$1.$ Figure $1$ shows a three$-$span continuous beam subjected to uniformly distributed characteristic dead load $($Gk$)$ and characteristic imposed load $($Qk$).$ Sketch the load patterns for obtaining:

$($a$)$ Maximum span moment of BC$.$

$($b$)$ Maximum support moment at B$.$

$($c$)$ Maximum span moments of span AB Figure $1$ Three span continuous beam& CD