My$,$Ed $=(($h$/2)+100)$ x R$2=29\mathrm{.}6$kNm

Mz$,$Ed $=(($tw$/2)+100)$ x $($R$1$ R$3)=0\mathrm{.}9$kNm

These moments are distributed between the column lengths above and

below level $2$ in proportion to their bending stiffness $($EI$/$L$),$ therefore

moments acting on lower column are:

My$,$Ed $=$ My$,$Ed X L$2-3/($L$2-3+$ L$1-2)=29\mathrm{.}6$ x $3/(3+5)=11\mathrm{.}3$kNm

Mz$,$Ed $=$ Mz$,$Ed X L$2-3/($L$2-3+$ L$1-2)=0\mathrm{.}9$ x $3/(3+5)=0\mathrm{.}3$kNm

It is UK practice; if the stiffness of the column lengths $<mtext></mtext><mn>1</mn><mn>.</mn><mn>5</mn>$ tim