Question

Tie bars of 12 mm diameter are to be provided in a concrete pavement slab. The working tensile stress of the tie bars is 230 MPa, the average bond strength between a tie bar and concrete is 2 MPa, and the joint gap between the slab is 10 mm. Ignoring the loss of bond and the tolerance factor, the design length of the tie bar (in mm, round off to the nearest integer) is_____

• A. 700

Answer 1

The correct option is A 700
Given,

$d=12mm$
${\sigma }_{st}=230MPa=230N/m{m}^2$
$S_b=2MPa=2N/{mm}^2$
$t=10mm$

$\text{Length of tie bar}=t+\frac{D{\sigma }_{st}}{2\times S_b}$
$=10+\frac{12\times 230}{2\times 2}$
$=10+690$
$=700mm$