Question

Assertion (A): The development length for HYSD Fe 415 bars is less than that for mild steel plain bars.

Reason (R) : The permissible bond stress for HYSD Fe 415 bars is more than that for mild steel plain bars.

• A. both A and R are true and R is the correct explanation of A
• B. both A and Rare true but R is not a correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is A both A and R are true and R is the correct explanation of A

The development length $L_d=\frac{\varphi {\sigma }_s}{4{\tau }_{bd}}$

Design bond stress $\left({\tau }_{bd}\right)$ in HYSD bars is 60% more than that for mild steel plain bars. So development length is less in HYSD bars.