Which of the following beam section moduli would be the most

Which of the following beam section moduli would be the most economical? circle your choice. If the beam you were designing (for example: 16\' span, uniformly distributed load) met the allowable bending and shear stress but not the deflection, what options would you have and why?

Solution

1) From the strength criteria point of view, the section with more section modulus will be having higher strength and hence we choose the higher value of section moduli i.e., 150 . But from the economic point of view in which the cost is the criteria we will have a balance i.e., optimisation and accordingly we choose the value

2) 1) higher values of E and I can resist the deflection

2) simply supported beam(ss beam ) is preffered to cantilever beam as ss beam can resist the max deflection when compared to that of cantilever