Rectangular hollow section $($RHS$,$ b$/$t $=35)$ lifting beam is attached to I beam columns. RHS beamis loaded by force $$F$$ vertically downwards from the lug with the load sequence described in figure above. The lug is fillet$-$welded to the RHS beam and the load is subjected to the hole of the lug via a shaft. Consider, what different failures mechanism might occur in the structure, i$.$e$.$ evaluate which structural details $($in the RHS beam $+$ lug$)$ should be analyzed in detail. The connection plates to the I beams and the shaft can be neglected in this evaluation. The material grade is S$420$ and the structure is used at room temperature $(+20\backslash$deg C$)$ and covered from rain.

i$)$ List the most important details of structure that should be carefully analyzed in the ultimate limit state.

ii$)$ Draw schematically the corresponding failure$/$fracture mode when they reach design limit state. The details under consideration are:

a$)$ Lifting lug including welds but without the shaft $(3$ failure modes at minimum$)$

b$)$ RHS beam without the connection plates to the I beams $(2$ failure modes at minimum$)$

$($You can also think, which serviceability limit states are needed in design and analysis of the beam$)$

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