Multiple choice

Assuming concrete below the neutral axis to be cracked, the shear stress across the depth of a singlyreinforce rectangular beam section

  1. increases parabolically to the neutral axis and then drops suddently to zero value.

  2. increases parabolically to the neutral axis and then remains constant over the remaining depth

  3. increases linearly to the neutral axis and then remains constant up to the tension steel

  4. increases parabolically to the neutral axis and then remains constant up to the tension steel.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Concrete is assumed as elastic material in the analysis and shear stress of the concrete varies as parabolically and maximum at neutral axis and for zero at top of the section. Since, there is crack below the neutral axis and steel present at the bottom of section so a constant stress up to steel (tension).

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