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Q.1 A crane having an approximate trapezoidal c/s is shown in fig. It is made of plain carbon steel 45C8 $(Syt=380 \ N/mm^2$) and the FOS is 3.5. Determine the load carrying capacity of hook.
$\sigma_{max}$ =$\frac{Syt}{FOS}$ = $\frac{380}{3.5} = 108.57 \ N/mm^2$
$\;$(I) PSG 6.3
$r_{n}$ = $\frac{(\frac{b_{i}+b_{o}}{2})\;h}{(\frac{b_{i}.r_{o}-b_{o}.r_{i}}{h})\;ln\;(\frac{r_{o}}{r_{i}})-(b_{i}-b_{o})}$ …