02218
A bridge is to be designed for its light weight and such that the maximum permissible deflection
is 8. In the primary design phase, designer simplifies the problem and considers it as a simply
supported circular rod of radius r and length L, with a transverse load F at midspan. With
elementary strength of material approach one can obtain the equation for deflection as
2026/7
11/25-tal a
86757-20 de
FL³
8=-
12Επι4
Find the material performance index and out of the given material select the best material based 2
2023/1terial bas
on performance index (neglect the cost effect)
flect the cost
Material
Mild Steel
Aluminium
Magnesium
Marks 8
23/1172
Young's Modulus (E in GPa)
200
70
45
Density (g/cm³)
7.85
1.74
O