Question

A steel beam is subjected to a bending moment of \(60\,\mathrm{kN\!-\!m}\). If the allowable bending stress is \(150\,\mathrm{MPa}\), the required section modulus is

• A. \(2\times10^5\,\mathrm{mm^3}\)
• B. \(3\times10^5\,\mathrm{mm^3}\)
• C. \(4\times10^5\,\mathrm{mm^3}\)
• D. \(5\times10^5\,\mathrm{mm^3}\)

Hint:

For bending, \[ \boxed{ Z=\frac{M}{\sigma_b}. } \] Always convert the bending moment into \(\mathrm{N\,mm}\).

Answer 1

The Correct Option is C