Question $3$

$($b$)$

$($i$)$ Determine the reactions at the supports at locations A and D of the timber roof truss shown in Figure Q$3$b$.$

$[2]$

$($ii$)$ Determine the forces in members $AB,BC,BD,AC$ and CD $.$

$[5]$

$($iii$)$ Identify the member with maximum load, and suggest a section size that will limit the stress in this member to $50\frac{N}{m}{m}^2.$

$[1]$