3)

Determine the pipe profile (square pipe) needed for the most critical compression rod of the

attached grid when the material is $355 (Fe52). The material's Young's modulus is 210 GPa,

Shear modulus is 80 GPa and Poisson's ratio is 0.3. the length of each rod can be used as the

buckling length.

3,5 m

100 KN

3,5 m

90 KN

55 KN

3,5 m

I=

2,5 m