Question $4(12$ Marks$)-$ Write your answers on Sheet $20$ and $21.$

The truss is roller$-$supported at $A,$ pin$-$supported at $D,$ and subjected to the loading shown.

Member lengths:

$AI=5m$

$IH=5\mathrm{.}385m$

$BH=7\mathrm{.}810m$

$4\mathrm{.}1$ Determine the support reactions at A$.$ Write your answers on Sheet $20.$

$4\mathrm{.}2$ Identify if members $CD,CH,ED$ and$/$or $EG$ are zero$-$force members. Write your answers on Sheet $20.$

$4\mathrm{.}3$ Use the Method of Sections to determine the force in members $IH,BH$ and $BC$ and state if the members are in tension, compression or zero$-$force members. Write your answers on Sheet $21.$

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