Cantilever steel uniform beam is loaded by concentrated loads.
Given: l1=1,2l ; l2=2l; l3=1,9l; F1=1,3P; F2=2,4P; M=0,7Pl. Parameter of length l=50cm; parameter of load P=2,3kN. The beam is made of steel with yielding stress σY=240MPa; factor of safety n=1,7.
Find: the dimension (in mm) of cross section from strength calculation a = ?