Consider a double$-$T$-$shaped cross$-$section with an overall width $b=143mm,$ an overall height $h=88mm,$ a flange thickness of $s=10\mathrm{.}2mm,$ and a web thickness of $t=9\mathrm{.}3mm.$ A concentrated load is acting at the left end of the flange in vertical direction, causing a twist of the cross$-$section. Determine the maximum value of this load in kN $($to $2$ decimal places$),$ if the maximum shear stress from torsion is limited to $=11\mathrm{.}6\frac{N}{m}{m}^2.$

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