you have ever seen.
Why does these occur less frequency than flexurable cracks?
Now about design...
In shear and moment diagrams of reinforced concrete beams... you have continuous shear from midspan to support as in...
in actual...
You see, in midspan.. there is more strength in the beam... and even if shear forms.. it would be more vertical or more of flexural failure... therefore can...
