Question

A simply supported rectangular beam of span 20.0 m is subjected to UDL. The minimum effective depth required to check deflection of this beam, when modification factor for tension and compression are 0.9 and 1.1 respectively, will be

• A. 2.0 m
• B. 1.8m
• C. 1.3 m
• D. 1.0 m

Answer 1

The correct option is A 2.0 m

Span to effective depth ratio

$=20\times \left(\frac{10}{20}\right)=10$

Span to effective depth ratio with modification factors $=10\times 0.9\times 1.1=9.9$

$\therefore \text{Effective depth}=\frac{20}{9.9}=2.02m$