$3.$ Using the Aldred Structural drawings $($on D$2$L$)$:

a$.$ What is the beam size on the roof level along grid $5$ between grids $\backslash ($ A $\backslash$& B $\backslash )?$

b$.$ What is the section detail number of this overhanging beam?

c$.$ Considering the section detail, what is the unsupported length of this beam? Which "zone" of the beam would be the most critical to check? Explain why?

d$.$ Show that the beam is adequate in shear with the depth change shown $500$ mm to the right of grid $\backslash ($ A $\backslash )$ in the section detail.

BONUS $(2$ marks$)$: If you were using very deep trusses $(1200$ mm $)$ to support negative moments in an architecturally exposed area and your joists are very shallow $(300$ deep$)$ it is difficult to brace the bottom chord of these big trusses. Can you suggest how the engineers could brace the bottom chord of the trusses to aid in lateral stability? Remember this area is architecturally exposed $-$ it has to look good!