Q$4($a$)$ If a steel frame is associated with wind load, discuss TIIREE. $(3)$ necessary considerations to conform the standard design practise.

$(6$ marks$)$

$($b$)$ Figure Q$4$ shows a section view of a multi$-$storcy building that imposed by vertical and horizontal loads. The diagonal steel bracers with size CHS $219\mathrm{.}110$ are provided to improve its stabillty, Given the following specifications:

Variable action for floor

Variable action for roof

Permanent action for floor

Permanent action for roof

Wind load

Yield strength of steel

$=1550kN$

$=202kN$

$=2300kN$

$=560kN$

$=463kN$

$=355$MPa

$($i$)$ Propose a suitable connection of bracing to beam$-$column. Use non$-$preloaded Class $8\mathrm{.}8$ M$24$ diameter bolt.

$(6$ marks$)$

$($ii$)$ Check the single shear of bolt.