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Q: The absence of a bond between reinforcing steel and surrounding concrete in a RCC beam will result in.
  • A. linear variation of axial stress in a straight bar.
  • B. parabolic variation of axial stress in a straight bar.
  • C. constant stress at all points in a straight bar.
  • D. zero axial stress at all points in a straight bar
Correct Answer: Option C - Bond between steel and concrete–The term bond refers to the adhesion between concrete and steel which resist the slipping of steel bar from the concrete. → The bond resistance in reinforced concrete is obtained by following mechanism– • Chemical adhesion • Frictional resistance • Gripping action • Mechanical interlock. → In the absence of bond, the reinforcing bar in concrete is just like a string only wherein the stress is the constant at all points on the string or constant stress at all points in like a straight bar.
C. Bond between steel and concrete–The term bond refers to the adhesion between concrete and steel which resist the slipping of steel bar from the concrete. → The bond resistance in reinforced concrete is obtained by following mechanism– • Chemical adhesion • Frictional resistance • Gripping action • Mechanical interlock. → In the absence of bond, the reinforcing bar in concrete is just like a string only wherein the stress is the constant at all points on the string or constant stress at all points in like a straight bar.

Explanations:

Bond between steel and concrete–The term bond refers to the adhesion between concrete and steel which resist the slipping of steel bar from the concrete. → The bond resistance in reinforced concrete is obtained by following mechanism– • Chemical adhesion • Frictional resistance • Gripping action • Mechanical interlock. → In the absence of bond, the reinforcing bar in concrete is just like a string only wherein the stress is the constant at all points on the string or constant stress at all points in like a straight bar.