Correct Answer - Option 2 : m = 280/3 C
Concept:
In WSM:
Modular ratio, \({\rm{m}} = \frac{{280}}{{3{{\rm{σ }}_{{\rm{cbc}}}}}}\)
Where \({σ _{cbc}}\;\) is permissible compressive stress.
In LSM:
Modular ratio, \({\rm{m}} = \frac{{{{\rm{E}}_{{\rm{st}}}}}}{{{{\rm{E}}_{\rm{c}}}}}\)
Where Est and Ec are modulus of elasticity of steel and concrete respectively.
Calculation:
Given;
σcbc = C
So, the modular ratio;
\({\rm{m}} = \frac{{280}}{{3C}}\)