Cantilever steel uniform beam is loaded by concentrated loads.
Given: l1=1,8l ; l2=1,3l; l3=1,3l; F1=-0,6P; F2=2,5P; M=-1,8Pl. Parameter of length l=50cm; parameter of load P=1,4kN. The beam is made of steel with yielding stress σY=280MPa; factor of safety n=1,3.
Find: the dimension (in mm) of cross section from strength calculation a = ?