The second Euler-Bernoulli hypothesis is satisfied if the rotation of the deformed crosssection θ is equal to the local slope of the bent middle axis dwdx \[\begin{align} \ep...The second Euler-Bernoulli hypothesis is satisfied if the rotation of the deformed crosssection θ is equal to the local slope of the bent middle axis dwdxϵzx=12(duzdx+duxdz)=12(dwdx+dudz)=12(dwdx−dwdx)=0