Just question $2$ please

The two$-$span continuous beam shown below is statically indeterminate $(DSI=1).$ A uniform

distributed load is applied across both spans, for which an indeterminate structural analysis

reveals the reactions shown below. The steel beam $(E=29000$ksi has second moment of

area $I=900$ inch ${?}^4.$

In the following problems, you will use graphical integration of the virtual work equations

to compute the rotation at $B$ using several virtual force sytems.

It is best to develop the real curvature diagram by cantilevered parts at the point where you

are computing a deflection or rotation.

Develop the real curvature diagram for the beam by cantilevered parts at $B.$

In the following problems, you will re$-$use the areas and centroid locations from the previous

problem. In each of the following problems, only the virtual moment diagram will change

and you should calculate the same value for the rotation at $B.$

Answer: ${}_B=0\mathrm{.}00013241$rad$$

Make the beam determinate by removing the support at $C($reaction is zero$)$ and apply

a unit virtual moment at $B.$

Draw the virtual moment diagram then calculate the rotation at $B.$