PROBLEM NO$.1$:

$($a$)$ Determine the tensile development length required

for the uncoated $25mm$ bars shown if normal$-$weight

concrete is used and the bars are straight. Use ACl

Equation $12-1$ and compute the value of $K_{tr}.f{c}^{\text{'}}=28$

MPa and fy

$=420$MPa.

$($b$)$ Repeat part $($a$)$ if $180$@ hooks are used. Assume the

side, top, and bottom cover in all cases to be at least

$115mm.$