Question

A continuous beam of span $12$ $m$ is subjected to uniformly distributed load. The minimum effective depth of beam required to check deflection of the beam, when modification factor for tension steel is $0.9$ is:

• A. $520$ $mm$
• B. $620$ $mm$
• C. $670$ $mm$
• D. $580$ $mm$

Answer 1

The correct option is B $620$ $mm$

For continuous slab, ${\left(\frac{l_0}{d}\right)}_{basic}=26$
Here, span $12m>10m$
${\left(\frac{l}{d}\right)}_{max}=26\times \frac{10}{12}\times 0.9$
$d_{min}=\frac{12000}{(26\times \frac{10}{12}\times 0.9)}=615.4mm$